Opera CSLID extension spoof

opera-cslid-extension-spoof (21698) The risk level is classified as MediumMedium Risk


Opera could allow a remote attacker to spoof file types in the file download dialog. A remote attacker can embed a CSLID into the file name and trick Opera into opening a file type with a different application than specified. The attacker could exploit this vulnerability to possibly cause the victim to open malicious file types.


File Manipulation


Upgrade to the latest version of Opera (7.50b1 or later), available from the Opera Download page. See References.


  • Opera Download page: Download Opera Web Browser.
  • Opera Web site: Opera Web Browser.
  • BID-9640: Opera Web Browser CLSID File Extension Misrepresentation Vulnerability
  • CVE-2004-2083: Opera Web Browser 7.0 through 7.23 allows remote attackers to trick users into executing a malicious file by embedding a CLSID in the file name, which causes the malicious file to appear as a trusted file type, aka File Download Extension Spoofing.
  • OSVDB ID: 3917: Opera Browser File Download Extension Spoofing
  • SA10760: Opera Browser File Download Extension Spoofing

Platforms Affected:

  • Opera Opera Browser prior to 7.50


Feb 11, 2004

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