CVE-2020-11945
CRITICALCVSS 9.8/10EPSS 27.25%
Last modified
CVE-2020-11945 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. EPSS estimates a 27.25% chance of exploitation in the next 30 days.
Description
An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).
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 | >= 3.0, <= 3.5.28 |
| Squid-Cache | Squid | >= 4.0, < 4.11 |
| Squid-Cache | Squid | >= 5.0, < 5.0.2 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Opensuse | Leap | 15.1 |
| Fedoraproject | Fedora | 30 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.10 |
| Canonical | Ubuntu Linux | 20.04 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.htmlMailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/04/23/2Mailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1170313Issue Tracking, Third Party Advisory
- https://github.com/squid-cache/squid/commit/eeebf0f37a72a2de08348e85ae34b02c34e9a811Patch, Third Party Advisory
- https://github.com/squid-cache/squid/pull/585Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202005-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210304-0004/Third Party Advisory
- https://usn.ubuntu.com/4356-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.htmlMailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/04/23/2Mailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1170313Issue Tracking, Third Party Advisory
- https://github.com/squid-cache/squid/commit/eeebf0f37a72a2de08348e85ae34b02c34e9a811Patch, Third Party Advisory
- https://github.com/squid-cache/squid/pull/585Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202005-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210304-0004/Third Party Advisory
- https://usn.ubuntu.com/4356-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-11945?
An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if the pooled token credentials are freed (instead of replayed as valid credentials).
How severe is CVE-2020-11945?
CVE-2020-11945 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 27.25% probability of exploitation in the next 30 days.
How do I fix CVE-2020-11945?
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-2020-11945?
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