(Gentoo Issues Fix) UW IMAP CRAM-MD5 Authentication Flaw Lets Remote Users Access Arbitrary IMAP Accounts
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SecurityTracker Alert ID: 1013069 |
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SecurityTracker URL: http://securitytracker.com/id/1013069
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Feb 3 2005
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Impact:
User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 2004b
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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.
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Impact:
A remote user can gain access to a target user's IMAP account.
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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"
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Vendor URL: www.washington.edu/imap/ (Links to External Site)
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Cause:
Authentication error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Wed, 2 Feb 2005 11:24:09 +0100
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
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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
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Disable CRAM-MD5 authentication.
Resolution
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All UW IMAP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/uw-imap-2004b"
References
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[ 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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