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Kerberos Multiple Vulnerabilities Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA25800  
Release Date: 2007-06-27

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Workaround

Software:Kerberos 5.x

CVE reference:CVE-2007-2442 (Secunia mirror)
CVE-2007-2443 (Secunia mirror)
CVE-2007-2798 (Secunia mirror)



Description:
Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious users and malicious people to compromise a vulnerable system.

1) An error exists within the "gssrpc__svcauth_gssapi" function in the RPC library, which can cause kadmind and possibly other third-party products to free an uninitialised pointer when receiving an RPC credential with a length of zero.

2) A signedness error exists within the "gssrpc__svcauth_unix()" function in the RPC library, which is used by kadmind and possibly other third-party products. This can be exploited to cause a stack-based buffer overflow.

Successful exploitation of vulnerability #1 and #2 potentially allows execution of arbitrary code.

3) A boundary error exists in kadmind within the "rename_principal_2_svc()" function and can be exploited to cause a stack-based buffer overflow.

Successful exploitation allows execution of arbitrary code but requires valid user credentials.

The vulnerabilities are reported in krb5-1.6.1. Other versions may also be affected.

Solution:
Apply patches (see vendor advisories for details).

http://web.mit.edu/kerberos/advisories/2007-004-patch.txt
http://web.mit.edu/kerberos/advisories/2007-004-patch.txt.asc

http://web.mit.edu/kerberos/advisories/2007-005-patch.txt
http://web.mit.edu/kerberos/advisories/2007-005-patch.txt.asc

Provided and/or discovered by:
1, 2) The vendor credits Wei Wang, McAfee Avert Labs.
3) An anonymous person, reported via iDefense Labs.

Original Advisory:
Kerberos:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-004.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-005.txt

iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=548

Other References:
US-CERT VU#356961:
http://www.kb.cert.org/vuls/id/356961

US-CERT VU#365313:
http://www.kb.cert.org/vuls/id/365313

US-CERT VU#554257:
http://www.kb.cert.org/vuls/id/554257



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

19 Related Secunia Security Advisories, displaying 10

1. Kerberos Multiple Vulnerabilities
2. Kerberos Multiple Vulnerabilities
3. Kerberos Multiple Vulnerabilities
4. Kerberos kadmind xprt->xp_auth Code Execution Vulnerability
5. Kerberos kadmind "mechglue" Code Execution Vulnerability
6. Kerberos V5 setuid Security Issue
7. Kerberos V5 Multiple Vulnerabilities
8. Kerberos V5 Telnet Client Information Disclosure Weakness
9. MIT Kerberos Telnet Client Buffer Overflow Vulnerabilities
10. Kerberos V5 "libkadm5srv" Buffer Overflow Vulnerability

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