(OpenBSD Issues Fix for 3.2) Heimdal Kerberos 'kadmind' Buffer Overflow Lets Remote Users Execute Arbitrary Code With Root Privileges
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SecurityTracker Alert ID: 1005578 |
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SecurityTracker URL: http://securitytracker.com/id/1005578
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CVE Reference:
CAN-2002-1235
(Links to External Site)
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Date: Nov 8 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:
OpenBSD has issued for OpenBSD 3.2, available in the -STABLE branch or as a standalone patch file:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.2/common/001_kadmin.patch
Fixes for other versions of OpenBSD were issued (and addressed in separate Alerts). For more information, see:
http://www.openbsd.org/errata.html
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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:
UNIX (BSD/OS)
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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: Tue, 5 Nov 2002 15:39:09 +0000
Subject: OpenBSD 3.2 patch 001 released
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OpenBSD 3.2, as shipped, is vulnerable to a kadmind remote exploit if the
machine is configured as a kdc (which is not the case in the default
install).
A fix addressing this problem is available in the -STABLE branch, and as
a standalone patch file, at the following location:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.2/common/001_kadmin.patch
For more information about errata and patch, please read the OpenBSD
errata page:
http://www.openbsd.org/errata.html
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