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TITLE:
Postfix SMTP SASL Authentication Context Data Reuse Vulnerability

SECUNIA ADVISORY ID:
SA44500

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44500/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44500

RELEASE DATE:
2011-05-11

DISCUSS ADVISORY:
http://secunia.com/advisories/44500/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
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 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/44500/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=44500

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in Postfix, which can be exploited
by malicious people to cause a DoS (Denial of Service) or potentially
compromise a vulnerable system.

The vulnerability is caused due to the Cyrus SASL library in the SMTP
server not releasing session context data structures when processing
certain authentication methods (e.g. CRAM-MD5 or DIGEST-MD5). This
can be exploited to access or manipulate context dependent memory by
aborting an authentication session and starting a new one.

Successful exploitation requires that Cyrus SASL authentication is
enabled (e.g. "smtpd_sasl_auth_enable = yes") and supports methods
other than PLAIN or LOGIN.

NOTE: Successful exploitation for arbitrary code execution has not
been proven, but cannot be ruled out based on current vulnerability
details. This section will be updated when more information becomes
available.

The vulnerability is reported in versions prior to 2.5.13, 2.6.10,
2.7.4, and 2.8.3.

SOLUTION:
Update to version 2.5.13, 2.6.10, 2.7.4, or 2.8.3.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Thomas Jarosch, Intra2net AG.

ORIGINAL ADVISORY:
http://www.postfix.org/CVE-2011-1720.html
http://thread.gmane.org/gmane.mail.postfix.announce/127

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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