CVE-2019-12523

critical

Description

An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only listen on localhost.

References

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html

http://www.squid-cache.org/Advisories/SQUID-2019_8.txt

https://bugzilla.suse.com/show_bug.cgi?id=1156329

https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/

https://lists.fedoraproject.org/archives/list/[email protected]/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/

https://usn.ubuntu.com/4213-1/

https://usn.ubuntu.com/4446-1/

https://www.debian.org/security/2020/dsa-4682

Details

Source: MITRE

Published: 2019-11-26

Updated: 2020-08-24

Risk Information

CVSS v2

Base Score: 6.4

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N

Impact Score: 4.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 9.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Impact Score: 5.2

Exploitability Score: 3.9

Severity: CRITICAL