AUSCERT External Security Bulletin Redistribution

                ESB-2003.0855 -- Ethereal Security Advisory
                   Security problems in Ethereal 0.9.16
                             16 December 2003


        AusCERT Security Bulletin Summary

Product:                ethereal 0.9.16 and prior
Publisher:              NS Computer Software and Services P/L
Impact:                 Denial of Service
                        Execute Arbitrary Code/Commands
Access Required:        Remote

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Name: Security problems in Ethereal 0.9.16
Docid: enpa-sa-00012

Date: December 12, 2003

Severity: High


Serious issues have been discovered in the following protocol dissectors: 

 o Selecting "Match->Selected" or "Prepare->Selected" for a malformed SMB
   packet could cause a segmentation fault. 
 o It is possible for the Q.931 dissector to dereference a null pointer when
   reading a malformed packet. 


Both vulnerabilities will make the Ethereal application crash. The Q.931
vulnerability also affects Tethereal. It is not known if either vulnerability
can be used to make Ethereal or Tethereal run arbitrary code. 


Upgrade to 0.10.0.

If you are running a version prior to 0.10.0 and you cannot upgrade, you can
disable the SMB and Q.931 protocol dissectors by selecting Edit->Protocols...
and deselecting them from the list. 

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