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Category:   Application (Security)  >   Kerberos Vendors:   MIT
Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1026463
SecurityTracker URL:  http://securitytracker.com/id/1026463
CVE Reference:   CVE-2011-4862   (Links to External Site)
Date:  Dec 27 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

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.]

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a patch, available at:

http://web.mit.edu/kerberos/advisories/2011-008-patch.txt

The vendor's advisory is available at:

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 27 2011 (Red Hat Issues Fix) Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 4 and 5.
Dec 27 2011 (Red Hat Issues Fix) Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Dec 28 2011 (Red Hat Issues Fix) Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 6.0 and 6.1 Extended Update Support.
Dec 28 2011 (Red Hat Issues Fix) Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 3 Extended Life Cycle Support, 5.3 Long Life, and 5.6 Extended Update Support.
Feb 23 2012 (Gentoo Issues Fix) Kerberos Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code
Gentoo has issued a fix for Heimdal.



 Source Message Contents

Date:  Tue, 27 Dec 2011 17:54:16 +0000
Subject:  MIT krb5


http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt

CVE-2011-4862
 
 


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