Ubuntu Security Notice USN-838-1 - It was discovered that the ACL plugin in Dovecot would incorrectly handle negative access rights. An attacker could exploit this flaw to access the Dovecot server, bypassing the intended access restrictions. This only affected Ubuntu 8.04 LTS. It was discovered that the ManageSieve service in Dovecot incorrectly handled ".." in script names. A remote attacker could exploit this to read and modify arbitrary sieve files on the server. This only affected Ubuntu 8.10. It was discovered that the Sieve plugin in Dovecot incorrectly handled certain sieve scripts. An authenticated user could exploit this with a crafted sieve script to cause a denial of service or possibly execute arbitrary code.
5fd61a6a6d760fcf2bd0a9d66e294c6897bc30e1df8871482b661db6a9b066a1Gentoo Linux Security Advisory GLSA 200812-16 - Multiple vulnerabilities were found in the Dovecot mailserver. Versions less than 1.1.7-r1 are affected.
469caccee3552d8a95b0ef10e4b692ab98806818590798925e276bd7f6bb66a0Mandriva Linux Security Advisory 2008-232 - The ACL plugin in dovecot prior to version 1.1.4 treated negative access rights as though they were positive access rights, which allowed attackers to bypass intended access restrictions. The ACL plugin in dovecot prior to version 1.1.6 allowed attackers to bypass intended access restrictions by using the 'k' right to create unauthorized 'parent/child/child' mailboxes.
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