CVEvulnerability
CVE-2019-12524
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2020-04-15
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-306
Description
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.
Affected configurations
• squid-cache squid (<= 4.7)
• debian debian linux 9.0
• debian debian linux 10.0
• canonical ubuntu linux 16.04
• canonical ubuntu linux 18.04
Related
Weakness · CWE (1)
- CWE-306 Missing Authentication for Critical Functionality weakness
References
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12524.txt Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210205-0006/ Third Party Advisory
- https://usn.ubuntu.com/4446-1/ Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682 Third Party Advisory
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12524.txt Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210205-0006/ Third Party Advisory
- https://usn.ubuntu.com/4446-1/ Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682 Third Party Advisory