poppassd_pam Lets Remote Users Modify Arbitrary Passwords
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SecurityTracker Alert ID: 1012840
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SecurityTracker URL: http://securitytracker.com/id?1012840
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CVE Reference: CAN-2005-0002
(Links to External Site)
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Nessus Reference: 16139
(Links to External Site)
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Updated: Jan 13 2005
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Original Entry Date: Jan 12 2005
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Impact: Modification of authentication information, Root access via network, User access via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 1.0 and prior versions
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Description: A vulnerability was reported in poppassd_pam. A remote user can change the password of any target user, including the root user account.
Gentoo reported that poppassd_pam does not authenticate remote users prior to changing the system password for the remote user.
As a result, a remote user can change the system password of arbitrary POP users.
Gentoo Linux developer Marcus Hanwell is credited
with discovering this flaw.
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Impact: A remote user can change the system password of an arbitrary target user, including the root user account.
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Solution: Gentoo has issued a new package called poppassd_ceti to replace poppassd_pam. Gentoo indicates that all poppassd_pam users should
migrate to the new package called poppassd_ceti:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/poppassd_ceti-1.8.4"
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Vendor URL: www.gentoo.org/ (Links to External Site)
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Cause: Authentication error
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Underlying OS: Linux (Any)
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Reported By: Thierry Carrez <koon@gentoo.org>
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Message History:
None.
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Source Message Contents
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Date: Tue, 11 Jan 2005 20:57:17 +0100
From: Thierry Carrez <koon@gentoo.org>
Subject: [gentoo-announce] [ GLSA 200501-22 ] poppassd_pam: Unauthorized password changing
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Gentoo Linux Security Advisory GLSA 200501-22
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http://security.gentoo.org/
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Severity: High
Title: poppassd_pam: Unauthorized password changing
Date: January 11, 2005
Bugs: #75820
ID: 200501-22
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Synopsis
========
poppassd_pam allows anyone to change any user's password without
authenticating the user first.
Background
==========
poppassd_pam is a PAM-enabled server for changing system passwords that
can be used to change POP server passwords.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
net-mail/poppassd_ceti <= 1.0 >= 1.8.4
net-mail/poppassd_pam <= 1.0 Vulnerable!
-------------------------------------------------------------------
Description
===========
Gentoo Linux developer Marcus Hanwell discovered that poppassd_pam did
not check that the old password was valid before changing passwords.
Our investigation revealed that poppassd_pam did not call
pam_authenticate before calling pam_chauthtok.
Impact
======
A remote attacker could change the system password of any user,
including root. This leads to a complete compromise of the POP
accounts, and may also lead to a complete root compromise of the
affected server, if it also provides shell access authenticated using
system passwords.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All poppassd_pam users should migrate to the new package called
poppassd_ceti:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-mail/poppassd_ceti-1.8.4"
Note: Portage will automatically replace the poppassd_pam package by
the poppassd_ceti package.
References
==========
[ 1 ] CAN-2005-0002
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0002
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200501-22.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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