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acFTP USER Command Denial of Service Vulnerability
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Secunia Advisory:
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SA19978
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Release Date:
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2006-05-05
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Last Update:
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2006-05-11
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Popularity:
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7,295 views
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Critical:
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Moderately critical
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Impact:
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DoS
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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: | acFTP 1.x
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| CVE reference: | CVE-2006-2242
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Description:
Preddy has discovered a vulnerability in acFTP, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error within the handling of the argument passed to the "USER" command. This can be exploited to crash the FTP server via an overly long argument that contains certain character sequences.
Example:
USER A{A{A{ [approximately 2350 bytes]
The vulnerability has been confirmed in version 1.4. Other versions may also be affected.
Solution:
The vulnerability has reportedly been fixed in the CVS repositories since 2005-03-17.
The vendor recommends users of existing acFTP.exe binary to make configuration changes to the OnStartup.rules.txt configuration file to prevent the vulnerability from being exploited. See vendor's original advisory for instructions.
Provided and/or discovered by:
Preddy
Changelog:
2006-05-10: Updated "Solution Status" and "Solution" sections.
2006-05-11: Added CVE reference.
Original Advisory:
http://sourceforge.net/forum/forum.php?forum_id=566920
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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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