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Home » Hacking News » Gentoo 200305-09: Heimdal protocol bug

Gentoo 200305-09: Heimdal protocol bug

by Nikola Strahija on May 27th, 2003 A cryptographic weakness in version 4 of the Kerberos protocol allows an attacker to use a chosen-plaintext attack to impersonate any principal in a realm.


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GENTOO LINUX SECURITY ANNOUNCEMENT 200305-09
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PACKAGE : heimdal
SUMMARY : protocol bug in the kerberos v4 cross-realm operation
DATE : 2003-05-27 08:46 UTC
EXPLOIT : remote
VERSIONS AFFECTED : FIXED VERSION : >=heimdal-0.6
CVE : CAN-2003-0139 CAN-2003-0138

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heimdal suffers from the same vulnerability as mit-krb5 does, hence
the identical advisory.

- - From advisory:
"A cryptographic weakness in version 4 of the Kerberos protocol allows
an attacker to use a chosen-plaintext attack to impersonate any
principal in a realm. Additional cryptographic weaknesses in the krb4
implementation included in the MIT krb5 distribution 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."

Read the full advisory at
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-004-krb4.txt

SOLUTION

It is recommended that all Gentoo Linux users who are running
app-crypt/heimdal upgrade to heimdal-0.6 as follows

emerge sync
emerge heimdal
emerge clean

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[email protected] - GnuPG key is available at http://cvs.gentoo.org/~aliz
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