Bugzilla – Bug 1185921
VUL-0: CVE-2021-28651: squid,squid3: SQUID-2021:1 Denial of Service in URN processing
Last modified: 2022-10-18 09:39:50 UTC
Due to a buffer management bug Squid is vulnerable to a Denial of service attack against the server it is operating on. This attack is limited to proxies which attempt to resolve a "urn:" resource identifier. Support for this resolving is enabled by default in all Squid. Severity: This problem allows a malicious server in collaboration with a trusted client to consume arbitrarily large amounts of memory on the server running Squid. Lack of available memory resources impacts all services on the machine running Squid. Once initiated the DoS situation will persist until Squid is shutdown. CVSS Score of 8.5 https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C/CR:X/IR:X/AR:H/MAV:N/MAC:L/MPR:N/MUI:R/MS:C/MC:X/MI:X/MA:H&version=3.1 Updated Packages: This bug is fixed by Squid versions 4.15 and 5.0.6. In addition, patches addressing this problem for the stable releases can be found in our patch archives: Squid 4: http://www.squid-cache.org/Versions/v4/changesets/squid-4-a975fd5aedc866629214aaaccb38376855351899.patch If you are using a prepackaged version of Squid then please refer to the package vendor for availability information on updated packages. Determining if your version is vulnerable: Squid older than 3.5.28 have not been tested and should be assumed to be vulnerable. All Squid-4.x up to and including 4.14 are vulnerable. All Squid-5.x up to and including 5.0.5 are vulnerable. Workaround: Disable URN processing by the proxy. Add these lines to squid.conf: acl URN proto URN http_access deny URN Contact details for the Squid project: For installation / upgrade support on binary packaged versions of Squid: Your first point of contact should be your binary package vendor. If you install and build Squid from the original Squid sources then the squid-users@lists.squid-cache.org mailing list is your primary support point. For subscription details see http://www.squid-cache.org/Support/mailing-lists.html. For reporting of non-security bugs in the latest STABLE release the squid bugzilla database should be used http://bugs.squid-cache.org/. For reporting of security sensitive bugs send an email to the squid-bugs@lists.squid-cache.org mailing list. It's a closed list (though anyone can post) and security related bug reports are treated in confidence until the impact has been established. Credits: This vulnerability was discovered by Joshua Rogers of Opera Software. Fixed by Amos Jeffries of Treehouse Networks Ltd. Revision history: 2021-02-22 06:55:38 UTC Initial Report 2021-02-24 00:53:21 UTC Patch Released 2021-03-17 06:19:09 UTC CVE Assignment END
Affected packages: - SUSE:SLE-11-SP1:Update/squid3 3.1.23 - SUSE:SLE-12-SP2:Update/squid 3.5.21 - SUSE:SLE-12-SP5:Update/squid 4.13 - SUSE:SLE-15:Update/squid 4.13 - openSUSE:Factory/squid 4.14 Patch 4.x [0] [0] http://www.squid-cache.org/Versions/v4/changesets/squid-4-a975fd5aedc866629214aaaccb38376855351899.patch
SUSE-SU-2021:1838-1: An update that solves 5 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1171164,1171569,1183436,1185916,1185918,1185919,1185921,1185923 CVE References: CVE-2020-25097,CVE-2021-28651,CVE-2021-28652,CVE-2021-28662,CVE-2021-31806 JIRA References: Sources used: SUSE Linux Enterprise Server 12-SP5 (src): squid-4.15-4.18.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2021:1961-1: An update that solves 5 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1171164,1171569,1183436,1185916,1185918,1185919,1185921,1185923 CVE References: CVE-2020-25097,CVE-2021-28651,CVE-2021-28652,CVE-2021-28662,CVE-2021-31806 JIRA References: Sources used: SUSE Manager Server 4.0 (src): squid-4.15-5.26.1 SUSE Manager Retail Branch Server 4.0 (src): squid-4.15-5.26.1 SUSE Manager Proxy 4.0 (src): squid-4.15-5.26.1 SUSE Linux Enterprise Server for SAP 15-SP1 (src): squid-4.15-5.26.1 SUSE Linux Enterprise Server for SAP 15 (src): squid-4.15-5.26.1 SUSE Linux Enterprise Server 15-SP1-LTSS (src): squid-4.15-5.26.1 SUSE Linux Enterprise Server 15-SP1-BCL (src): squid-4.15-5.26.1 SUSE Linux Enterprise Server 15-LTSS (src): squid-4.15-5.26.1 SUSE Linux Enterprise Module for Server Applications 15-SP3 (src): squid-4.15-5.26.1 SUSE Linux Enterprise Module for Server Applications 15-SP2 (src): squid-4.15-5.26.1 SUSE Linux Enterprise High Performance Computing 15-SP1-LTSS (src): squid-4.15-5.26.1 SUSE Linux Enterprise High Performance Computing 15-SP1-ESPOS (src): squid-4.15-5.26.1 SUSE Linux Enterprise High Performance Computing 15-LTSS (src): squid-4.15-5.26.1 SUSE Linux Enterprise High Performance Computing 15-ESPOS (src): squid-4.15-5.26.1 SUSE Enterprise Storage 6 (src): squid-4.15-5.26.1 SUSE CaaS Platform 4.0 (src): squid-4.15-5.26.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
openSUSE-SU-2021:0879-1: An update that solves 5 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1171164,1171569,1183436,1185916,1185918,1185919,1185921,1185923 CVE References: CVE-2020-25097,CVE-2021-28651,CVE-2021-28652,CVE-2021-28662,CVE-2021-31806 JIRA References: Sources used: openSUSE Leap 15.2 (src): squid-4.15-lp152.2.9.1
openSUSE-SU-2021:1961-1: An update that solves 5 vulnerabilities and has three fixes is now available. Category: security (important) Bug References: 1171164,1171569,1183436,1185916,1185918,1185919,1185921,1185923 CVE References: CVE-2020-25097,CVE-2021-28651,CVE-2021-28652,CVE-2021-28662,CVE-2021-31806 JIRA References: Sources used: openSUSE Leap 15.3 (src): squid-4.15-5.26.1
SUSE-SU-2022:14914-1: An update that fixes two vulnerabilities is now available. Category: security (important) Bug References: 1183436,1185921 CVE References: CVE-2020-25097,CVE-2021-28651 JIRA References: Sources used: SUSE Linux Enterprise Server 11-SP4-LTSS (src): squid3-3.1.23-8.16.37.18.1 SUSE Linux Enterprise Point of Sale 11-SP3 (src): squid3-3.1.23-8.16.37.18.1 SUSE Linux Enterprise Debuginfo 11-SP4 (src): squid3-3.1.23-8.16.37.18.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2022:2392-1: An update that fixes three vulnerabilities is now available. Category: security (important) Bug References: 1183436,1185921,1200907 CVE References: CVE-2020-25097,CVE-2021-28651,CVE-2021-46784 JIRA References: Sources used: SUSE OpenStack Cloud Crowbar 9 (src): squid-3.5.21-26.35.1 SUSE OpenStack Cloud 9 (src): squid-3.5.21-26.35.1 SUSE Linux Enterprise Server for SAP 12-SP4 (src): squid-3.5.21-26.35.1 SUSE Linux Enterprise Server 12-SP4-LTSS (src): squid-3.5.21-26.35.1 SUSE Linux Enterprise Server 12-SP3-BCL (src): squid-3.5.21-26.35.1 SUSE Linux Enterprise Server 12-SP2-BCL (src): squid-3.5.21-26.35.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.