TITLE:
Fetchmail Headerless Message Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA17891

VERIFY ADVISORY:
http://secunia.com/advisories/17891/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Fetchmail 6.x
http://secunia.com/product/370/

DESCRIPTION:
A vulnerability has been reported in Fetchmail, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a null pointer dereferencing error
when handling a message without email headers. This can be exploited
to crash Fetchmail when the upstream mail server sends a message
without headers.

Successful exploitation requires that Fetchmail is configured for
multidrop mode and retrieves emails from a malicious upstream mail
server.

The vulnerability has been reported in versions 6.2.5.4 and 6.3.0.
Prior versions may also be affected.

SOLUTION:
Update to the fixed version.
http://developer.berlios.de/project/showfiles.php?group_id=1824&release_id=8405

Fetchmail 6.3.x:
Update to version 6.3.1.

Fetchmail 6.2.x:
Update to version 6.2.5.5.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Daniel Drake and Sunil Shetye.

ORIGINAL ADVISORY:
http://fetchmail.berlios.de/fetchmail-SA-2005-03.txt

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