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TITLE:
Microsoft Windows "WRITE_ANDX" SMB Packet Handling Denial of Service

SECUNIA ADVISORY ID:
SA31883

VERIFY ADVISORY:
http://secunia.com/advisories/31883/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Microsoft Windows Vista
http://secunia.com/advisories/product/13223/

DESCRIPTION:
A vulnerability has been reported in Microsoft Windows Vista, 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
processing of "WRITE_ANDX" packets within srv.sys. This can be
exploited to cause an invalid memory access and crash the system via
a specially crafted SMB packet.

Successful exploitation without valid user credentials requires
network access to an interface that allows NULL Sessions (e.g.
"\LSARPC" on Windows Vista).

The vulnerability is reported in Microsoft Windows Vista SP1. Other
versions may also be affected.

SOLUTION:
Restrict network access to the affected service.

PROVIDED AND/OR DISCOVERED BY:
Javier Vicente Vallejo

ORIGINAL ADVISORY:
http://www.vallejo.cc/proyectos/vista_SMB_write_DoS.htm

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