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Vigil@nce - Squid: assertion error via Large HTTP Response
April 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can use an HTTP reply containing a large header, to
force an assertion error in Squid, in order to trigger a denial of
service.
Impacted products: Debian, Squid, Ubuntu.
Severity: 2/4.
Creation date: 24/02/2016.
DESCRIPTION OF THE VULNERABILITY
The Squid proxy analyzes HTTP replies from servers.
However, when a reply contains an HTTP header larger than 64k
bytes, an assertion error occurs because developers did not except
this case, which stops the process.
An attacker can therefore use an HTTP reply containing a large
header, to force an assertion error in Squid, in order to trigger
a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Squid-assertion-error-via-Large-HTTP-Response-19018
