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             AUSCERT External Security Bulletin Redistribution

                ESB-2004.0597 -- OpenBSD Security Advisory
                     Security flaw in login_radius(8)
                             22 September 2004

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

Product:                login_radius(8)
Publisher:              OpenBSD
Operating System:       OpenBSD-current
                        OpenBSD 3.6
                        OpenBSD 3.5
                        OpenBSD 3.4
Impact:                 Inappropriate Access
Access:                 Remote/Unauthenticated

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Eilko Bos has reported that radius authentication, as implemented
by login_radius(8), was not checking the shared secret used for
replies sent by the radius server.  This could allow an attacker
to spoof a reply granting unauthorized access to the system.

This has been fixed in OpenBSD-current, OpenBSD 3.6, and the 3.4
and 3.5 -stable branches.  Patches are also available for OpenBSD
3.4 and 3.5:

    ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.4/common/031_radius.patch
    ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.5/common/020_radius.patch

Note that OpenBSD does not ship with radius authentication enabled.
Unless you have explicitly enabled radius authentication in
/etc/login.conf there is no impact.

For more details see:

    http://www.reseau.nl/advisories/0400-openbsd-radius.txt

 - todd
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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

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