(Gentoo Issues Fix) Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1026732 |
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SecurityTracker URL: http://securitytracker.com/id/1026732
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CVE Reference:
CVE-2011-4862
(Links to External Site)
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Date: Feb 23 2012
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
A vulnerability was reported in Kerberos. A remote user can execute arbitrary code on the target system.
A remote user can supply a specially crafted encryption key to trigger a buffer overflow and execute arbitrary code on the target system. The code will run with the privileges of the telnet daemon (typically root privileges).
Versions prior to krb5-1.8 and all versions of krb5-appl are affected.
This vulnerability is being actively exploited.
[Editor's note: This vulnerability was previously reported in Alert ID 1026460 as also affecting FreeBSD telnetd.]
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Impact:
A remote user can execute arbitrary code on the target system.
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Solution:
Gentoo has issued a fix for Heimdal.
The Gentoo advisory is available at:
http://security.gentoo.org/glsa/glsa-201202-05.xml
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Vendor URL: web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt (Links to External Site)
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Cause:
Boundary 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: Thu, 23 Feb 2012 05:38:04 +0000
Subject: GLSA
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Gentoo Linux Security Advisory GLSA 201202-05
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http://security.gentoo.org/
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Severity: High
Title: Heimdal: Arbitrary code execution
Date: February 22, 2012
Bugs: #396105
ID: 201202-05
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Synopsis
========
A boundary error in Heimdal could result in execution of arbitrary
code.
Background
==========
Heimdal is a free implementation of Kerberos 5.
Affected packages
=================
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Package / Vulnerable / Unaffected
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1 app-crypt/heimdal < 1.5.1-r1 >= 1.5.1-r1
Description
===========
A boundary error in the "encrypt_keyid()" function in
appl/telnet/libtelnet/encrypt.c of the telnet daemon and client could
cause a buffer overflow.
Impact
======
An unauthenticated remote attacker may be able to execute arbitrary
code with the privileges of the user running the telnet daemon or
client, or cause Denial of Service.
Workaround
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There is no known workaround at this time.
Resolution
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All Heimdal users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/heimdal-1.5.1-r1"
References
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[ 1 ] CVE-2011-4862
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4862
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-201202-05.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@g.o or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
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Copyright 2012 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/2.5
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