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Moderately critical

Kerberos Multiple Denial of Service Vulnerabilities

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Release Date:  2011-02-09    Last Update:  2011-07-11    Views:  3,782

Secunia Advisory SA43260

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious people to cause a DoS (Denial of Service).

1) The KDC database propagation daemon (kpropd) listening process does not properly handle the abnormal termination of worker processes, which can be exploited to terminate the daemon by sending specially crafted data.

Successful exploitation requires that kpropd runs in standalone mode ("-S" option).

The vulnerability is reported in krb5-1.7, krb5-1.8, and krb5-1.9.

2) An error when processing certain Kerberos principal names in the KDC LDAP database back end can lead to file descriptor leaks, which can be exploited to cause KDC to hang by sending specially crafted requests.

The vulnerability is reported in krb5-1.6 and later.

3) A NULL pointer dereference error when processing certain Kerberos principal names exists in the KDC LDAP back end, which can be exploited to cause a crash by sending specially crafted requests.

The vulnerability is reported in krb5-1.6 and later.

4) A NULL pointer dereference error within the KDC network code can be exploited to cause a crash by sending specially crafted requests packets.

The vulnerability is reported in krb5-1.9.


Solution:
Update to version 1.7.2, 1.8.4, or 1.9.1.

Provided and/or discovered by:
3) Reported by the vendor.

The vendor credits:
1) Keiichi Mori, Red Hat
2) Kevin Longfellow, Oracle
4) Zbysek Mraz, Red Hat

Original Advisory:
MIT krb5 Security Advisory 2011-001:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-001.txt

MIT krb5 Security Advisory 2011-002:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-002.txt

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 Denial of Service Vulnerabilities

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