USN-838-1: Dovecot vulnerabilities

Ubuntu Security Notice USN-838-1

28th September, 2009

dovecot vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software description

  • dovecot

Details

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. (CVE-2008-4577)

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. (CVE-2008-5301)

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. (CVE-2009-2632, CVE-2009-3235)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 9.04:
dovecot-common 1:1.1.11-0ubuntu4.1
Ubuntu 8.10:
dovecot-common 1:1.1.4-0ubuntu1.3
Ubuntu 8.04 LTS:
dovecot-common 1:1.0.10-1ubuntu5.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system upgrade is sufficient to effect the
necessary changes.

References

CVE-2008-4577, CVE-2008-5301, CVE-2009-2632, CVE-2009-3235