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Cyrus IMAPd NTTP Authentication Bypass

Cyrus IMAPd NTTP Authentication Bypass
Posted Oct 5, 2011
Authored by Stefan Cornelius | Site secunia.com

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 by an error in the authentication mechanism of the NNTP server. This can be exploited to bypass the authentication process and execute commands intended for authenticated users only by sending an "AUTHINFO USER" command without a following "AUTHINFO PASS" command. Versions 2.4.10 and 2.4.11 are affected.

tags | advisory
SHA-256 | a527d453cfb32475e8deb8f919bc978fc3f901cd5b277252506bccdd46d12b1f

Cyrus IMAPd NTTP Authentication Bypass

Change Mirror Download
====================================================================== 

Secunia Research 05/10/2011

- Cyrus IMAPd NTTP Authentication Bypass Vulnerability -

======================================================================
Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

======================================================================
1) Affected Software

* Cyrus IMAPd 2.4.10 and 2.4.11

NOTE: Prior versions may also be affected.

======================================================================
2) Severity

Rating: Moderately critical
Impact: Security bypass
Where: From remote

======================================================================
3) Vendor's Description of Software

"Cyrus is a highly scalable enterprise mail system designed for use
in enterprise environments of various sizes using standards based
technologies. Cyrus technologies scale from independent use in email
departments to a system centrally managed in a large enterprise.".

Product Link:
http://www.cyrusimap.org/

======================================================================
4) Description of Vulnerability

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 by an error in the authentication
mechanism of the NNTP server. This can be exploited to bypass the
authentication process and execute commands intended for
authenticated users only by sending an "AUTHINFO USER" command
without a following "AUTHINFO PASS" command.

======================================================================
5) Solution

Update to version 2.4.12.

======================================================================
6) Time Table

19/09/2011 - Vendor notified.
20/09/2011 - Vendor response.
05/10/2011 - Public disclosure.

======================================================================
7) Credits

Discovered by Stefan Cornelius, Secunia Research.

======================================================================
8) References

The Common Vulnerabilities and Exposures (CVE) project has not yet
assigned a CVE identifier for the vulnerability.

======================================================================
9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://secunia.com/advisories/business_solutions/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/advisories/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:

http://secunia.com/secunia_research/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/corporate/jobs/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/advisories/mailing_lists/

======================================================================
10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2011-68/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

======================================================================
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