CVE-2020-11945 in the critical feed json
An issue was discovered in Squid before 5.0.2.
published 6y ago modified 4mo ago also EUVD-2020-4282
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 27.2%
- EPSS 27.2% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
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).
Patch / fix
- squid-cache squid 4.11, 5.0.2
- squid Debian 14, Debian 13, Debian 12 4.11-1
debian advisories DEBIAN-CVE-2020-11945
- squid Ubuntu 20.04 LTS 4.10-1ubuntu1.1
- squid3 Ubuntu 16.04 LTS 3.5.12-1ubuntu7.11
- squid3 Ubuntu 18.04 LTS 3.5.27-1ubuntu1.6
ubuntu advisories UBUNTU-CVE-2020-11945
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- squid RHEL 7 7:3.5.20-15.el7_8.1
- squid-sysvinit RHEL 7 7:3.5.20-15.el7_8.1
- squid-migration-script RHEL 7 7:3.5.20-15.el7_8.1
- squid RHEL 8 7:4.4-8.module+el8.2.0+6449+6ba3df3e.1
- libecap RHEL 8, RHEL 8.1 EUS 1.0.1-2.module+el8.1.0+4044+36416a77
- squid RHEL 8.1 EUS 7:4.4-8.module+el8.1.0+6436+af881f9b.1
- squid RHEL 8.0 E4S 7:4.4-5.module+el8.0.0+6430+d78e5241.1
- libecap RHEL 8.0 E4S 1.0.1-2.module+el8.0.0+4045+70edde92
red hat advisories RHSA-2020:2040RHSA-2020:2041RHSA-2020:2039RHSA-2020:2038
- squid3 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 3.1.23-8.16.37.12.1
- squid SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +10 more 3.5.21-26.23.1
- squid SLES for SAP 15, SLES 15-LTSS, SLE Module for Server Applications 15 SP1 +2 more 4.11-5.17.2
- squid SLES for SAP 12 SP5, SLES 12 SP5 4.11-4.9.1
suse advisories SUSE-SU-2020:14460-1SUSE-SU-2020:1227-1SUSE-SU-2020:1156-1SUSE-SU-2020:1134-1
- squid openSUSE Tumbleweed 4.16-1.5
- squid openSUSE Leap 15.1 4.11-lp151.2.15.2
opensuse advisories openSUSE-SU-2024:11403-1openSUSE-SU-2020:0623-1
- libecap AlmaLinux 8 1.0.1-2.module_el8.6.0+2741+01592ae8
almalinux advisories ALSA-2020:2041
- libecap Rocky Linux 8 1.0.1-2.module+el8.4.0+404+316a0dc5
rocky linux advisories RLSA-2020:2041
- squid Alpine 3.11, Alpine 3.10, Alpine 3.9 4.11-r0
alpine advisories ALPINE-CVE-2020-11945
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- squid Arch Linux 4.12-1
arch linux advisories AVG-1146
Is CVE-2020-11945 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-11945 updated cvss 8.1
squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code execution
-
Red Hat Enterprise Linux 5 squidaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 6 squid, squid34affected: no fix planned “Will not fix”
-
Red Hat Enterprise Linux AppStream (v. 8) squid 4.4-8.module+el8.2.0+6449+6ba3df3e.1, libecap 1.0.1-2.module+el8.1.0+4044+36416a77fixed: vendor fix RHSA-2020:2041
-
Red Hat Enterprise Linux AppStream E4S (v. 8.0) squid 4.4-5.module+el8.0.0+6430+d78e5241.1, libecap 1.0.1-2.module+el8.0.0+4045+70edde92fixed: vendor fix RHSA-2020:2038
-
Red Hat Enterprise Linux AppStream EUS (v. 8.1) squid 4.4-8.module+el8.1.0+6436+af881f9b.1, libecap 1.0.1-2.module+el8.1.0+4044+36416a77fixed: vendor fix RHSA-2020:2039
-
Red Hat Enterprise Linux Server (v. 7) squid 3.5.20-15.el7_8.1, squid-migration-script 3.5.20-15.el7_8.1 Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit 3.5.20-15.el7_8.1 Red Hat Enterprise Linux Workstation (v. 7) squid 3.5.20-15.el7_8.1, squid-migration-script 3.5.20-15.el7_8.1 Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit 3.5.20-15.el7_8.1fixed: vendor fix RHSA-2020:2040
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
27.25% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-190 Integer Overflow or Wraparound
References
-
github.com
/squid-cache/squid/pull/585
patch, third-party-advisory
-
github.com
/squid-cache/squid/commit/eeebf0f37a72a2de08348e85ae34b02c34e9a811
patch, third-party-advisory
-
squid-cache.org
/Versions/v4/changesets/squid-4-eeebf0f37a72a2de08348e85ae34b02c34e9a811.patch
patch, vendor-advisory
-
debian.org
/security/2020/dsa-4682
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2020-05/msg00018.html
vendor-advisory, mailing-list, third-party-advisory
-
security.gentoo.org
/glsa/202005-05
vendor-advisory, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/4FWQRYZJPHAZBLXJ56FPCHJN5X2FP3VA/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/RV2VZWFJNO3B56IVN56HHKJASG5DYUIX/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/H4MWXEZAJSOGRJSS2JCJK4WBSND4IV46/
vendor-advisory
-
usn.ubuntu.com
/4356-1/
vendor-advisory, third-party-advisory
-
master.squid-cache.org
/Versions/v4/changesets/squid-4-eeebf0f37a72a2de08348e85ae34b02c34e9a811.patch
vendor-advisory
-
openwall.com
/lists/oss-security/2020/04/23/2
mailing-list, third-party-advisory
-
bugzilla.suse.com
/show_bug.cgi?id=1170313
issue-tracking, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2020/07/msg00009.html
mailing-list, third-party-advisory
-
security.netapp.com
/advisory/ntap-20210304-0004/
third-party-advisory
Sources
- CVE List CVE-2020-11945
- NVD CVE-2020-11945
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.