Vulnerability identifier: #VU40516

Vulnerability risk: Medium

CVSSv3.1: 6.9 [AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2015-6833

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the PharData class in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12. A remote authenticated attacker can send a specially crafted HTTP request and remote attackers to write to arbitrary files via a . (dot dot) in a ZIP archive entry that is mishandled during an extractTo call.

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

Vulnerable software versions

PHP: 5.5.0 - 5.5.27, 5.6.0 - 5.6.11

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External links
http://www.debian.org/security/2015/dsa-3344
http://www.openwall.com/lists/oss-security/2015/08/19/3
http://www.php.net/ChangeLog-5.php
http://bugs.php.net/bug.php?id=70019
http://security.gentoo.org/glsa/201606-10

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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.