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AA-2005.0032                  AUSCERT Advisory

                               AusCERT Alert
  New patches fix denial of service vulnerability in Symantec pcAnywhere
                              2 December 2005
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        AusCERT Advisory Summary
        ------------------------

Product:           Symantec pcAnywhere 11.5.1 and prior
Operating System:  Windows
Impact:            Denial of Service
Access:            Remote/Unauthenticated
Member-only until: Friday, December 30 2005

Original Bulletin: 
  http://securityresponse.symantec.com/avcenter/security/Content/2005.11.29.html

OVERVIEW:

	Symantec have released a patch[1] for a vulnerability pcAnywhere[2] 
	which may be exploited by a remote attacker to cause a denial of service 
	attack.

	While this vulnerability exists in all 32 bit versions of pcAnywhere, 
	Symantec have released patches for versions 11.5.1 and 11.0.1 only.


IMPACT:

	A remote unauthenticated attacker may be able to cause the Symantec 
	pcAnywhere to crash, preventing legitimate users from accessing the 
	remote system.


MITIGATION:

	Administrators should apply the patch referenced in [1].  Administrators 
	running versions of pcAnywhere for which a patch has not been supplied 
	should consider implementing IP based restrictions, such as firewall
	or router rules to allow connections only from trusted hosts.

	Information about the default ports used by Symantec pcAnywhere can be 
	found in [3].


REFERENCES:
	 
	[1] Symantec Advisory
	    http://securityresponse.symantec.com/avcenter/security/Content/2005.11.29.html

	[2] Symantec pcAnywhere information
	    http://www.symantec.com/home_homeoffice/products/remote_pc_fax/pca115/index.html

	[3] pcAnywhere default ports
	    http://service1.symantec.com/SUPPORT/pca.nsf/pfdocs/1998122810210812	

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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