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CVE-2018-1000027

Published: 29 January 2018

The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
squid3
Launchpad, Ubuntu, Debian
upstream Needs triage

xenial
Released (3.5.12-1ubuntu7.5)
artful
Released (3.5.23-5ubuntu1.1)
bionic
Released (3.5.23-5ubuntu2)
cosmic Does not exist

disco Does not exist

trusty
Released (3.3.8-1ubuntu6.11)
Patches:
upstream: http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patch

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H