Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | >= 3.0, <= 3.5.28 |
| Canonical | Ubuntu Linux | 16.04 |
| Fedoraproject | Fedora | 30 |
| Opensuse | Leap | 15.0 |
| Debian | Debian Linux | 9.0 |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlBroken Link
- http://www.squid-cache.org/Advisories/SQUID-2019_8.txtThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1156329Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://usn.ubuntu.com/4213-1/Third Party Advisory
- https://usn.ubuntu.com/4446-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlBroken Link
- http://www.squid-cache.org/Advisories/SQUID-2019_8.txtThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1156329Issue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2019-12523?
CVE-2019-12523 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 th...
How severe is CVE-2019-12523?
CVE-2019-12523 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2019-12523?
Check the references section above for vendor advisories and patch information. Affected products include: Squid-Cache Squid, Canonical Ubuntu Linux, Fedoraproject Fedora, Opensuse Leap, Debian Debian Linux.