Vigil@nce: Zope, HTTP injection
November 2008 by Vigil@nce
An attacker can inject HTTP data in a Zope session.
Consequences: data flow
Provenance: user account
Means of attack: no proof of concept, no attack
Ability of attacker: expert (4/4)
Confidence: confirmed by the editor (5/5)
Diffusion of the vulnerable configuration: high (3/3)
Creation date: 27/10/2008
The HTTP protocol uses a line feed:
between each header, and
between the end of headers and the beginning of data
A HTTP header cannot contain a line feed (CRLF or "\r\n"). However, Zope does not correctly filter user data and generates HTTP replies with headers containing a line feed. This error thus interferes the HTTP protocol analysis by proxies or web browsers.
An attacker can therefore for example inject additional data in a HTTP stream.