Remote PHP code execution in Joomla!

1) Remote PHP code execution

EUVDB-ID: #VU157

Risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2015-8562

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary PHP code on the target system.

The vulnerability exists due to insufficient filtration of HTTP User-Agent header and filter-search HTTP POST parameter before storing them into database. A remote unauthenticated attacker can permanently inject and execute arbitrary PHP code on the target system with privileges of the web server.

Successful exploitation of this vulnerability will allow a remote attacker to gain complete control over the vulnerable web application and execute arbitrary PHP code on the target system.

Note: this is a zero-day vulnerability and it is being exploited in the wild.

Mitigation

Update your Joomla! installation to version 3.4.6.

Vulnerable software versions

Joomla!: 1.5 - 3.4.5

External links

http://developer.joomla.org/security-centre/630-20151214-core-remote-code-execution-vulnerability.h...
http://www.cybersecurity-help.cz/blog/30.html

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?

Yes. This vulnerability is being exploited in the wild.