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Gentoo Linux Security Advisory                           GLSA 200512-06

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                                            http://security.gentoo.org/

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  Severity: High

     Title: Ethereal: Buffer overflow in OSPF protocol dissector

      Date: December 14, 2005

      Bugs: #115030

        ID: 200512-06



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Synopsis

========



Ethereal is missing bounds checking in the OSPF protocol dissector that

could lead to abnormal program termination or the execution of

arbitrary code.



Background

==========



Ethereal is a feature-rich network protocol analyzer. It provides

protocol analyzers for various network flows, including one for Open

Shortest Path First (OSPF) Interior Gateway Protocol.



Affected packages

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



    -------------------------------------------------------------------

     Package                /   Vulnerable   /              Unaffected

    -------------------------------------------------------------------

  1  net-analyzer/ethereal     < 0.10.13-r2              >= 0.10.13-r2



Description

===========



iDEFENSE reported a possible overflow due to the lack of bounds

checking in the dissect_ospf_v3_address_prefix() function, part of the

OSPF protocol dissector.



Impact

======



An attacker might be able to craft a malicious network flow that would

crash Ethereal. It may be possible, though unlikely, to exploit this

flaw to execute arbitrary code with the permissions of the user running

Ethereal, which could be the root user.



Workaround

==========



There is no known workaround at this time.



Resolution

==========



All Ethereal users should upgrade to the latest version:



    # emerge --sync

    # emerge --ask --oneshot --verbose
 ">=net-analyzer/ethereal-0.10.13-r2"



References

==========



  [ 1 ] CVE-2005-3651

        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3651

  [ 2 ] iDEFENSE Advisory



display?id=349&type=vulnerabilities


Availability

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



This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:



  http://security.gentoo.org/glsa/glsa-200512-06.xml



Concerns?

=========



Security is a primary focus of Gentoo Linux and ensuring the

confidentiality and security of our users machines is of utmost

importance to us. Any security concerns should be addressed to

security@gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.



License

=======



Copyright 2005 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).



The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.



http://creativecommons.org/licenses/by-sa/2.0





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