critical
CVE-2020-11945
squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code execution
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high), AlmaLinux (high), Amazon (high), Oracle (high), Rocky Linux (high), Ubuntu (medium).
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).
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| alma 8 | squid:4::libecap, squid:4::libecap-devel | 1.0.1-2.module_el8.6.0+2741+01592ae8 |
| alpine 3.10 | squid | 4.11-r0 |
| alpine 3.11 | squid | 4.11-r0 |
| alpine 3.9 | squid | 4.11-r0 |
| amazon linux 1 | squid, squid-debuginfo, squid-migration-script | 7:3.5.20-15.39.amzn1 |
| amazon linux 2 | squid, squid-debuginfo, squid-migration-script and 1 more | 7:3.5.20-15.amzn2.1 |
| debian 10 | squid | 4.6-1+deb10u2 |
| debian 11 | squid | 4.11-1 |
| debian 12 | squid | 4.11-1 |
| debian 13 | squid | 4.11-1 |
| debian 14 | squid | 4.11-1 |
| debian 9 | squid3 | 3.5.23-5+deb9u2 |
Show all 38 entries from 26 sources
| Source | Package | Fixed in |
|---|---|---|
| alma 8 | squid:4::libecap | 1.0.1-2.module_el8.6.0+2741+01592ae8 |
| alma 8 | squid:4::libecap-devel | 1.0.1-2.module_el8.6.0+2741+01592ae8 |
| alpine 3.10 | squid | 4.11-r0 |
| alpine 3.11 | squid | 4.11-r0 |
| alpine 3.9 | squid | 4.11-r0 |
| amazon linux 1 | squid | 7:3.5.20-15.39.amzn1 |
| amazon linux 1 | squid-debuginfo | 7:3.5.20-15.39.amzn1 |
| amazon linux 1 | squid-migration-script | 7:3.5.20-15.39.amzn1 |
| amazon linux 2 | squid | 7:3.5.20-15.amzn2.1 |
| amazon linux 2 | squid-debuginfo | 7:3.5.20-15.amzn2.1 |
| amazon linux 2 | squid-migration-script | 7:3.5.20-15.amzn2.1 |
| amazon linux 2 | squid-sysvinit | 7:3.5.20-15.amzn2.1 |
| debian 10 | squid | 4.6-1+deb10u2 |
| debian 11 | squid | 4.11-1 |
| debian 12 | squid | 4.11-1 |
| debian 13 | squid | 4.11-1 |
| debian 14 | squid | 4.11-1 |
| debian 9 | squid3 | 3.5.23-5+deb9u2 |
| echo | squid | 4.11-1 |
| Oracle Linux 7 | squid | 7:3.5.20-15.el7_8.1 |
| Oracle Linux 7 | squid-migration-script | 7:3.5.20-15.el7_8.1 |
| Oracle Linux 7 | squid-sysvinit | 7:3.5.20-15.el7_8.1 |
| Oracle Linux 8 | libecap | 1.0.1-2.module+el8.1.0+5405+03b963f4 |
| Oracle Linux 8 | libecap-devel | 1.0.1-2.module+el8.1.0+5405+03b963f4 |
| Oracle Linux 8 | squid | 7:4.4-8.module+el8.2.0+7611+d512f060.1 |
| Red Hat | squid | no fix listed |
| Red Hat | squid34 | no fix listed |
| rocky 8 | squid:4::libecap | 1.0.1-2.module+el8.4.0+404+316a0dc5 |
| rocky 8 | squid:4::libecap-devel | 1.0.1-2.module+el8.4.0+404+316a0dc5 |
| ubuntu 16.04 | squid3 | 3.5.12-1ubuntu7.11 |
| ubuntu 16.04-ESM | squid3 | 3.5.12-1ubuntu7.11 |
| ubuntu 18.04 | squid3 | 3.5.27-1ubuntu1.6 |
| ubuntu 18.04-ESM | squid3 | 3.5.27-1ubuntu1.6 |
| ubuntu 19.10 | squid | 4.8-1ubuntu2.3 |
| ubuntu 20.04 | squid | 4.10-1ubuntu1.1 |
| ubuntu 20.04-ESM | squid | 4.10-1ubuntu1.1 |
| ubuntu 20.10 | squid | 4.10-1ubuntu2 |
| ubuntu 21.04 | squid | 4.10-1ubuntu2 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
- http://master.squid-cache.org/Versions/v4/changesets/squid-4-eeebf0f37a72a2de08348e85ae34b02c34e9a811.patch
- http://www.openwall.com/lists/oss-security/2020/04/23/2
- http://www.squid-cache.org/Advisories/SQUID-2020_4.txt
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-eeebf0f37a72a2de08348e85ae34b02c34e9a811.patch
- https://access.redhat.com/security/cve/CVE-2020-11945
- https://bugzilla.redhat.com/show_bug.cgi?id=1730535
- https://bugzilla.redhat.com/show_bug.cgi?id=1827552
All 30 references
- https://bugzilla.redhat.com/show_bug.cgi?id=1827563
- https://bugzilla.suse.com/show_bug.cgi?id=1170313
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12519
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12525
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11945
- https://errata.almalinux.org/8/ALSA-2020-2041.html
- https://errata.rockylinux.org/RLSA-2020:2041
- https://github.com/squid-cache/squid/commit/eeebf0f37a72a2de08348e85ae34b02c34e9a811
- https://github.com/squid-cache/squid/pull/585
- https://linux.oracle.com/cve/CVE-2020-11945.html
- https://linux.oracle.com/errata/ELSA-2020-2041.html
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4FWQRYZJPHAZBLXJ56FPCHJN5X2FP3VA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/H4MWXEZAJSOGRJSS2JCJK4WBSND4IV46/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RV2VZWFJNO3B56IVN56HHKJASG5DYUIX/
- https://nvd.nist.gov/vuln/detail/CVE-2020-11945
- https://security.gentoo.org/glsa/202005-05
- https://security.netapp.com/advisory/ntap-20210304-0004/
- https://ubuntu.com/security/notices/USN-4356-1
- https://usn.ubuntu.com/4356-1/
- https://www.cve.org/CVERecord?id=CVE-2020-11945
- https://www.debian.org/security/2020/dsa-4682