Vulnerability identifier: #VU45307

Vulnerability risk: Medium

CVSSv3.1: 5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:U/RC:C]

CVE-ID: CVE-2011-0420

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 context-dependent attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (crash) via an invalid size argument, which triggers a NULL pointer dereference.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

PHP: 5.3.5

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External links
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
http://securityreason.com/achievement_securityalert/94
http://securityreason.com/securityalert/8087
http://support.apple.com/kb/HT5002
http://svn.php.net/viewvc/php/php-src/trunk/ext/intl/grapheme/grapheme_string.c?r1=306449&r2=306448&pathrev=306449
http://www.debian.org/security/2011/dsa-2266
http://www.exploit-db.com/exploits/16182
http://www.kb.cert.org/vuls/id/210829
http://www.securityfocus.com/archive/1/516504/100/0/threaded
http://www.securityfocus.com/archive/1/516518/100/0/threaded
http://www.securityfocus.com/bid/46429
http://exchange.xforce.ibmcloud.com/vulnerabilities/65437

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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.