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Home Ftp Server Directory Traversal and Denial of Service
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Secunia Advisory:
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SA16556
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Release Date:
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2005-08-25
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Last Update:
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2006-01-25
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Popularity:
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5,062 views
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Critical:
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Moderately critical
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Impact:
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Exposure of system information
Exposure of sensitive information
DoS
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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: | Home FTP Server 1.x
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| CVE reference: | CVE-2005-2726
CVE-2005-2727
CVE-2006-0356
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Description:
Two vulnerabilities have been discovered in Home FTP Server, which can be exploited by malicious users to access arbitrary files on a vulnerable system, and by malicious people to cause a DoS (Denial of Service)
1) An input validation error makes it possible to escape the FTP root and retrieve arbitrary files on the system via directory traversal attacks using the "../../" character sequence.
2) An error in the handling of the USER command with an overly long username can be exploited to cause the service to consume large amount of CPU resources and stop responding to requests.
The vulnerabilities have been confirmed in version r1.0.7 (build 45). Other versions may also be affected.
Solution:
Filter malicious characters and character sequences in a FTP proxy.
Grant only access to trusted users.
The impact of directory traversal attacks can be lessened by placing the FTP root on a separate drive letter or by restricting access using NTFS.
Provided and/or discovered by:
1) Donato Ferrante
2) cvh, Security Science Researchers Institute Of Iran.
Changelog:
2005-09-05: Added CVE reference.
2005-09-28: Added CVE reference.
2006-01-17: Added information about additional vulnerability.
2006-01-25: Added CVE reference.
Original Advisory:
http://www.autistici.org/fdonato/advisory/HomeFtpServer1.0.7-adv.txt
http://kapda.ir/advisory-211.html
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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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