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CVE-2020-15810

Published: 24 August 2020

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the proxy cache and any downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a conflicting length to be used from another Content-Length header) but relayed upstream.

Priority

Medium

CVSS 3 base score: 6.5

Status

Package Release Status
squid
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (4.10-1ubuntu1.2)
groovy
Released (4.13-1ubuntu1)
hirsute
Released (4.13-1ubuntu1)
precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

squid3
Launchpad, Ubuntu, Debian
bionic
Released (3.5.27-1ubuntu1.9)
focal Does not exist

groovy Does not exist

hirsute Does not exist

precise Ignored
(end of ESM support, was needs-triage)
trusty Does not exist

upstream Needs triage

xenial
Released (3.5.12-1ubuntu7.15)