CVE-2020-15049

Publication date 30 June 2020

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid	21.04 hirsute	Fixed 4.12-1ubuntu1
	20.10 groovy	Fixed 4.12-1ubuntu1
	20.04 LTS focal	Fixed 4.10-1ubuntu1.3
	19.10 eoan	Ignored end of life
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
squid3	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	19.10 eoan	Not in release
	18.04 LTS bionic	Fixed 3.5.27-1ubuntu1.9
	16.04 LTS xenial	Fixed 3.5.12-1ubuntu7.15
	14.04 LTS trusty	Not in release

Notes

mdeslaur

per upstream, "This attack requires an upstream server to participate in the smuggling and generate the poison response sequence."

Patch details

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

Package	Patch details
squid	Upstream: http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H