Re: [patch 29/37] dvb-core: Proper handling ULE SNDU length of 0

Marcel Holtmann
2006-09-07T11:06:09Z

Hi Greg,

> ULE (Unidirectional Lightweight Encapsulation RFC 4326) decapsulation
> code has a bug that allows an attacker to send a malformed ULE packet
> with SNDU length of 0 and bring down the receiving machine. This patch
> fix the bug and has been tested on version 2.6.17.11. This bug is 100%
> reproducible and the modified source code (GPL) used to produce this bug
> will be posted on http://nrg.cs.usm.my/downloads.htm shortly. The
> kernel will produce a dump during CRC32 checking on faulty ULE packet.

the upstream code changed for 2.6.18. It has a different way of
addressing this issue, but it also changes a lot of other stuff in the
whole code. However it might be worth looking at it, because the
upstream code might be still vulnerable.

Regards

Marcel