[ GLSA 200507-21 ] fetchmail: Buffer Overflow

From: Sune Kloppenborg Jeppesen (jaervosz_at_gentoo.org)
Date: 07/25/05

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    To: gentoo-announce@gentoo.org
Date: Mon, 25 Jul 2005 19:58:20 +0200

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    Gentoo Linux Security Advisory GLSA 200507-21
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                                                http://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
            http://fetchmail.berlios.de/fetchmail-SA-2005-01.txt
      [ 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:

      http://security.gentoo.org/glsa/glsa-200507-21.xml

    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
    http://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.

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

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