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Secunia Advisory SA13086

Mozilla / Thunderbird Valid Email Address Enumeration Weakness
Secunia Advisory SA13086
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Release Date 2004-11-03
Last Update 2005-06-21
   
Popularity 23,007 views
Comments 0 comments

Criticality level Not criticalNot critical
Impact Exposure of system information
Where From remote
Authentication level Available in Customer Area
   
Report reliability Available in Customer Area
Solution Status Vendor Patch
   
Systems affected Available in Customer Area
Approve distribution Available in Customer Area
   
Software:
Mozilla 1.7.x
Mozilla Thunderbird 0.x
Secunia CVSS Score Available in Customer Area
CVE Reference(s) No CVE references.
  

Description

plonk has discovered a weakness in Mozilla and Thunderbird, which can be exploited by malicious people to enumerate valid email addresses.

The weakness is caused due to an improper behaviour where some references to external resources in HTML documents are followed. This can be exploited to validate the existence of an mail address when a malicious mail is opened using e.g. references to external stylesheets.

The weakness has been confirmed in Mozilla 1.7.3 and 1.7.6, and Thunderbird 0.8. Other versions may also be affected.


Solution
If this is considered a problem, then disable full HTML support in emails:
Further details available in Customer Area

Provided and/or discovered by
plonk

Changelog
Further details available in Customer Area

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area


Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Mozilla / Thunderbird Valid Email Address Enumeration Weakness
 
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