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UNIRAS Brief - 268/04 - OpenBSD Security Advisory - Vulnerabilities in kdc(8) and xdm(1)



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   UNIRAS (UK Govt CERT) Briefing Notice - 268/04 dated 03.06.04  Time: 13:50  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
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OpenBSD Security Advisory - Vulnerabilities in kdc(8) and xdm(1)


Detail
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A flaw in the Kerberos V kdc(8) server could result in the administrator of a 
Kerberos realm having the ability to impersonate any principal in any other realm 
which has established a cross-realm trust with their realm. The flaw is due to 
inadequate checking of the "transited" field in a Kerberos request.





===========================================================================
             
                ESB-2004.0379 -- OpenBSD Security Advisory
                   Vulnerabilities in kdc(8) and xdm(1)
                               02 June 2004

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

       

Product:                xdm
                        kdc
Publisher:              OpenBSD
Operating System:       OpenBSD
Impact:                 Reduced Security
Access Required:        Remote
CVE Names:              CAN-2004-0371, CAN-2004-0419

Comment: This ESB combines two OpenBSD security announcments.

- --------------------------BEGIN INCLUDED TEXT--------------------

A flaw in the Kerberos V kdc(8) server could result in the administrator of a Kerberos 
realm having the ability to impersonate any principal in any other realm which has 
established a cross-realm trust with their realm. The flaw is due to inadequate checking 
of the "transited" field in a Kerberos request.

Patches are available from:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.4/common/022_kerberos.patch
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/009_kerberos.patch

For more information, see:
    http://www.pdc.kth.se/heimdal/advisory/2004-04-01/

- ---

With the introduction of IPv6 code in xdm(1), one test on the 'requestPort' resource was 
deleted by accident. This makes xdm create the chooser socket even if xdmcp is disabled in 
xdm-config, by setting requestPort to 0. See XFree86 bugzilla for details. 

Patches are available from:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/008_xdm.patch

For more information, see:
    http://bugs.xfree86.org/show_bug.cgi?id=1376


- --------------------------END INCLUDED TEXT--------------------


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UNIRAS wishes to acknowledge the contributions of OpenBSD for the information 
contained in this Briefing. 
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