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Vigil@nce - Apache HttpComponents HttpClient: obtaining proxy password

March 2011 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

When HttpClient connects to a proxy requiring an authentication,
the login and password are sent to the remote server.

Severity: 2/4

Creation date: 21/03/2011

IMPACTED PRODUCTS

 Apache HttpComponents HttpClient

DESCRIPTION OF THE VULNERABILITY

The Apache HttpComponents HttpClient product implements the HTTP
protocol.

An HTTP authentication uses:

 the Authorization header to authenticate on a remote server

 the Proxy-Authorization header to authenticate on the
intermediate proxy

When SSL (https) is used, the Proxy-Authorization header is used
to require the proxy to open a session to the remote server.
However, HttpClient also adds the Proxy-Authorization header to
the HTTP session tunneled by SSL. The remote server thus receives
the login and the password of the proxy.

When HttpClient connects to a proxy requiring an authentication,
the login and password are therefore sent to the remote server.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Apache-HttpComponents-HttpClient-obtaining-proxy-password-10465


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