Stefan Lochbihler has discovered a vulnerability in freeftpd, which can be exploited by malicious users to cause a DoS (Denial of Service).
The vulnerability is caused due to a NULL pointer dereferencing error that exists when parsing the parameter of the PORT command. This is due to the failure to check for a NULL return value from the "strstr()" function when looking for the "," separator. This can be exploited to crash the service.
The vulnerability has been confirmed in version 1.0.10. Other versions may also be affected.
Solution: Grant only trusted users access to the FTP service.
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Subject: Freeftpd PORT Command Denial of Service Vulnerability
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