Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 1

Arbitrary file upload in Joomla!
CVE-2013-5576

Arbitrary file upload

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

The weakness exists due to improper validation of file extensions by the media.php and index.php scripts. A remote attacker can create a specially crafted HTTP request, upload a malicious PHP script and execute arbitrary PHP code.

Successful exploitation of the vulnerability results in arbitrary PHP code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.
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The weakness was disclosed 08/01/2013 by Jens Hinrichsen.

Software: Joomla!

The weakness was disclosed 08/01/2013 by Jens Hinrichsen.

Links:

https://developer.joomla.org/security/563-20130801-core-unauthorised-uploads.html
http://www.cso.com.au/article/523528/joomla_patches_file_manager_vulnerability_responsible_hijacked_...
http://www.kb.cert.org/vuls/id/639620
http://niiconsulting.com/checkmate/2013/08/critical-joomla-file-upload-vulnerability/
https://blog.sucuri.net/2013/08/joomla-media-manager-attacks-in-the-wild.html
http://holisticinfosec.blogspot.com/2013/10/joomla-vulnerabilities-responsible.htm

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About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.