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Vulnerability Note VU#704024
MIT Kerberos 5 administration daemon stack overflow in krb5_klog_syslog()
OverviewThe Kerberos administration daemon contains a buffer overflow that may allow a remote, authenticated attacker to execute arbitrary code or cause a denial of service.
I. DescriptionA vulnerability exists in the way the krb5_klog_syslog() function used by the Kerberos administration daemon handles specially crafted strings. This vulnerability may cause a buffer overflow that could allow a remote, authenticated user to execute arbitrary code. According to MIT krb5 Security Advisory MITKRB5-SA-2007-002:
krb5_klog_syslog() uses vsprintf() to format text into a fixed-length stack buffer. Format specifiers such as "%s" used in calls to krb5_klog_syslog() may allow formatting of strings of sufficient length to overwrite memory past the end of the stack buffer.
Certain strings received from the client by the kadmin daemon are not truncated prior to logging. Among these strings is the target principal for the kadmin operation.
The KDC truncates most client-originated strings prior to logging. One sort of string which is not truncated is a transited-realms string. A malicious KDC sharing a key with the target realm may issue tickets with specially-crafted transited-realms strings to exploit this vulnerability. There are other places where an authenticated user may cause the KDC to log a string which triggers the vulnerability.
Note that this issue affects all releases of MIT krb5 up to and including krb5-1.6. Other server applications that call the krb5_klog_syslog()function provided with MIT krb5 may also be affected.
This vulnerability can be triggered by sending a specially crafted Kerberos message to a vulnerable system.
II. ImpactA remote, authenticated user may be able to execute arbitrary code on an affected system or cause the affected program to crash, resulting in a denial of service. Secondary impacts of code execution include complete compromise of the Kerberos key database.
III. SolutionApply Patch
A patch can be obtained from MIT krb5 Security Advisory MITKRB5-SA-2007-002. MIT also states that this will be addressed in the upcoming krb5-1.6.1 release.
Systems Affected
| Vendor | Status | Date Notified | Date Updated |
|---|
| 3com, Inc. | Unknown | 4-Apr-2007 |
| Alcatel | Unknown | 4-Apr-2007 |
| Apple Computer, Inc. | Vulnerable | 20-Apr-2007 |
| AttachmateWRQ, Inc. | Not Vulnerable | 4-Apr-2007 |
| AT&T | Unknown | 4-Apr-2007 |
| Avaya, Inc. | Unknown | 4-Apr-2007 |
| Avici Systems, Inc. | Unknown | 4-Apr-2007 |
| Borderware Technologies | Unknown | 4-Apr-2007 |
| Charlotte's Web Networks | Unknown | 4-Apr-2007 |
| Check Point Software Technologies | Unknown | 4-Apr-2007 |
| Chiaro Networks, Inc. | Unknown | 4-Apr-2007 |
| Cisco Systems, Inc. | Not Vulnerable | 2-Apr-2007 |
| Clavister | Unknown | 4-Apr-2007 |
| Computer Associates | Unknown | 4-Apr-2007 |
| Conectiva Inc. | Unknown | 4-Apr-2007 |
| Cray Inc. | Unknown | 4-Apr-2007 |
| CyberSafe, Inc. | Not Vulnerable | 4-Apr-2007 |
| D-Link Systems, Inc. | Unknown | 4-Apr-2007 |
| Data Connection, Ltd. | Unknown | 4-Apr-2007 |
| Debian GNU/Linux | Vulnerable | 4-Apr-2007 |
| EMC, Inc. (formerly Data General Corporation) | Unknown | 4-Apr-2007 |
| Engarde Secure Linux | Unknown | 4-Apr-2007 |
| Ericsson | Unknown | 4-Apr-2007 |
| eSoft, Inc. | Unknown | 4-Apr-2007 |
| Extreme Networks | Unknown | 4-Apr-2007 |
| F5 Networks, Inc. | Unknown | 4-Apr-2007 |
| Fedora Project | Unknown | 4-Apr-2007 |
| Force10 Networks, Inc. | Not Vulnerable | 4-Apr-2007 |
| Fortinet, Inc. | Unknown | 4-Apr-2007 |
| Foundry Networks, Inc. | Unknown | 4-Apr-2007 |
| FreeBSD, Inc. | Unknown | 4-Apr-2007 |
| Fujitsu | Unknown | 4-Apr-2007 |
| Gentoo Linux | Vulnerable | 4-Apr-2007 |
| Global Technology Associates | Unknown | 4-Apr-2007 |
| Heimdal Kerberos Project | Not Vulnerable | 4-Apr-2007 |
| Hewlett-Packard Company | Unknown | 4-Apr-2007 |
| Hitachi | Not Vulnerable | 2-Apr-2007 |
| Hitachi | Not Vulnerable | 4-Apr-2007 |
| Hyperchip | Unknown | 4-Apr-2007 |
| IBM Corporation | Not Vulnerable | 4-Apr-2007 |
| IBM Corporation (zseries) | Unknown | 4-Apr-2007 |
| IBM eServer | Unknown | 4-Apr-2007 |
| Immunix Communications, Inc. | Unknown | 4-Apr-2007 |
| Ingrian Networks, Inc. | Unknown | 4-Apr-2007 |
| Intel Corporation | Unknown | 4-Apr-2007 |
| Internet Security Systems, Inc. | Unknown | 4-Apr-2007 |
| Intoto | Not Vulnerable | 4-Apr-2007 |
| IP Filter | Unknown | 4-Apr-2007 |
| Juniper Networks, Inc. | Not Vulnerable | 4-Apr-2007 |
| KTH Kerberos Team | Unknown | 4-Apr-2007 |
| Linksys (A division of Cisco Systems) | Unknown | 4-Apr-2007 |
| Lucent Technologies | Unknown | 4-Apr-2007 |
| Luminous Networks | Unknown | 4-Apr-2007 |
| Mandriva, Inc. | Vulnerable | 5-Apr-2007 |
| Microsoft Corporation | Not Vulnerable | 4-Apr-2007 |
| MIT Kerberos Development Team | Vulnerable | 3-Apr-2007 |
| MontaVista Software, Inc. | Unknown | 4-Apr-2007 |
| Multinet (owned Process Software Corporation) | Unknown | 4-Apr-2007 |
| Multitech, Inc. | Unknown | 4-Apr-2007 |
| NEC Corporation | Not Vulnerable | 6-Apr-2007 |
| NetBSD | Unknown | 4-Apr-2007 |
| netfilter | Unknown | 4-Apr-2007 |
| Network Appliance, Inc. | Unknown | 4-Apr-2007 |
| NextHop Technologies, Inc. | Unknown | 4-Apr-2007 |
| Nokia | Unknown | 4-Apr-2007 |
| Nortel Networks, Inc. | Unknown | 4-Apr-2007 |
| Novell, Inc. | Vulnerable | 5-Apr-2007 |
| OpenBSD | Unknown | 4-Apr-2007 |
| Openwall GNU/*/Linux | Not Vulnerable | 4-Apr-2007 |
| QNX, Software Systems, Inc. | Unknown | 4-Apr-2007 |
| Red Hat, Inc. | Vulnerable | 2-Apr-2007 |
| Redback Networks, Inc. | Unknown | 4-Apr-2007 |
| Riverstone Networks, Inc. | Unknown | 4-Apr-2007 |
| rPath | Vulnerable | 5-Apr-2007 |
| Secure Computing Network Security Division | Unknown | 4-Apr-2007 |
| Secureworx, Inc. | Unknown | 4-Apr-2007 |
| Silicon Graphics, Inc. | Unknown | 4-Apr-2007 |
| Slackware Linux Inc. | Unknown | 4-Apr-2007 |
| Sony Corporation | Unknown | 4-Apr-2007 |
| Stonesoft | Unknown | 4-Apr-2007 |
| Sun Microsystems, Inc. | Unknown | 4-Apr-2007 |
| SUSE Linux | Vulnerable | 5-Apr-2007 |
| Symantec, Inc. | Not Vulnerable | 5-Apr-2007 |
| The SCO Group | Unknown | 4-Apr-2007 |
| Trustix Secure Linux | Vulnerable | 6-Apr-2007 |
| Turbolinux | Unknown | 4-Apr-2007 |
| Ubuntu | Vulnerable | 4-Apr-2007 |
| Unisys | Unknown | 4-Apr-2007 |
| Watchguard Technologies, Inc. | Unknown | 4-Apr-2007 |
| Wind River Systems, Inc. | Unknown | 4-Apr-2007 |
| ZyXEL | Unknown | 4-Apr-2007 |
References
http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2007-002-syslog.txt
http://web.mit.edu/kerberos/advisories/2007-002-patch.txt
http://web.mit.edu/kerberos/advisories/2007-002-patch.txt.asc
http://secunia.com/advisories/24757/
http://secunia.com/advisories/24735/
http://secunia.com/advisories/24750/
http://secunia.com/advisories/24740/
https://secure-support.novell.com/KanisaPlatform/Publishing/150/3618705_f.SAL_Public.html
http://securitytracker.com/alerts/2007/Apr/1017849.html
http://docs.info.apple.com/article.html?artnum=305391
http://secunia.com/advisories/24966/
http://secunia.com/advisories/25464/
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102930-1
Credit
This issue was reported in MIT krb5 Security Advisory MITKRB5-SA-2007-002. The MIT Kerberos Development Team credits iDefense Labs for reporting this issue.
This document was written by Chris Taschner.
Other Information
| Date Public: | 2007-04-03 |
| Date First Published: | 2007-04-03 |
| Date Last Updated: | 2007-05-30 |
| CERT Advisory: | |
| CVE-ID(s): | CVE-2007-0957 |
| NVD-ID(s): | CVE-2007-0957 |
| US-CERT Technical Alerts: | |
| Metric: | 16.96 |
| Document Revision: | 55 |
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