Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Detailed Explanation for this Vulnerability Assessment
A cryptographic weakness in version 4 of the Kerberos protocol permits
a possible hacker to use a chosen-plaintext attack to impersonate any
principal in a realm. Additional cryptographic weaknesses in the krb4
implementation permit the use of cut-and-paste attacks to fabricate
krb4 tickets for unauthorized client principals if triple-DES keys are
used to key krb4 services. These attacks can subvert a site's entire
Kerberos authentication infrastructure.
This version of the heimdal package changes the default behavior and
dispermits cross-realm authentication for Kerberos version 4. Because
of the fundamental nature of the problem, cross-realm authentication
in Kerberos version 4 cannot be made secure and sites should avoid its
use. A new option (--kerberos4-cross-realm) is provided to the kdc
command to re-enable version 4 cross-realm authentication for those
sites that must use this functionality but desire the other security
For the stable distribution (woody) this problem has been
fixed in version 0.4e-7.woody.8.
The old stable distribution (potato) is not affected by this problem,
since it isn't compiled against kerberos 4.
For the unstable distribution (sid) this problem has been
fixed in version 0.5.2-1.
We recommend that you upgrade your heimdal packages immediately.
Solution : http://www.debian.org/security/2003/dsa-269
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2005 Michel Arboi
|AMD Phenom II X2 521 AM2+/AM3 CPU HDX521OCK23GM 3.50GHz
|AMD Turion 64 X2 TL-64 CPU TMDTL64HAX5CT 2.20GHz
|Intel Xeon W3680 LGA1366 CPU SLBV2 3.33GHz
|AMD Athlon II X4 630 Socket AM2+/AM3 CPU ADX630WFK42GM 2.80GHz
No Discussions have been posted on this vulnerability.