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Opera Browser Arbitrary File Deletion Vulnerability
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Secunia Advisory:
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SA10425
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Release Date:
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2003-12-13
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Popularity:
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11,642 views
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Critical:
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Moderately critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Opera 7.x
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Description:
A vulnerability has been reported in Opera, which can be exploited by malicious people to delete arbitrary files on a user's system.
The vulnerability is caused due to an input validation error during the creation of a temporary file when a download dialog box is displayed. The temporary file's name is based on the name of the downloaded file, but inadequate sanitation of certain character sequences in the name makes it possible to conduct a directory traversal attack and thereby escape the temporary folder.
Example, which overwrites "calc.exe" on a user's system:
http://[malicious_website]/[path]/AAAAAAAAAA%5C..%5C..%5Ccalc.exe
Successful exploitation allows a malicious website to overwrite and delete arbitrary files on a user's system with the user's privileges.
The vulnerability affects 7.x versions for Windows prior to 7.23.
Solution:
Update to version 7.23.
Run applications with least privilege to mitigate the impact of exploitation. Users should not browse the Internet with administrative privileges.
Provided and/or discovered by:
imagine and nesumin, Operash.
Original Advisory:
http://opera.rainyblue.org/adv/opera07-autodel-en.php
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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