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TITLE:
Cyrus IMAP Server Sieve Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA36629

VERIFY ADVISORY:
http://secunia.com/advisories/36629/

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

The vulnerability is caused due to an error in the handling of Sieve
scripts when calculating the size of a string passed to "snprintf()"
and can be exploited to cause a stack-based buffer overflow.

Successful exploitation may allow execution of arbitrary code, but
requires user access and the ability to define Sieve scripts.

The vulnerability is reported in versions 2.2.13 and 2.3.14.

SOLUTION:
Fixed in the CVS repository.
https://bugzilla.andrew.cmu.edu/cgi-bin/cvsweb.cgi/src/sieve/script.c.diff?r1=1.62&r2=1.62.2.1&only_with_tag=cyrus-imapd-2_2-tail
https://bugzilla.andrew.cmu.edu/cgi-bin/cvsweb.cgi/src/sieve/script.c.diff?r1=1.67&r2=1.68

PROVIDED AND/OR DISCOVERED BY:
Reported in a Debian Security Advisory.

ORIGINAL ADVISORY:
https://lists.andrew.cmu.edu/pipermail/cyrus-cvs/2009-September/001253.html
https://lists.andrew.cmu.edu/pipermail/cyrus-cvs/2009-September/001254.html

OTHER REFERENCES:
http://www.us.debian.org/security/2009/dsa-1881

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