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CVE-2019-12524

Published: 15 April 2020

An issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its rules to see if the request should be denied. Squid by default comes with rules to block access to the Cache Manager, which serves detailed server information meant for the maintainer. This rule is implemented via url_regex. The handler for url_regex rules URL decodes an incoming request. This allows an attacker to encode their URL to bypass the url_regex check, and gain access to the blocked resource.

Notes

AuthorNote
mdeslaur
fixed in Debian's 3.5.23-5+deb9u2
same patch as CVE-2019-12520

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
squid
Launchpad, Ubuntu, Debian
groovy Not vulnerable
(4.10-1ubuntu1)
bionic Does not exist

eoan Not vulnerable
(4.8-1ubuntu2.2)
focal Not vulnerable
(4.10-1ubuntu1)
hirsute Not vulnerable
(4.10-1ubuntu1)
trusty Does not exist

upstream
Released (4.8)
xenial Does not exist

Patches:
upstream: http://www.squid-cache.org/Versions/v4/changesets/SQUID-2019_4.patch
squid3
Launchpad, Ubuntu, Debian
groovy Does not exist

bionic
Released (3.5.27-1ubuntu1.7)
eoan Does not exist

focal Does not exist

hirsute Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(code not present)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H