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             AUSCERT External Security Bulletin Redistribution

                ESB-2003.0208 -- OpenBSD Security Advisory
            patches available for the Kerberos v4 protocol bug
                               25 March 2003

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                ALL implementations of version 4 of the Kerberos
                        protocol
Vendor:                 OpenBSD
Operating System:       OpenBSD 3.1
                        OpenBSD 3.2
                        Linux
                        UNIX
Impact:                 Root Compromise
                        Access Privileged Data
Access Required:        Remote

Ref:                    ESB-2003.0205

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There is a cryptographic weaknesses in the Kerberos v4 protocol
(this is not something that is fixable in Kerberos v4). Sites still
using Kerberos v4 should migrate to Kerberos v5.

Kerberos v5 does not have this weakness, but since it contains v4
to v5 translation services it is still possible to exploit the v4
protocol defect.

For more information, please see:
    http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-004-krb4.txt

The following patches cause Kerberos v4 requests from foreign realms
to be ignored unless support for this is explicitly enabled.

Patch for OpenBSD 3.1:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.1/common/026_kerberos.patch

Patch for OpenBSD 3.2:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.2/common/013_kerberos.patch

The aforementioned patches have already been applied to the 3.1 and
3.2 -stable branches.

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