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Serv-U File Renaming Vulnerabilities and STOU Denial of Service
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Secunia Advisory:
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SA32150
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Release Date:
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2008-10-06
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Last Update:
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2008-10-10
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Popularity:
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1,154 views
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Critical:
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Moderately critical
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Impact:
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DoS
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: | Serv-U File Server 7.x
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| CVE reference: | CVE-2008-4500
CVE-2008-4501
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Description:
Some vulnerabilities have been reported in Serv-U, which can be exploited by malicious users to cause a DoS (Denial of Service) or compromise a vulnerable system.
1) An error in the handling of the "STOU" FTP command can be exploited to exhaust available CPU resources via a specially crafted argument (e.g. "CON:1").
2) An input validation error in the FTP service when renaming files can be exploited to overwrite or create arbitrary files with user-supplied content via directory traversal attacks.
3) An input validation error in the FTP service when renaming files with a certain destination setting can be exploited to move the files to the Windows directory.
Vulnerabilities #1 and #2 are confirmed in version 7.3.0.0 and vulnerability #3 is reported in versions prior to 7.3.0.1. Other versions may also be affected.
Solution:
Update to version 7.3.0.1.
http://www.serv-u.com/customer/record.asp?prod=su
Provided and/or discovered by:
1, 2) dmnt
3) Reported by the vendor.
Changelog:
2008-10-09: Added vulnerability #3. Updated "Solution" section.
2008-10-10: Added CVE reference.
Original Advisory:
Serv-U:
http://www.serv-u.com/releasenotes/
dmnt:
1) http://milw0rm.com/exploits/6660
2) http://milw0rm.com/exploits/6661
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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.
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