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Bug #73361 Out-of-bounds reads issue of php 5.6.27
Submitted: 2016-10-21 00:52 UTC Modified: 2016-11-06 04:22 UTC
From: 271193918 at qq dot com Assigned: cmb (profile)
Status: No Feedback Package: Scripting Engine problem
PHP Version: 5.6.27 OS: Ubuntu 16.04 x86
Private report: No CVE-ID: None
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 [2016-10-21 00:52 UTC] 271193918 at qq dot com 
Description:
------------
A malformed input to the function exif_read_data() can cause an out of bounds heap memory read access. 

This was found with American Fuzzy Lop.

To test run the cli script on the poc:

USE_ZEND_ALLOC=0 valgrind --tool=memcheck --leak-check=full --show-leak-kinds=all --track-origins=yes -v ./php -c exif_read_data.php ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2



Test script:
---------------
exif_read_data.php

<?php
exif_read_data($argv[1]);
?>



Expected result:
----------------
Part of test logs by Valgrind as follows and All test files are attached.

test@test:~/Desktop/php_test/php-5.6.27/sapi/cli$ uname -a
Linux test 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:34:49 UTC 2016 i686 i686 i686 GNU/Linux

......

==1160== HEAP SUMMARY:
==1160==     in use at exit: 19,220 bytes in 10 blocks
==1160==   total heap usage: 27,187 allocs, 27,177 frees, 233,036,264 bytes allocated
==1160== 
==1160== Searching for pointers to 10 not-freed blocks
==1160== Checked 344,576 bytes
==1160== 
==1160== 12 bytes in 1 blocks are still reachable in loss record 1 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43460BF: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==1160==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==1160== 
==1160== 12 bytes in 1 blocks are still reachable in loss record 2 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C2DE9: lh_insert (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43460EC: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==1160== 
==1160== 16 bytes in 1 blocks are still reachable in loss record 3 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C21BF: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42DBE38: ??? (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x42DE083: SSL_COMP_get_compression_methods (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x42E3745: SSL_library_init (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6CEB: zm_startup_openssl (openssl.c:1144)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==1160==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==1160== 
==1160== 16 bytes in 1 blocks are still reachable in loss record 4 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C21BF: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C2245: sk_new_null (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43460D6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160== 
==1160== 20 bytes in 1 blocks are still reachable in loss record 5 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C21A6: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42DBE38: ??? (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x42DE083: SSL_COMP_get_compression_methods (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x42E3745: SSL_library_init (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6CEB: zm_startup_openssl (openssl.c:1144)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==1160==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==1160== 
==1160== 20 bytes in 1 blocks are still reachable in loss record 6 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C21A6: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C2245: sk_new_null (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43460D6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160== 
==1160== 20 bytes in 1 blocks are still reachable in loss record 7 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434622A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==1160==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==1160==    by 0x839C3ED: php_module_startup (main.c:2323)
==1160== 
==1160== 64 bytes in 1 blocks are still reachable in loss record 8 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C2ACF: lh_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4345FF5: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43460A4: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160== 
==1160== 96 bytes in 1 blocks are still reachable in loss record 9 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43C2AB5: lh_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4345FF5: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x43460A4: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==1160==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==1160==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==1160==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==1160==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==1160== 
==1160== 18,944 bytes in 1 blocks are still reachable in loss record 10 of 10
==1160==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==1160==    by 0x61A95BA: ??? (in /usr/lib/i386-linux-gnu/libstdc++.so.6.0.21)
==1160==    by 0x400F364: call_init.part.0 (dl-init.c:72)
==1160==    by 0x400F48D: call_init (dl-init.c:30)
==1160==    by 0x400F48D: _dl_init (dl-init.c:120)
==1160==    by 0x4000AFE: ??? (in /lib/i386-linux-gnu/ld-2.23.so)
==1160== 
==1160== LEAK SUMMARY:
==1160==    definitely lost: 0 bytes in 0 blocks
==1160==    indirectly lost: 0 bytes in 0 blocks
==1160==      possibly lost: 0 bytes in 0 blocks
==1160==    still reachable: 19,220 bytes in 10 blocks
==1160==         suppressed: 0 bytes in 0 blocks
==1160== 
==1160== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==1160== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

Actual result:
--------------
test@test:~/Desktop/php_test/php-5.6.27/sapi/cli$ gdb -q --args ./php -c exif_read_data.php ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2
Reading symbols from ./php...done.
(gdb) r

......

Fatal error: Allowed memory size of 134217728 bytes exhausted at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_vm_execute.h:12902 (tried to allocate 27751964 bytes) in /home/test/Desktop/php_test/php-5.6.27/sapi/cli/crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2 on line 65

Program received signal SIGSEGV, Segmentation fault.
0x084153a1 in _zval_dtor_func (zvalue=0xb59cfd3c, __zend_filename=0x891c7cc "/home/test/Desktop/php_test/php-5.6.27/Zend/zend_execute.h", 
    __zend_lineno=79) at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_variables.c:36
36				CHECK_ZVAL_STRING_REL(zvalue);
(gdb) bt
#0  0x084153a1 in _zval_dtor_func (zvalue=0xb59cfd3c, __zend_filename=0x891c7cc "/home/test/Desktop/php_test/php-5.6.27/Zend/zend_execute.h", 
    __zend_lineno=79) at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_variables.c:36
#1  0x08404c3e in _zval_dtor (zvalue=0xb59cfd3c, __zend_filename=0x891c7cc "/home/test/Desktop/php_test/php-5.6.27/Zend/zend_execute.h", 
    __zend_lineno=79) at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_variables.h:35
#2  0x08404cd1 in i_zval_ptr_dtor (zval_ptr=0xb59cfd3c, __zend_filename=0x891e99c "/home/test/Desktop/php_test/php-5.6.27/Zend/zend_variables.c", 
    __zend_lineno=188) at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_execute.h:79
#3  0x08405a3a in _zval_ptr_dtor (zval_ptr=0xb5d1b43c, __zend_filename=0x891e99c "/home/test/Desktop/php_test/php-5.6.27/Zend/zend_variables.c", 
    __zend_lineno=188) at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_execute_API.c:424
#4  0x084157bf in _zval_ptr_dtor_wrapper (zval_ptr=0xb5d1b43c) at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_variables.c:188
#5  0x08425634 in i_zend_hash_bucket_delete (ht=0x89ba6fc <executor_globals+188>, p=0xb5d1b430)
    at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_hash.c:182
#6  0x084256e4 in zend_hash_bucket_delete (ht=0x89ba6fc <executor_globals+188>, p=0xb5d1b430)
    at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_hash.c:192
#7  0x08426ed8 in zend_hash_graceful_reverse_destroy (ht=0x89ba6fc <executor_globals+188>)
    at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_hash.c:613
#8  0x084054d3 in shutdown_executor () at /home/test/Desktop/php_test/php-5.6.27/Zend/zend_execute_API.c:244
#9  0x08417423 in zend_deactivate () at /home/test/Desktop/php_test/php-5.6.27/Zend/zend.c:960
#10 0x0839ba36 in php_request_shutdown (dummy=0x0) at /home/test/Desktop/php_test/php-5.6.27/main/main.c:1899
#11 0x084b3943 in do_cli (argc=4, argv=0x89c1ac0) at /home/test/Desktop/php_test/php-5.6.27/sapi/cli/php_cli.c:1181
#12 0x084b4064 in main (argc=4, argv=0x89c1ac0) at /home/test/Desktop/php_test/php-5.6.27/sapi/cli/php_cli.c:1382
(gdb)

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AllCommentsChangesGit/SVN commitsRelated reports
 [2016-10-24 05:24 UTC] stas@php.net
-Status: Open +Status: Feedback
 [2016-10-24 05:24 UTC] stas@php.net 
Could you please provide the (link to) image you were using in your test?
 [2016-10-24 05:40 UTC] 271193918 at qq dot com
-Status: Feedback +Status: Open
 [2016-10-24 05:40 UTC] 271193918 at qq dot com 
The link to image is:

https://mega.nz/#!AxxAzCwZ!Sx6BQTyzZupL2sCeyYLK628sJChx6eN8D754zh0Xh00
 [2016-10-24 05:40 UTC] stas@php.net
-Status: Open +Status: Feedback
 [2016-10-24 05:40 UTC] stas@php.net 
I tried the file attached to the email to the list and failed to reproduce any issue. Also, the backtrace looks very weird - looks like the error is destroying some object but the code doesn't create anything except exif_read_data which didn't produce any errors with valgrind. So I'm afraid I'll need a bit more info to proceed with this.
 [2016-10-24 06:13 UTC] 271193918 at qq dot com
-Status: Feedback +Status: Open
 [2016-10-24 06:13 UTC] 271193918 at qq dot com 
Steps to reproduce:

sudo apt-get install autoconf build-essential openssl libssl-dev make curl libcurl4-gnutls-dev libjpeg-dev libpng-dev libmcrypt-dev libxml2-dev libxml2 libreadline6 libreadline6-dev sqlite3

Compile source code of php 5.6.27 without Asan:

CC=gcc CXX=g++ ./configure --enable-exif --enable-debug --disable-cgi --with-openssl

make -j32

test@test:~/Desktop/php-5.6.27/sapi/cli$ ./php -v
PHP 5.6.27 (cli) (built: Oct 24 2016 13:56:53) (DEBUG)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies


USE_ZEND_ALLOC=0 valgrind --tool=memcheck --leak-check=full --show-leak-kinds=all --track-origins=yes -v ./php -c ./crashes/exif_read_data.php ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2

test@test:~/Desktop/php-5.6.27/sapi/cli$ USE_ZEND_ALLOC=0 valgrind --tool=memcheck --leak-check=full --show-leak-kinds=all --track-origins=yes -v ./php -c ./crashes/exif_read_data.php ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2

==18251== HEAP SUMMARY:
==18251==     in use at exit: 19,220 bytes in 10 blocks
==18251==   total heap usage: 27,194 allocs, 27,184 frees, 233,024,408 bytes allocated
==18251== 
==18251== Searching for pointers to 10 not-freed blocks
==18251== Checked 344,576 bytes
==18251== 
==18251== 12 bytes in 1 blocks are still reachable in loss record 1 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43460BF: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==18251==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==18251== 
==18251== 12 bytes in 1 blocks are still reachable in loss record 2 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C2DE9: lh_insert (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43460EC: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==18251== 
==18251== 16 bytes in 1 blocks are still reachable in loss record 3 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C21BF: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42DBE38: ??? (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x42DE083: SSL_COMP_get_compression_methods (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x42E3745: SSL_library_init (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6CEB: zm_startup_openssl (openssl.c:1144)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==18251==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==18251== 
==18251== 16 bytes in 1 blocks are still reachable in loss record 4 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C21BF: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C2245: sk_new_null (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43460D6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251== 
==18251== 20 bytes in 1 blocks are still reachable in loss record 5 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C21A6: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42DBE38: ??? (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x42DE083: SSL_COMP_get_compression_methods (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x42E3745: SSL_library_init (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6CEB: zm_startup_openssl (openssl.c:1144)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==18251==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==18251== 
==18251== 20 bytes in 1 blocks are still reachable in loss record 6 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C21A6: sk_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C2245: sk_new_null (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43460D6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251== 
==18251== 20 bytes in 1 blocks are still reachable in loss record 7 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434622A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251==    by 0x8426FA3: zend_hash_apply (zend_hash.c:641)
==18251==    by 0x841E3FC: zend_startup_modules (zend_API.c:1930)
==18251==    by 0x839C3ED: php_module_startup (main.c:2323)
==18251== 
==18251== 64 bytes in 1 blocks are still reachable in loss record 8 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C2ACF: lh_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4345FF5: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43460A4: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251== 
==18251== 96 bytes in 1 blocks are still reachable in loss record 9 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x43444B6: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4344A8E: CRYPTO_malloc (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43C2AB5: lh_new (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4345FF5: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x43460A4: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x434620A: ??? (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x4346486: CRYPTO_get_ex_new_index (in /lib/i386-linux-gnu/libcrypto.so.1.0.0)
==18251==    by 0x42D6BE9: SSL_get_ex_new_index (in /lib/i386-linux-gnu/libssl.so.1.0.0)
==18251==    by 0x80B6D14: zm_startup_openssl (openssl.c:1153)
==18251==    by 0x841DF6A: zend_startup_module_ex (zend_API.c:1797)
==18251==    by 0x841DFCF: zend_startup_module_int (zend_API.c:1810)
==18251== 
==18251== 18,944 bytes in 1 blocks are still reachable in loss record 10 of 10
==18251==    at 0x402D1AE: malloc (vg_replace_malloc.c:299)
==18251==    by 0x61A95BA: ??? (in /usr/lib/i386-linux-gnu/libstdc++.so.6.0.21)
==18251==    by 0x400F364: call_init.part.0 (dl-init.c:72)
==18251==    by 0x400F48D: call_init (dl-init.c:30)
==18251==    by 0x400F48D: _dl_init (dl-init.c:120)
==18251==    by 0x4000AFE: ??? (in /lib/i386-linux-gnu/ld-2.23.so)
==18251== 
==18251== LEAK SUMMARY:
==18251==    definitely lost: 0 bytes in 0 blocks
==18251==    indirectly lost: 0 bytes in 0 blocks
==18251==      possibly lost: 0 bytes in 0 blocks
==18251==    still reachable: 19,220 bytes in 10 blocks
==18251==         suppressed: 0 bytes in 0 blocks
==18251== 
==18251== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==18251== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
 [2016-10-24 06:22 UTC] 271193918 at qq dot com 
If compile php 5.6.27 with Asan:

run without USE_ZEND_ALLOC=0 , test log as follows:

./php -c ./crashes/exif_read_data.php ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2

Fatal error: Allowed memory size of 134217728 bytes exhausted at /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_vm_execute.h:12902 (tried to allocate 27751964 bytes) in /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/sapi/cli/crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2 on line 65
ASAN:SIGSEGV
=================================================================
==18377==ERROR: AddressSanitizer: SEGV on unknown address 0xa70bce4b (pc 0x08b06f17 bp 0xbfbf2b98 sp 0xbfbf2b70 T0)
    #0 0x8b06f16 in _zval_dtor_func /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_variables.c:36
    #1 0x8aca1af in _zval_dtor /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_variables.h:35
    #2 0x8aca2bd in i_zval_ptr_dtor /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_execute.h:79
    #3 0x8acd46f in _zval_ptr_dtor /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_execute_API.c:424
    #4 0x8b07ce6 in _zval_ptr_dtor_wrapper /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_variables.c:188
    #5 0x8b40672 in i_zend_hash_bucket_delete /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_hash.c:182
    #6 0x8b4082e in zend_hash_bucket_delete /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_hash.c:192
    #7 0x8b4639a in zend_hash_graceful_reverse_destroy /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_hash.c:613
    #8 0x8acc193 in shutdown_executor /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_execute_API.c:244
    #9 0x8b0dc11 in zend_deactivate /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend.c:960
    #10 0x89a6b76 in php_request_shutdown /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/main/main.c:1899
    #11 0x8d6e3d9 in do_cli /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/sapi/cli/php_cli.c:1181
    #12 0x8d6f0bd in main /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/sapi/cli/php_cli.c:1382
    #13 0xb6ba3636 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x18636)
    #14 0x8067730  (/home/test/Desktop/php_test/php-5.6.27-gcc-Asan/sapi/cli/php+0x8067730)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/test/Desktop/php_test/php-5.6.27-gcc-Asan/Zend/zend_variables.c:36 _zval_dtor_func
==18377==ABORTING
 [2016-10-24 06:24 UTC] stas@php.net
-Status: Open +Status: Feedback
 [2016-10-24 06:24 UTC] stas@php.net 
I don't see any problem in the valgrind report what exactly are you reproducing? 

Also, could you provide a link to the file: ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2
 [2016-10-24 06:26 UTC] stas@php.net 
Wait, I just noticed. Why you use php -c option? This makes php read exif_read_data.php as config file and ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2 as a script. That's not how it's usually supposed to work.
 [2016-10-24 06:26 UTC] stas@php.net
-Status: Feedback +Status: Open -Type: Security +Type: Bug
 [2016-10-24 06:26 UTC] stas@php.net 
Maybe a weird parser bug, certainly not a security issue - nobody runs binary junk as PHP script.
 [2016-10-25 15:16 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2016-10-25 15:16 UTC] cmb@php.net 
To be able to debug this issue we need a copy of
./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2
 [2016-10-26 00:57 UTC] 271193918 at qq dot com
-Status: Feedback +Status: Assigned
 [2016-10-26 00:57 UTC] 271193918 at qq dot com 
The link to image id_000194,sig_11,src_024221+025505,op_splice,rep_2 is:

https://mega.nz/#!AxxAzCwZ!Sx6BQTyzZupL2sCeyYLK628sJChx6eN8D754zh0Xh00
 [2016-10-26 01:35 UTC] yohgaki@php.net 
This may be not related directly to this issue, but current exif code does not validate Unicode strings properly.

2634             /* XXX this will fail again if encoding_converter returns on error something different than SIZE_MAX   */
2635             if (!to || !from || zend_multibyte_encoding_converter(
2636                     (unsigned char**)pszInfoPtr,
2637                     &len,
2638                     (unsigned char*)szValuePtr,
2639                     ByteCount,
2640                     to,
2641                     from) == (size_t)-1) {
2642                 len = exif_process_string_raw(pszInfoPtr, szValuePtr, ByteCount);

This doesn't seem good. We are better to return nothing when encoding is broken, just like htmlspecialchars()/htmlentities().

@cmd Could you handle this issue. Just returning len=0 seems to work at glance.

If user insist to get broken data, we may provide function or ini option.
 [2016-10-26 07:29 UTC] cmb@php.net 
> […], but current exif code does not validate Unicode strings
> properly.

The issue regarding zend_multibyte_encoding_converter()
is not related to this ticket, which is not about Exif at all. I
don't have the time to have a closer look at the
zend_multibyte_encoding_converter() issue, but according to PR
#293[1] it may not (yet) be an issue at all. Anyhow, this issue
should be discussed elsewhere. :-)

> The link to image
> id_000194,sig_11,src_024221+025505,op_splice,rep_2 is:

Thanks. However, I can't see how this file is relevant. I want to
reproduce the OOB read when running:

php -c exif_read_data.php ./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2

The script exif_read_data.php is given in this ticket, but where
is
./crashes/fuzzer01/id_000194,sig_11,src_024221+025505,op_splice,rep_2?

[1] <https://github.com/php/php-src/pull/293>
 [2016-10-26 07:29 UTC] cmb@php.net
-Status: Assigned +Status: Feedback
 [2016-11-06 04:22 UTC] php-bugs at lists dot php dot net 
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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