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GENTOO LINUX SECURITY ANNOUNCEMENT 200305-09 |
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|
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PACKAGE : heimdal |
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SUMMARY : protocol bug in the kerberos v4 cross-realm operation |
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DATE : 2003-05-27 08:46 UTC |
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EXPLOIT : remote |
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VERSIONS AFFECTED : <heimdal-0.6 |
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FIXED VERSION : >=heimdal-0.6 |
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CVE : CAN-2003-0139 CAN-2003-0138 |
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|
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heimdal suffers from the same vulnerability as mit-krb5 does, hence |
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the identical advisory. |
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|
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- - From advisory: |
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"A cryptographic weakness in version 4 of the Kerberos protocol allows |
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an attacker to use a chosen-plaintext attack to impersonate any |
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principal in a realm. Additional cryptographic weaknesses in the krb4 |
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implementation included in the MIT krb5 distribution permit the use of |
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cut-and-paste attacks to fabricate krb4 tickets for unauthorized |
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client principals if triple-DES keys are used to key krb4 services. |
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These attacks can subvert a site's entire Kerberos authentication |
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infrastructure." |
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|
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Read the full advisory at |
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http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-004-krb4.txt |
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|
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SOLUTION |
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|
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It is recommended that all Gentoo Linux users who are running |
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app-crypt/heimdal upgrade to heimdal-0.6 as follows |
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|
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emerge sync |
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emerge heimdal |
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emerge clean |
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aliz@g.o - GnuPG key is available at http://cvs.gentoo.org/~aliz |
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