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TITLE:
3proxy FTP Proxy Module "OPEN" Command Double-Free Vulnerability

SECUNIA ADVISORY ID:
SA27353

VERIFY ADVISORY:
http://secunia.com/advisories/27353/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

SOFTWARE:
3proxy 0.x
http://secunia.com/product/14006/

DESCRIPTION:
Venustech AD-LAB has reported a vulnerability in 3proxy, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a double-free error within
"ftpprchild()" in the FTP proxy module (ftppr) when handling "OPEN"
FTP proxy commands. This can be exploited to cause the 3proxy service
to crash via sending more than one "OPEN" command to the service.

The vulnerability reportedly affects versions 0.5 to 0.5.3i.

SOLUTION:
Update to version 0.5.3j.
http://3proxy.ru/download/

PROVIDED AND/OR DISCOVERED BY:
Venustech AD-LAB.

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-October/066985.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-October/066994.html

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