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WS_FTP Server FTP Command Buffer Overflow Vulnerability
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Secunia Advisory:
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SA9671
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Release Date:
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2003-09-04
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Last Update:
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2003-09-22
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Popularity:
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8,594 views
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Critical:
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Highly 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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Vendor Patch
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| Software: | WS_FTP Server 3.x
WS_FTP Server 4.x
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Description:
A vulnerability has been reported in WS_FTP Server, which can be exploited by malicious users to compromise a vulnerable system.
The vulnerability is caused due to a boundary error when handling user input to the FTP commands "APPE" and "STAT". This can be exploited by supplying a specially crafted argument longer than 255 bytes, which causes a buffer overflow.
Successful exploitation allows execution of arbitrary code with the privileges of the FTP server but requires that the malicious person has been authenticated by the FTP server.
The vulnerability was reported in version 3.4 and has been confirmed in version 4.01. However, other versions may also be affected.
NOTE: A related vulnerability was reported in 2001 in version 2.0.3 but fixed in version 2.0.4.
Solution:
Ipswitch has issued a patch, which applies to version 4.x:
ftp://ftp.ipswitch.com/ipswitch/product_support/ws_ftp_server/ifs402.exe
Provided and/or discovered by:
Davarzani Pejman (pejman@rite.ca)
Changelog:
2003-09-18: Updated with link to patch.
2003-09-22: Added links to CERT vulnerability notes.
Other References:
CERT VU#219140:
http://www.kb.cert.org/vuls/id/219140
CERT VU#792284:
http://www.kb.cert.org/vuls/id/792284
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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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