Igor Franchuk has discovered a weakness in Microsoft Windows, which can be exploited to hide certain information.
The weakness is caused due to an error in the Registry Editor Utility (regedit.exe) when handling long string names. This can be exploited to hide strings in a registry key by creating a string with a long name, which causes this string and any subsequently created strings in the key to be hidden.
Successful exploitation e.g. makes it possible for malware to hide strings in the "Run" registry key. However, these hidden strings created after the string with the overly long name will still be executed when the user logs in.
The same problem reportedly also exists for overly long registry keys.
The weakness has been confirmed in fully updated Windows XP SP2 and Windows 2000 SP4 systems. Other versions may also be affected.
NOTE: The "regedt32.exe" utility on Windows 2000 is also affected, but in a slightly different way.
NOTE: A virus is reportedly exploiting this method to hide in the registry.
Solution: It's possible to see hidden registry strings with the "reg" command line utility.
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
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Subject: Windows Registry Editor Utility String Concealment Weakness
RE: Windows Registry Editor Utility String Concealment Weakness
29th Jul, 2010 07:57
Score: 376 Posts: 872 User Since: 3rd May 2009 System Score: 100% Location: US
(unknown source) how can I delete my post?
The only chance you have is to edit it before someone else makes a reply, which is what you apparently tried to do. If this happens again try "Sorry!" or "Pardon me!" and you may not get so many negative votes. :)
The vulnerability report, in this part of the forum, is only needing a response if you have specific info on the vulnerability. Best to ask questions elsewhere on a different part of the Secunia forum. When in doubt, start a thread in "Open Discussions".
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