TITLE:
Freeftpd PORT Command Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA17737

VERIFY ADVISORY:
http://secunia.com/advisories/17737/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Freeftpd 1.x
http://secunia.com/product/6138/

DESCRIPTION:
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.

PROVIDED AND/OR DISCOVERED BY:
Stefan Lochbihler

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