CVE-2019-12525
CRITICALCVSS 9.8/10EPSS 24.40%
Last modified
CVE-2019-12525 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. EPSS estimates a 24.40% chance of exploitation in the next 30 days.
Description
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | >= 3.3.9, <= 3.5.28 |
| Squid-Cache | Squid | >= 4.0, <= 4.7 |
| Debian | Debian Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Opensuse | Leap | 15.0 |
| Opensuse | Leap | 15.1 |
| Fedoraproject | Fedora | 29 |
| Canonical | Ubuntu Linux | 12.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.04 |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlMailing List, Third Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
- https://github.com/squid-cache/squid/commits/v4Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/07/msg00018.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Aug/42Mailing List, Third Party Advisory
- https://usn.ubuntu.com/4065-1/Third Party Advisory
- https://usn.ubuntu.com/4065-2/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4507Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlMailing List, Third Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
- https://github.com/squid-cache/squid/commits/v4Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/07/msg00018.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Aug/42Mailing List, Third Party Advisory
- https://usn.ubuntu.com/4065-1/Third Party Advisory
- https://usn.ubuntu.com/4065-2/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4507Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-12525?
An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.
How severe is CVE-2019-12525?
CVE-2019-12525 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 24.40% probability of exploitation in the next 30 days.
How do I fix CVE-2019-12525?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-12525?
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