[PATCH] fix weakness by logging of broken header by incorect proxy protocol (IDS/IPS/LOG-analysis)

[Maxim Dounin]

Hello!

On Mon, Sep 26, 2022 at 11:16:05PM +0200, Dipl. Ing. Sergey Brester via nginx-devel wrote:

> below is a patch to fix a weakness by logging of broken header by
> incorrect proxy protocol. 
> 
> If some service (IDS/IPS) analyzing or monitoring log-file, regularly
> formatted lines may be simply confused with lines written not escaped
> directly from buffer supplied from foreign source.
> Not to mention it may open a certain vector allowing "injection" of user
> input in order to avoid detection of failures or even to simulate
> malicious traffic from legitimate service. 

https://trac.nginx.org/nginx/ticket/191

-- 
Maxim Dounin
http://mdounin.ru/