CVE-2016-4553

Publication date 10 May 2016

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.6 · High

Score breakdown

Description

client_side.cc in Squid before 3.5.18 and 4.x before 4.0.10 does not properly ignore the Host header when absolute-URI is provided, which allows remote attackers to conduct cache-poisoning attacks via an HTTP request.

Read the notes from the security team

Status

Package Ubuntu Release Status
squid3 16.04 LTS xenial
Fixed 3.5.12-1ubuntu7.2
15.10 wily
Fixed 3.3.8-1ubuntu16.3
14.04 LTS trusty
Fixed 3.3.8-1ubuntu6.8
12.04 LTS precise
Not affected

Notes

sbeattie

3.2.0.11 and later versions up to and including 3.5.17

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
squid3

Severity score breakdown

Parameter Value
Base score 8.6 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Changed
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

Other references