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softalk-dos.txt

softalk-dos.txt
Posted Sep 3, 2008
Authored by Joao Antunes

The Softalk IMAP server version 8.5.1 is susceptible to a denial of service vulnerability.

tags | advisory, denial of service, imap
SHA-256 | 5611130875b5d83f2966976bf8bc3e007c779dad975edd95df7f87e34774cabc

softalk-dos.txt

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----------------------------------------
Synopsis
----------------------------------------
Softalk IMAP Server 8.5.1 is vulnerable to denial-of-service (DoS)
attacks.
The IMAP server crashes when processing an APPEND command with a
strange parameter (see details bellow). Other commands may also
trigger the same behavior.

Product: Softalk Mail Server
Version: 8.5.1.431 and probably the older versions
Vendor: Softalk (www.softalkltd.com)
Type: Denial-of-service
Risk: service disruption
Remote: Yes
Discovered by: João Antunes (AJECT -- Attack Injection Tool) on 05/Jun/
2008
Exploit: Not Available
Solution: Not Available
Status: Developers were contacted and should be releasing a corrected
version soon (8.5.2 beta 2)

----------------------------------------
Vulnerability Description
----------------------------------------
The vulnerability can be triggered by sending the following messages
to the imap server:
A001 LOGIN user password
A01 APPEND Ax5000 (UIDNEXT MESSAGES) (…) Ax5000 (UIDNEXT MESSAGES)

For the sake of legibility, the APPEND command was presented above in
a condensed form.
The "(...)" means that the parameters should be repeated several times
in the same command (e.g., ten times). Successful exploitation results
in a remote denial of service.
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