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CVE-2021-28652

Published: 27 May 2021

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This attack is limited to clients with Cache Manager API access privilege.

Notes

AuthorNote
mdeslaur
this issue only affects the Cache Manager, which is usually
restricted to trusted clients only.
The patch is intrusive to backport to 3.x versions, so we will
not be fixing this issue in older releases. We recommend setting
appropriate access control to limit connections from trusted
clients.

Priority

Low

Cvss 3 Severity Score

4.9

Score breakdown

Status

Package Release Status
squid
Launchpad, Ubuntu, Debian
focal
Released (4.10-1ubuntu1.4)
groovy
Released (4.13-1ubuntu2.2)
hirsute
Released (4.13-1ubuntu4.1)
impish
Released (4.13-10ubuntu1)
jammy
Released (4.13-10ubuntu1)
bionic Does not exist

trusty Does not exist

upstream
Released (4.15,4.13-10)
xenial Does not exist

Patches:
upstream: http://www.squid-cache.org/Versions/v4/changesets/squid-4-0003e3518dc95e4b5ab46b5140af79b22253048e.patch
upstream: https://github.com/squid-cache/squid/commit/0003e3518dc95e4b5ab46b5140af79b22253048e
squid3
Launchpad, Ubuntu, Debian
bionic
Released (3.5.27-1ubuntu1.11)
impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Ignored

focal Does not exist

groovy Does not exist

hirsute Does not exist

Severity score breakdown

Parameter Value
Base score 4.9
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H