{"id":"UBUNTU-CVE-2023-46728","details":"Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests.","modified":"2026-01-30T00:43:15.122389Z","published":"2023-11-06T18:15:00Z","related":["USN-6500-1","USN-6500-2"],"upstream":["CVE-2023-46728"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-46728"},{"type":"REPORT","url":"https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f"},{"type":"REPORT","url":"https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6500-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6500-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-46728"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.16+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.12-1ubuntu7.16+esm2"}]}],"versions":["3.3.8-1ubuntu16","3.3.8-1ubuntu17","3.5.12-1ubuntu6","3.5.12-1ubuntu7","3.5.12-1ubuntu7.1","3.5.12-1ubuntu7.2","3.5.12-1ubuntu7.3","3.5.12-1ubuntu7.4","3.5.12-1ubuntu7.5","3.5.12-1ubuntu7.6","3.5.12-1ubuntu7.7","3.5.12-1ubuntu7.8","3.5.12-1ubuntu7.9","3.5.12-1ubuntu7.10","3.5.12-1ubuntu7.11","3.5.12-1ubuntu7.12","3.5.12-1ubuntu7.13","3.5.12-1ubuntu7.14","3.5.12-1ubuntu7.15","3.5.12-1ubuntu7.16","3.5.12-1ubuntu7.16+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.5.12-1ubuntu7.16+esm2"},{"binary_name":"squid-cgi","binary_version":"3.5.12-1ubuntu7.16+esm2"},{"binary_name":"squid-common","binary_version":"3.5.12-1ubuntu7.16+esm2"},{"binary_name":"squid-purge","binary_version":"3.5.12-1ubuntu7.16+esm2"},{"binary_name":"squid3","binary_version":"3.5.12-1ubuntu7.16+esm2"},{"binary_name":"squidclient","binary_version":"3.5.12-1ubuntu7.16+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-46728.json"}},{"package":{"name":"squid3","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.14+esm1?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.27-1ubuntu1.14+esm1"}]}],"versions":["3.5.23-5ubuntu1","3.5.23-5ubuntu2","3.5.27-1ubuntu1","3.5.27-1ubuntu1.1","3.5.27-1ubuntu1.2","3.5.27-1ubuntu1.3","3.5.27-1ubuntu1.4","3.5.27-1ubuntu1.5","3.5.27-1ubuntu1.6","3.5.27-1ubuntu1.7","3.5.27-1ubuntu1.8","3.5.27-1ubuntu1.9","3.5.27-1ubuntu1.10","3.5.27-1ubuntu1.11","3.5.27-1ubuntu1.12","3.5.27-1ubuntu1.13","3.5.27-1ubuntu1.14"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.5.27-1ubuntu1.14+esm1"},{"binary_name":"squid-cgi","binary_version":"3.5.27-1ubuntu1.14+esm1"},{"binary_name":"squid-common","binary_version":"3.5.27-1ubuntu1.14+esm1"},{"binary_name":"squid-purge","binary_version":"3.5.27-1ubuntu1.14+esm1"},{"binary_name":"squid3","binary_version":"3.5.27-1ubuntu1.14+esm1"},{"binary_name":"squidclient","binary_version":"3.5.27-1ubuntu1.14+esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-46728.json"}},{"package":{"name":"squid","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/squid@4.10-1ubuntu1.8?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10-1ubuntu1.8"}]}],"versions":["4.8-1ubuntu2","4.8-1ubuntu3","4.9-2ubuntu1","4.9-2ubuntu2","4.9-2ubuntu3","4.9-2ubuntu4","4.10-1ubuntu1","4.10-1ubuntu1.1","4.10-1ubuntu1.2","4.10-1ubuntu1.3","4.10-1ubuntu1.4","4.10-1ubuntu1.5","4.10-1ubuntu1.6","4.10-1ubuntu1.7"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"4.10-1ubuntu1.8"},{"binary_name":"squid-cgi","binary_version":"4.10-1ubuntu1.8"},{"binary_name":"squid-common","binary_version":"4.10-1ubuntu1.8"},{"binary_name":"squid-purge","binary_version":"4.10-1ubuntu1.8"},{"binary_name":"squidclient","binary_version":"4.10-1ubuntu1.8"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-46728.json"}},{"package":{"name":"squid","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/squid@5.7-0ubuntu0.22.04.2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7-0ubuntu0.22.04.2"}]}],"versions":["4.13-10ubuntu5","5.2-1ubuntu1","5.2-1ubuntu3","5.2-1ubuntu4","5.2-1ubuntu4.1","5.2-1ubuntu4.2","5.2-1ubuntu4.3","5.7-0ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"5.7-0ubuntu0.22.04.2"},{"binary_name":"squid-cgi","binary_version":"5.7-0ubuntu0.22.04.2"},{"binary_name":"squid-common","binary_version":"5.7-0ubuntu0.22.04.2"},{"binary_name":"squid-openssl","binary_version":"5.7-0ubuntu0.22.04.2"},{"binary_name":"squid-purge","binary_version":"5.7-0ubuntu0.22.04.2"},{"binary_name":"squidclient","binary_version":"5.7-0ubuntu0.22.04.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-46728.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}