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                     Secunia Research 05/10/2011

      - Cyrus IMAPd NTTP Authentication Bypass Vulnerability -

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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

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1) Affected Software 

* Cyrus IMAPd 2.4.10 and 2.4.11

NOTE: Prior versions may also be affected.

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2) Severity 

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

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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/

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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.

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5) Solution 

Update to version 2.4.12.

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6) Time Table 

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

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7) Credits 

Discovered by Stefan Cornelius, Secunia Research.

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8) References

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

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
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relevant to their specific system configuration:

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

Secunia also provides a publicly accessible and comprehensive advisory
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Secunia believes that it is important to support the community and to
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Secunia regularly hires new skilled team members. Check the URL below
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http://secunia.com/corporate/jobs/

Secunia offers a FREE mailing list called Secunia Security Advisories:

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

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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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