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WU-FTPD "fb_realpath" Buffer Overflow Vulnerability
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Secunia Advisory:
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SA9406
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Release Date:
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2003-08-01
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Popularity:
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9,911 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: | WU-FTPD 2.x
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| CVE reference: | CVE-2003-0466
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Description:
A vulnerability has been identified in WU-FTPD, which can be exploited by malicious users to compromise a vulnerable system.
The vulnerability is caused due to an off-by-one error in the "fb_realpath()" function when calculating the length of a concatenated string. A logged in user with write privileges can exploit this via various commands to execute arbitrary code on the system with "root" privileges.
The vulnerability affects versions 2.5.0 through 2.6.2. However, it can only be exploited on systems running any 2.0.x kernel version or a later 2.4.x kernel version.
Solution:
Allow only trusted users to login or disallow write privileges for untrusted users.
Use another FTP server until an updated version or patch is released.
http://www.wuftpd.org/
Provided and/or discovered by:
Wojciech Purczynski and Janusz Niewiadomski (iSEC Security Research).
Original Advisory:
http://isec.pl/vulnerabilities/isec-0011-wu-ftpd.txt
Other References:
http://www.kb.cert.org/vuls/id/743092
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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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