Luigi Auriemma has discovered a vulnerability in SurgeFTP, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to a NULL pointer dereference error when parsing HTTP headers. This can be exploited to crash an affected server via an overly large "Content-Length" HTTP header sent to the administration web server (by default port 7021/TCP).
The vulnerability is confirmed in version 2.3a1. Other versions may also be affected.
Solution: Restrict access to trusted users only.
Provided and/or discovered by: Luigi Auriemma
Original Advisory: http://aluigi.altervista.org/adv/surgeftpizza-adv.txt
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Subject: SurgeFTP "Content-Length" Denial of Service Vulnerability
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