Permissions, Privileges, and Access Controls in Cyrus IMAP Server - CVE-2011-1926

Detailed vulnerability description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The STARTTLS implementation in Cyrus IMAP Server before 2.4.7 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.

How to mitigate CVE-2011-1926

Sources

• http://bugzilla.cyrusimap.org/show_bug.cgi?id=3423
• http://bugzilla.cyrusimap.org/show_bug.cgi?id=3424
• http://git.cyrusimap.org/cyrus-imapd/patch/?id=523a91a5e86c8b9a27a138f04a3e3f2d8786f162
• http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061374.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061415.html
• http://openwall.com/lists/oss-security/2011/05/17/15
• http://openwall.com/lists/oss-security/2011/05/17/2
• http://secunia.com/advisories/44670
• http://secunia.com/advisories/44876
• http://secunia.com/advisories/44913
• http://secunia.com/advisories/44928
• http://www.cyrusimap.org/docs/cyrus-imapd/2.4.7/changes.php
• http://www.debian.org/security/2011/dsa-2242
• http://www.debian.org/security/2011/dsa-2258
• http://www.kb.cert.org/vuls/id/555316
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:100
• http://www.redhat.com/support/errata/RHSA-2011-0859.html
• http://www.securitytracker.com/id?1025625
• https://bugzilla.redhat.com/show_bug.cgi?id=705288
• https://exchange.xforce.ibmcloud.com/vulnerabilities/67867