Mandriva Linux Security Advisory 2009-242 – Multiple stack-based buffer overflows in the Sieve plugin in Dovecot 1.0 before 1.0.4 and 1.1 before 1.1.7, as derived from Cyrus libsieve, allow context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted SIEVE script, as demonstrated by forwarding an e-mail message to a large number of recipients, a different vulnerability than CVE-2009-2632. This update provides a solution to this vulnerability.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81544/MDVSA-2009-242.txt
Source: https://packetstormsecurity.com/files/81544/Mandriva-Linux-Security-Advisory-2009-242.html