MantisBT before 1.2.18 uses the public_key parameter value as the key to the CAPTCHA answer, which allows remote attackers to bypass the CAPTCHA protection mechanism by leveraging knowledge of a CAPTCHA answer for a public_key parameter value, as demonstrated by E4652 for the public_key value 0.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9117
Reference (s):
- BID:71321
- URL: http://www.securityfocus.com/bid/71321
- https://github.com/mantisbt/mantisbt/commit/7bb78e45
- https://www.mantisbt.org/bugs/view.php?id=17811
- DEBIAN:DSA-3120