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National Cyber Alert System
Technical Cyber Security Alert TA07-177A
MIT Kerberos Vulnerabilities
Original release date: June 26, 2007
Last revised: --
Source: US-CERT
Systems Affected
* MIT Kerberos
Other products that use the RPC library provided with MIT Kerberos or
other RPC libraries derived from SunRPC may also be affected.
Overview
The MIT Kerberos 5 implementation contains several vulnerabilities.
Exploitation of these vulnerabilities could allow a remote,
unauthenticated attacker to execute arbitrary code or cause a denial
of service on a vulnerable system.
I. Description
There are three vulnerabilities that affect MIT Kerberos 5:
* VU#356961 - MIT Kerberos RPC library gssrpc__svcauth_gssapi()
uninitialized pointer free vulnerability
A vulnerability in the MIT Kerberos administration daemon
(kadmind) may allow an uninitialized pointer to be freed, which
may allow a remote, unauthenticated user to execute arbitrary
code. This vulnerability can be triggered by sending a specially
crafted Kerberos message to a vulnerable system.
* VU#365313 - MIT Kerberos kadmind RPC library
gssrpc__svcauth_unix() integer conversion error
An integer conversion error vulnerability exists in the MIT
Kerberos kadmind that may allow a remote, unauthenticated user to
execute arbitrary code.
* VU#554257 - MIT Kerberos kadmind principal renaming stack buffer
overflow
A stack buffer overflow exists in the way the MIT Kerberos kadmind
handles the principle renaming operation, which may allow a
remote, authenticated user to execute arbitrary code.
II. Impact
A remote, unauthenticated attacker may be able to execute arbitrary
code on KDCs, systems running kadmind, and application servers that
use the RPC library. An attacker could also cause a denial of service
on any of these systems. These vulnerabilities could result in the
compromise of both the KDC and an entire Kerberos realm.
III. Solution
Check with your vendors for patches or updates. For information about
a vendor, please see the systems affected section in the individual
vulnerability notes or contact your vendor directly.
Alternatively, apply the appropriate source code patches referenced in
MITKRB5-SA-2007-004 and MITKRB5-SA-2007-005 and recompile.
These vulnerabilities will also be addressed in the krb5-1.6.2 and
krb5-1.5.4 releases.
IV. References
* US-CERT Vulnerability Note VU#365313 - <http://www.kb.cert.org/vuls/id/365313>
* US-CERT Vulnerability Note VU#356961 - <http://www.kb.cert.org/vuls/id/356961>
* US-CERT Vulnerability Note VU#554257 - <http://www.kb.cert.org/vuls/id/554257>
* MIT krb5 Security Advisory 2007-004 -
<http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-004.txt>
* MIT krb5 Security Advisory 2007-005 -
<http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-005.txt>
____________________________________________________________________
The most recent version of this document can be found at:
<http://www.us-cert.gov/cas/techalerts/TA07-177A.html>
____________________________________________________________________
Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@xxxxxxxx> with "TA07-177A Feedback VU#554257" in the
subject.
____________________________________________________________________
For instructions on subscribing to or unsubscribing from this
mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
____________________________________________________________________
Produced 2007 by US-CERT, a government organization.
Terms of use:
<http://www.us-cert.gov/legal.html>
____________________________________________________________________
Revision History
June 26, 2007: Initial release
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