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Moderately critical

Serv-U File Renaming Vulnerabilities and STOU Denial of Service

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Release Date:  2008-10-06    Last Update:  2008-10-10    Views:  6,824

Secunia Advisory SA32150

Where:

From remote

Impact:

DoS, System access

Solution Status:

Vendor Patch

CVE Reference(s):

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.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1, 2) dmnt
3) Reported by the vendor.

Original Advisory:
Serv-U:
http://www.serv-u.com/releasenotes/

dmnt:
1) http://milw0rm.com/exploits/6660
2) http://milw0rm.com/exploits/6661

Deep Links:
Links available to Secunia VIM customers

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 information to vuln@secunia.com

Subject: Serv-U File Renaming Vulnerabilities and STOU Denial of Service

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