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Gentoo Linux Security Advisory                           GLSA 200507-21
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: fetchmail: Buffer Overflow
      Date: July 25, 2005
      Bugs: #99865
        ID: 200507-21

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Synopsis
=======
fetchmail is susceptible to a buffer overflow resulting in a Denial of
Service or arbitrary code execution.

Background
=========
fetchmail is a utility that retrieves and forwards mail from remote
systems using IMAP, POP, and other protocols.

Affected packages
================
    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  net-mail/fetchmail      < 6.2.5.2                      >= 6.2.5.2

Description
==========
fetchmail does not properly validate UIDs coming from a POP3 mail
server. The UID is placed in a fixed length buffer on the stack, which
can be overflown.

Impact
=====
Very long UIDs returned from a malicious or compromised POP3 server can
cause fetchmail to crash, resulting in a Denial of Service, or allow
arbitrary code to be placed on the stack.

Workaround
=========
There are no known workarounds at this time.

Resolution
=========
All fetchmail users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/fetchmail-6.2.5.2"

References
=========
  [ 1 ] Fetchmail Security Advisory
        https://www.berlios.de/software/fetchmail/
  [ 2 ] CAN-2005-2335
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2335

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200507-21

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org/.

License
======
Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.0/