USN-1143-1: Dovecot vulnerability

2 June 2011

dovecot vulnerability

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

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS

Summary

An attacker could send a crafted email message that could disrupt email service.

Software Description

  • dovecot - IMAP and POP3 email server

Details

It was discovered that the message header parser in Dovecot did not properly handle ‘\0’ characters in header names. This could allow a remote attacker to cause a denial of service through a crafted email message by crashing the Dovecot daemon or corrupting mailboxes.

Update instructions

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

Ubuntu 11.04
dovecot-common - 1:1.2.15-3ubuntu2.1
Ubuntu 10.10
dovecot-common - 1:1.2.12-1ubuntu8.2
Ubuntu 10.04 LTS
dovecot-common - 1:1.2.9-1ubuntu6.4

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

In general, a standard system update will make all the necessary changes.

References