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Linux-ftpd-ssl FTP Server Response Buffer Overflow Vulnerability
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Secunia Advisory:
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SA17465
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Release Date:
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2005-11-08
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Last Update:
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2005-11-14
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Critical:
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Moderately 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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Unpatched
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| Software: | Linux-ftpd-ssl 0.x
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| | CVE reference: | CVE-2005-3524 (Secunia mirror)
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This advisory is currently marked as unpatched!
- Companies can be alerted when a patch is released! |
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Description:
kcope has reported a vulnerability in Linux-ftpd-ssl, which can be exploited by malicious users to compromise a vulnerable system.
The vulnerability is caused due to the unsafe use of the "vsprintf()" function in the FTP server to generate replies in response to commands received from the FTP client. This causes a stack-based buffer overflow when the output of a command exceeds 2048 bytes. The vulnerability can be exploited by creating multiple levels of sub-directories with long names, and then issuing the "XPWD" command when at the lowest level sub-directory. The resulting path name that is generated in response the "XPWD" will exceed 2048 bytes, overflowing the stack-buffer.
Successful exploitation requires that the user is able to create directories on the FTP server, or perform some actions that will cause the FTP server to generate an overly long reply.
The vulnerability affects NetKit Linux-ftpd version 0.17 with the Linux-ftpd-ssl patch version 0.3. Other versions may also be vulnerable.
NOTE: The vulnerability was introduced due to the Linux-ftpd-ssl patch. An exploit for this vulnerability is publicly available.
Solution:
Grant only trusted users access to the FTP server.
Provided and/or discovered by:
kcope
Changelog:
2005-11-14: 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.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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