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Vigil@nce - Blue Coat ProxySG: credentials disclosure via HTTP 407 Challenges

February 2016 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker owning a malicious web server can return HTTP 407
pages to Blue Coat ProxySG, in order to get client credentials.

Impacted products: ProxySG, SGOS.

Severity: 2/4.

Creation date: 08/12/2015.

DESCRIPTION OF THE VULNERABILITY

The HTTP protocol uses the code 407 to require a challenge during
an authentication, such as NTLM.

However, ProxySG transmits these codes to the client

An attacker owning a malicious web server can therefore return
HTTP 407 pages to Blue Coat ProxySG, in order to get client
credentials.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Blue-Coat-ProxySG-credentials-disclosure-via-HTTP-407-Challenges-18458


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