Rechercher
Contactez-nous Suivez-nous sur Twitter En francais English Language
 











Freely subscribe to our NEWSLETTER

Newsletter FR

Newsletter EN

Vulnérabilités

Unsubscribe

Vigil@nce - Apache httpd: denial of service via HTTP version 2

July 2016 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can send HTTP 2 requests over a TCP connection with
unusual flow control window to Apache httpd, in order to trigger a
denial of service.

Impacted products: Apache httpd.

Severity: 1/4.

Creation date: 07/07/2016.

DESCRIPTION OF THE VULNERABILITY

The Apache httpd product implements HTTP version 2.

The protocol HTTP version 2 allows to multiplex several requests
and related responses over one TCP connection (while HTTP 1 only
allows a sequence of pairs (full request, full response)).
However, when the client announces non standard TCP flow control
window, httpd allocates too many control thread to this
connection, which prevents it to serve other clients.

An attacker can therefore send HTTP 2 requests over a TCP
connection with unusual flow control window to Apache httpd, in
order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Apache-httpd-denial-of-service-via-HTTP-version-2-20039


See previous articles

    

See next articles












Your podcast Here

New, you can have your Podcast here. Contact us for more information ask:
Marc Brami
Phone: +33 1 40 92 05 55
Mail: ipsimp@free.fr

All new podcasts