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UNIRAS Brief - 520/05 - OpenBSD - Buffer overflow in zlib



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 520/05 dated 08.07.05  Time: 14:30  
  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
=====
OpenBSD - Buffer overflow in zlib

Detail
====== 

Insufficient checking in the zlib compression library (installed
as libz on OpenBSD) can result in a buffer overflow and a program
crash.  It is not known at this time whether maliciously-crafted
compressed files can be used to execute arbitrary code.

Since zlib is in wide use throughout the base OS, as well as in
ports, users are advised to patch their systems as soon as possible.

A fix has been committed to OpenBSD-current as well as the 3.6 and
3.7 -stable branches.  Patches are also available for OpenBSD 3.6
and 3.7.  OpenBSD versions 3.4 and lower are not affected as they
use an older version of zlib that does not contain the vulnerable
code.

3.6 patch:  
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.6/common/019_libz.patch
3.7 patch:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.7/common/004_libz.patch

The 3.6 patch also applies to OpenBSD 3.5.


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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via 
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On Call Duty Officer:
Tel: +44 (0) 870 487 0748 and follow the prompts

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UNIRAS wishes to acknowledge the contributions of OpenBSD for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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