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Last updated: 5/30/2016 7:52:28 AM

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Vulnerability Summary for CVE-2011-1926

Original release date: 05/23/2011
Last revised: 09/06/2011


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.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 5.1 MEDIUM
Impact Subscore: 6.4
Exploitability Subscore: 4.9
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

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External Source: MANDRIVA
Name: MDVSA-2011:100
External Source: SECTRACK
Name: 1025625
External Source: CONFIRM
Name: http://bugzilla.cyrusimap.org/show_bug.cgi?id=3424
Type: Patch Information
External Source: CONFIRM
Name: http://bugzilla.cyrusimap.org/show_bug.cgi?id=3423
Type: Patch Information
External Source: CONFIRM
Name: http://www.cyrusimap.org/docs/cyrus-imapd/2.4.7/changes.php
External Source: REDHAT
Name: RHSA-2011:0859
External Source: DEBIAN
Name: DSA-2242
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=705288
Type: Patch Information
External Source: DEBIAN
Name: DSA-2258
External Source: FEDORA
Name: FEDORA-2011-7217
External Source: MLIST
Name: [oss-security] 20110517 CVE Request -- Cyrus-IMAP STARTTLS issue -- [was: Re: pure-ftpd STARTTLS command injection / new CVE?]
Type: Patch Information
External Source: MLIST
Name: [oss-security] 20110517 Re: CVE Request -- Cyrus-IMAP STARTTLS issue -- [was: Re: pure-ftpd STARTTLS command injection / new CVE?]
Type: Patch Information
External Source: XF
Name: cyrus-starttls-command-exec(67867)
US-CERT Vulnerability Note: CERT-VN
Name: VU#555316
External Source: CONFIRM
Name: http://git.cyrusimap.org/cyrus-imapd/patch/?id=523a91a5e86c8b9a27a138f04a3e3f2d8786f162
Type: Patch Information
External Source: FEDORA
Name: FEDORA-2011-7193

Technical Details

Vulnerability Type (View All)
  • Permissions, Privileges, and Access Control (CWE-264)