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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
Check for the version of the krb5 package
Detailed Explanation for this Vulnerability Assessment
The remote host is missing the patch for the advisory FEDORA-2005-552 (krb5).
Kerberos V5 is a trusted-third-party network authentication system,
which can improve your network's security by eliminating the insecure
practice of cleartext passwords.
A double-free flaw was found in the krb5_recvauth() routine which may
be triggered by a remote unauthenticated attacker. Fedora Core 3
contains checks within glibc that detect double-free flaws. Therefore,
on Fedora Core 3, successful exploitation of this issue can only lead
to a denial of service (KDC crash). The Common Vulnerabilities and
Exposures project assigned the name CVE-2005-1689 to this issue.
Daniel Wachdorf discovered a single byte heap overflow in the
krb5_unparse_name() function, part of krb5-libs. Successful
exploitation of this flaw would lead to a denial of service (crash).
To trigger this flaw remotely, a possible hacker would need to have control
of a kerberos realm that shares a cross-realm key with the target,
making exploitation of this flaw unlikely. (CVE-2005-1175).
Daniel Wachdorf also discovered that in error conditions that may
occur in response to correctly-formatted client requests, the Kerberos
5 KDC may attempt to free uninitialized memory. This could permit a
remote attacker to cause a denial of service (KDC crash)
Gaël Delalleau discovered an information disclosure issue in the way
some telnet clients handle messages from a server. A possible hacker could
construct a malicious telnet server that collects information from the
environment of any victim who connects to it using the Kerberos-aware
telnet client (CVE-2005-0488).
The rcp protocol permits a server to instruct a client to write to
arbitrary files outside of the current directory. This could
potentially cause a security issue if a user uses the Kerberos-aware
rcp to copy files from a malicious server (CVE-2004-0175).
Solution : http://www.fedoranews.org/blog/index.php?p=753
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Tenable Network Security
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