Luigi Auriemma has reported a vulnerability in Flash Messaging server, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an input validation error in the handling of wide chars (16-bit). This can be exploited to cause a vulnerable server to crash by sending some specially crafted wide characters from the client.

It has also been reported that a client can avoid being kicked by e.g. ignoring the shutdown command.

The vulnerability has been reported in version 5.2.0g (rev 1.1.2). Other versions may also be affected.

Solution
Restrict access to the Flash Messaging server.

Provided and/or discovered by
Luigi Auriemma

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://aluigi.altervista.org/adv/flashmsg-adv.txt

Deep Links
Links available to Secunia VIM customers