Home page logo

fulldisclosure logo Full Disclosure mailing list archives

Re: IPS Evasion with the Apache HTTP Server
From: coderman <coderman () gmail com>
Date: Tue, 19 Jun 2007 12:44:00 -0700

On 6/19/07, H D Moore <fdlist () digitaloffense net> wrote:
Many commercial IPS products fail to decode HTTP requests which use 0x0c,
0x0b, and 0x0d instead of the normal 0x20/0x09 separators.
A request which contains multiple CRLF sequences instead of a valid method
is processed by Apache, yet ignored by most IPS engines

you can use many more than that.  fill spaces with non printable and
apache (and a few others) will eat it fine.  \x01-\x1f, except ESC,
maybe CR/LF depending on placement...

is there a page somewhere that details which web servers handle sloppy
input?  (i bet the embedded httpd's are the most resistant)

Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]