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UNIRAS Brief - 567/05 - Greasemonkey - Remote Access Vulnerability



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 567/05 dated 21.07.05  Time: 11:35  
  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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Greasemonkey - Remote Access Vulnerability

Detail
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UNIRAS has been made aware of a vulnerability in Greasemonkey, a Mozilla Firefox
extension.  The Greasemonkey website has this statement:

  "A severe security issue has been discovered in Greasemonkey versions prior to 
   0.3.5 as well as the early 0.4 alphas which some people may have installed. 
   Install Greasemonkey 0.3.5 or uninstall Greasemonkey immediately."
       http://greasemonkey.mozdev.org/


The Greasemonkey blog explains the vulnerability in more detail.  The following is
an extract from that page:

  "Yesterday, Mark Pilgrim discovered and announced a very serious security 
   vulnerability in Greasemonkey. The flaw allows any website which matches at 
   least one user script (even * scripts) to read any local file on your machine, 
   or to list the contents of local directories. The flaw applies to Greasemonkey 
   on all platforms."
      http://greaseblog.blogspot.com/2005/07/mandatory-greasemonkey-update.html
 


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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 
EMail to: uniras@xxxxxxxxxxxx

Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 870 487 0748 Ext 4511
Fax: +44 (0) 870 487 0749

Outside of Office Hours:
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 Greasemonkey 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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