lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Thu, 4 Jan 2007 09:18:23 +0100 (CET)
From: Michal Zalewski <>
To: "William A. Rowe, Jr." <>
Subject: Re: a cheesy Apache / IIS DoS vuln (+a question)

On Wed, 3 Jan 2007, William A. Rowe, Jr. wrote:

> Seriously, HTTP pipelining can accomplish EXACTLY the same thing with minimal
> pain.

No, it can't. Client-side pipelining using simultaneous sessions with
keep-alives is usually severely restricted on server-side (exactly for the
reason they can be abused to DoS the server), and the overhead is much
higher (you need to send hundreds of bytes to request a copy of a static

Here, requesting an extra copy costs you 3 bytes, and that is in my
opinion notable - because you can do it thousands of times in a single
short request.

> If you have an issue with this behavior, of HTTP, then you have an issue
> with the behavior under FTP or a host of other protocols.

Not really; see above. These are typically well known, preventable by
configuring server-side limits, and require a much higher overhead.


Powered by blists - more mailing lists