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MIT krb5: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200409-09 / mit-krb5
Release Date September 06, 2004
Latest Revision September 06, 2004: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-crypt/mit-krb5 < 1.3.4 >= 1.3.4 All supported architectures

Related bugreports: #62417


MIT krb5 contains several double-free vulnerabilities, potentially allowing the execution of arbitrary code, as well as a denial of service vulnerability.

2.  Impact Information


MIT krb5 is the free implementation of the Kerberos network authentication protocol by the Massachusetts Institute of Technology.


The implementation of the Key Distribution Center (KDC) and the MIT krb5 library contain double-free vulnerabilities, making client programs as well as application servers vulnerable.

The ASN.1 decoder library is vulnerable to a denial of service attack, including the KDC.


The double-free vulnerabilities could allow an attacker to execute arbitrary code on a KDC host and hosts running krb524d or vulnerable services. In the case of a KDC host, this can lead to a compromise of the entire Kerberos realm. Furthermore, an attacker impersonating a legitimate KDC or application server can potentially execute arbitrary code on authenticating clients.

An attacker can cause a denial of service for a KDC or application server and clients, the latter if impersonating a legitimate KDC or application server.

3.  Resolution Information


There is no known workaround at this time.


All mit-krb5 users should upgrade to the latest stable version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=app-crypt/mit-krb5-1.3.4"
# emerge ">=app-crypt/mit-krb5-1.3.4"

4.  References


Page updated September 06, 2004

Summary: This is a Gentoo Linux Security Advisory

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