Input validation error in PHP

1) Input validation error

EUVDB-ID: #VU45390

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-0752

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The extract function in PHP before 5.2.15 does not prevent use of the EXTR_OVERWRITE parameter to overwrite (1) the GLOBALS superglobal array and (2) the this variable, which allows context-dependent attackers to bypass intended access restrictions by modifying data structures that were not intended to depend on external input, a related issue to CVE-2005-2691 and CVE-2006-3758.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PHP: 1.0 - 5.2.13

External links

http://marc.info/?l=bugtraq&m=133469208622507&w=2
http://www.openwall.com/lists/oss-security/2010/12/13/4
http://www.php.net/archive/2010.php#id2010-12-10-1
http://www.php.net/ChangeLog-5.php
http://www.php.net/releases/5_2_15.php
http://exchange.xforce.ibmcloud.com/vulnerabilities/65432
http://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12016

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.