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Home >> Browse Vulnerability Assessment Database >> Fedora Local Security Checks >> Fedora Core 4 2005-553: krb5


Vulnerability Assessment Details

Fedora Core 4 2005-553: krb5

Vulnerability Assessment Summary
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-2005-553 (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.

Update Information:

A double-free flaw was found in the krb5_recvauth() routine which may be
triggered by a remote unauthenticated attacker. Fedora Core 4 contains
checks within glibc that detect double-free flaws. Therefore, on Fedora
Core 4, 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) (CVE-2005-1174).

GaŽl 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://fedoranews.org//mediawiki/index.php/Fedora_Core_4_Update:_krb5-1.4.1-5
Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Tenable Network Security

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