Heimdal Kerberos 'kadmind' Buffer Overflow Lets Remote Users Execute Arbitrary Code With Root Privileges
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SecurityTracker Alert ID: 1005459 |
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SecurityTracker URL: http://securitytracker.com/id/1005459
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CVE Reference:
CAN-2002-1235
(Links to External Site)
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Updated: Apr 26 2004
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Original Entry Date: Oct 22 2002
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Impact:
Execution of arbitrary code via network, Root access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 0.5.1
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Description:
A buffer overflow vulnerability was reported in 'kadmind', the administrative access server for the Kerberos database in the Heimdal distribution. A remote user may be able to execute arbitrary code on the system with root level privileges.
It is reported that kadmind in Heimdal releases earlier than 0.5.1 has a buffer overflow in the kerberos version 4 compatibility code. If compiled with support for the Kerberos 4 kadmin protocol, kadmind is vulnerable.
A remote user can cause arbitrary code to be executed with root level privileges.
To determine if kadmind is vulnerable you can run:
# /usr/heimdal/libexec/kadmind --version
kadmind (Heimdal 0.5.1, KTH-KRB 1.2)
Copyright (c) 1999-2002 Kungliga Tekniska H gskolan
Send bug-reports to heimdal-bugs@pdc.kth.se
Non-vulnerable versions reportedly include Heimdal 0.5.1 and binaries that do *not* show a Kerberos 4 version string (KTH-KRB 1.2 in the example).
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Impact:
A remote user can execute arbitrary code with root privileges to gain root access on the system.
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Solution:
The vendor has released a fixed version (0.5.1), available at:
ftp://ftp.pdc.kth.se/pub/heimdal/src
If you are running a version older than 0.5.1 and have Kerberos 4 support enabled in kadmind, the vendor indicates that you should disable it until you have time to upgrade.
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Vendor URL: www.pdc.kth.se/heimdal/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Mon, 21 Oct 2002 22:45:17 -0400
Subject: kadmind bug
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http://www.pdc.kth.se/heimdal/
2002-10-21: Security advisory regarding kadmind
All versions of the kadmind daemon are vulnerable to a remote root exploit, if compiled
with support for the Kerberos 4 kadmin protocol. Heimdal 0.5.1 should fix this problem.
If you are running a version older than 0.5.1 AND have Kerberos 4 support enabled in
kadmind you should disable it until you have time to upgrade.
To tell if kadmind is vulnerable you can run:
# /usr/heimdal/libexec/kadmind --version
kadmind (Heimdal 0.5.1, KTH-KRB 1.2)
Copyright (c) 1999-2002 Kungliga Tekniska Högskolan
Send bug-reports to heimdal-bugs@pdc.kth.se
Non-vulnerable include Heimdal 0.5.1, and binaries that DO NOT show a Kerberos 4 version
string (KTH-KRB 1.2 in the example).
The kadmind service should run on your master kdc, and can be run either from inetd, or as
a standalone daemon.
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The code is currently at release 0.5.1 and is available at
ftp://ftp.pdc.kth.se/pub/heimdal/src.
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