CVE-2020-15811

CVE Details

Release Date:

2020-09-02

Description

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting 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 browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.

See more information about CVE-2020-15811 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	6.5	Base Metrics:	AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Access Vector:	Network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	High	Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (squid)	ELSA-2020-4082	2020-10-08
Oracle Linux version 8 (libecap)	ELSA-2020-3623	2020-09-04
Oracle Linux version 8 (squid)	ELSA-2020-3623	2020-09-04

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team