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Date: Wed, 22 May 2013 16:20:30 +0530
From: Huzaifa Sidhpurwala <>
CC: Agostino Sarubbo <>
Subject: Re: CVE request: dovecot : "APPEND" Parameters Processing
 Denial of Service Vulnerability

On 05/22/2013 12:28 AM, Agostino Sarubbo wrote:
> From the secunia advisory SA53492[1] :
> Description
> A vulnerability has been reported in Dovecot, which can be exploited by 
> malicious users to cause a DoS (Denial of Service).
> The vulnerability is caused due to an error within IMAP functionality when 
> processing the "APPEND" parameters and can be exploited to cause a hang.
> The vulnerability is reported in version 2.2.
> Solution
> Update to version 2.2.2.
> Provided and/or discovered by
> Reported by the vendor.
> Original Advisory
> Commit:
> [1]:

Note: I found a similar commit in dovecot-2.2 repo:

the commit message says " imap: Fixed assert-crash on invalid APPEND

I am not very familiar with the dovecot code, but taking a brief look
suggests that parsing APPEND in some way could result in hitting assert.

Huzaifa Sidhpurwala / Red Hat Security Response Team

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