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FirstClass Client File Extensions Restriction Bypass
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Secunia Advisory:
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SA10764
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Release Date:
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2004-02-05
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Popularity:
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5,967 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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Unpatched
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| Software: | FirstClass Client 7.x
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Description:
Richard Maudsley has reported a vulnerability in FirstClass Client allowing malicious users to construct filenames, which can bypass certain restrictions.
Filenames on a FirstClass system can contain characters, which are invalid on the Windows platform (and other operating systems). These characters are stripped from the filename after the extension has been verified against the rule set.
This can be exploited to bypass administrative restrictions and potentially allow automatic execution of ".exe" files.
The vulnerability has been reported in version 7.1 on the Windows platform.
Solution:
The vendor has reported that this will be fixed in version 8. A decision about whether a Service Pack should be released has not been made yet.
Provided and/or discovered by:
Richard Maudsley
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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