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Category:   Application (E-mail Server)  >   IMAP Toolkit (uw-imap) Vendors:   University of Washington
(Gentoo Issues Fix) UW IMAP CRAM-MD5 Authentication Flaw Lets Remote Users Access Arbitrary IMAP Accounts
SecurityTracker Alert ID:  1013069
SecurityTracker URL:  http://securitytracker.com/id/1013069
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Feb 3 2005
Impact:   User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2004b
Description:   A vulnerability was reported in the University of Washington IMAP server. A remote user can access e-mail accounts when the system uses a certain authentication mechanism.

US-CERT reported that Challenge-Response Authentication Mechanism with MD5 (CRAM-MD5) code contains a logic error that may allow a remote user to authenticate as any target user and access the target user's IMAP account.

CRAM-MD5 authentication is not a default configuration.

Impact:   A remote user can gain access to a target user's IMAP account.
Solution:   Gentoo has released a fix and indicates that al UW IMAP users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/uw-imap-2004b"

Vendor URL:  www.washington.edu/imap/ (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Jan 28 2005 UW IMAP CRAM-MD5 Authentication Flaw Lets Remote Users Access Arbitrary IMAP Accounts



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200502-02 ] UW IMAP: CRAM-MD5 authentication bypass


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Gentoo Linux Security Advisory                           GLSA 200502-02
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: UW IMAP: CRAM-MD5 authentication bypass
      Date: February 02, 2005
      Bugs: #79874
        ID: 200502-02

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Synopsis
========

UW IMAP contains a vulnerability in the code handling CRAM-MD5
authentication allowing authentication bypass.

Background
==========

UW IMAP is the University of Washington IMAP toolkit which includes
POP3 and IMAP daemons.

Affected packages
=================

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  net-mail/uw-imap      <= 2004a                           >= 2004b

Description
===========

A logic bug in the code handling CRAM-MD5 authentication incorrectly
specifies the condition for successful authentication.

Impact
======

An attacker could exploit this vulnerability to authenticate as any
mail user on a server with CRAM-MD5 authentication enabled.

Workaround
==========

Disable CRAM-MD5 authentication.

Resolution
==========

All UW IMAP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-mail/uw-imap-2004b"

References
==========

  [ 1 ] US-CERT VU#702777
        http://www.kb.cert.org/vuls/id/702777

Availability
============

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

  http://security.gentoo.org/glsa/glsa-200502-02.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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