Secunia Research has discovered a vulnerability in Cyrus IMAPd, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to an error within the authentication mechanism of the NNTP server, which can be exploited to bypass the authentication process and execute commands intended for authenticated users by sending an "AUTHINFO USER" command without a following "AUTHINFO PASS" command.
The vulnerability is confirmed in version 2.4.10 and 2.4.11. Prior versions may also be affected.
Solution: Apply patch or update to version 2.4.12.
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Subject: Cyrus IMAPd NNTP Authentication Bypass Logic Error Vulnerability
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