#VU45227 Input validation error in PHP - CVE-2011-1092

Vulnerability identifier: #VU45227

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2011-1092

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Integer overflow in ext/shmop/shmop.c in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (crash) and possibly read sensitive memory via a large third argument to the shmop_read function.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 1.0, 2.0b10, 2.0, 3.0 - 3.0.18, 4.0 - 4.0.7, 4.1.0 - 4.1.2, 4.2.0 - 4.2.3, 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.4

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External links
https://bugs.php.net/bug.php?id=54193
https://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
https://marc.info/?l=bugtraq&m=133469208622507&w=2
https://securityreason.com/securityalert/8130
https://support.apple.com/kb/HT5002
https://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/shmop/shmop.c?r1=306939&r2=309018&pathrev=309018
https://www.exploit-db.com/exploits/16966
https://www.mandriva.com/security/advisories?name=MDVSA-2011:052
https://www.mandriva.com/security/advisories?name=MDVSA-2011:053
https://www.openwall.com/lists/oss-security/2011/03/08/11
https://www.openwall.com/lists/oss-security/2011/03/08/9
https://www.php.net/archive/2011.php
https://www.php.net/ChangeLog-5.php
https://www.php.net/releases/5_3_6.php
https://www.securityfocus.com/bid/46786
https://www.vupen.com/english/advisories/2011/0744
https://bugzilla.redhat.com/show_bug.cgi?id=683183
https://exchange.xforce.ibmcloud.com/vulnerabilities/65988

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.