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WU-FTPD S/KEY Authentication Buffer Overflow Vulnerability
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Secunia Advisory:
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SA10077
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Release Date:
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2003-10-28
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Last Update:
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2004-03-09
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Popularity:
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8,828 views
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Critical:
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Highly 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: | WU-FTPD 2.x
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| CVE reference: | CVE-2004-0185
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Description:
A vulnerability has been reported in WU-FTPD, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.
The vulnerability is caused due to a boundary error in the S/KEY challenge handling. This can be exploited by supplying overly long, specially crafted user credentials, which causes a buffer overflow and may allow execution of arbitrary code.
Successful exploitation requires that S/KEY authentication has been enabled.
The vulnerability was originally reported in version 2.6.0 in June 2000, but has now also been reported to affect the latest version (2.6.2).
Solution:
Apply patch:
ftp://ftp.wu-ftpd.org/pub/wu-ftpd/patches/apply_to_2.6.2/skeychallenge.patch
Provided and/or discovered by:
Originally discovered by Michal Zalewski in version 2.6.0.
Reported in the latest version (2.6.2) by Michael Hendrickx.
Changelog:
2004-02-23: Updated "Solution" section with patch information.
2004-03-09: Added CVE reference.
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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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