Dovecot was discovered to have an error when handling its index cache files. This error could be exploited by authenticated POP and IMAP users to cause a crash of the Dovecot server, or possibly to execute arbitrary code. Only servers using the non-default option “mmap_disable=yes” were vulnerable.
The problem can be corrected by updating your system to the following package versions:
28 November 2006
A security issue affects these releases of Ubuntu and its derivatives:
Dovecot was discovered to have an error when handling its index cache files. This error could be exploited by authenticated POP and IMAP users to cause a crash of the Dovecot server, or possibly to execute arbitrary code. Only servers using the non-default option “mmap_disable=yes” were vulnerable.
The problem can be corrected by updating your system to the following package versions:
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.
Vulmon