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Insecure Library Loading
Highly critical

Kerberos Multiple Vulnerabilities

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Release Date:  2007-09-05    Last Update:  2007-09-13    Views:  15,352

Secunia Advisory SA26676

Where:

From remote

Impact:

DoS, System access

Solution Status:

Vendor Workaround

Software:

CVE Reference(s):

Description


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

1) A boundary error within the implementation of the RPCSEC_GSS authentication type exists in the "svcauth_gss_validate()" function in src/lib/rpc/svc_auth_gss.c. This can be exploited to cause a stack-based buffer overflow by sending a specially crafted RPC message to a vulnerable server.

Successful exploitation potentially allows the execution of arbitrary code. Products linking to the RPC library may also be affected.

2) The "kadm5_modify_policy_internal()" function in src/lib/kadm5/srv/svr_policy.c does not correctly check return values of the "krb5_db_get_policy()" function. This can be exploited to cause a memory corruption and may potentially allow the execution of arbitrary code.

Successful exploitation requires valid user credentials and privileges to modify policies.

Vulnerability #1 is reported in krb5-1.4 through krb5-1.6.2, vulnerability #2 is reported in krb5-1.5 through krb5-1.6.2.


Solution:
Update to Kerberos 1.5.5 or 1.6.3 as soon as available or apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Tenable Network Security, reported via the Zero Day Initiative.
2) Garrett Wollman, MIT CSAIL.

Original Advisory:
MIT Kerberos:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-006.txt

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-07-052.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Kerberos Multiple Vulnerabilities

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