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=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2024.2309 unbound security update 16 April 2024 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: unbound Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2024-1488 Original Bulletin: https://access.redhat.com/errata/RHSA-2024:1802 Comment: CVSS (Max): 8.0 CVE-2024-1488 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ===================================================================== Red Hat Security Advisory Synopsis: Important: unbound security update Advisory ID: RHSA-2024:1802 Product: Red Hat Enterprise Linux AppStream EUS (v.8.8) Advisory URL: https://access.redhat.com/errata/RHSA-2024:1802 Issue date: 2024-04-15 CVE Names: CVE-2024-1488 ===================================================================== 1. Summary: An update for unbound is now available for Red Hat Enterprise Linux 8.8 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux AppStream EUS (v.8.8) - aarch64, ppc64le, x86_64, i686, s390x 3. Description: The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. Security Fix(es): * A vulnerability was found in Unbound due to incorrect default permissions, allowing any process outside the unbound group to modify the unbound runtime configuration. The default combination of the "control-use-cert: no" option with either explicit or implicit use of an IP address in the "control-interface" option could allow improper access. If a process can connect over localhost to port 8953, it can alter the configuration of unbound.service. This flaw allows an unprivileged local process to manipulate a running instance, potentially altering forwarders, allowing them to track all queries forwarded by the local resolver, and, in some cases, disrupting resolving altogether. To mitigate the vulnerability, a new file "/etc/unbound/conf.d/remote-control.conf" has been added and included in the main unbound configuration file, "unbound.conf". The file contains two directives that should limit access to unbound.conf: control-interface: "/run/unbound/control" control-use-cert: "yes" For details about these directives, run "man unbound.conf". Updating to the version of unbound provided by this advisory should, in most cases, address the vulnerability. To verify that your configuration is not vulnerable, use the "unbound-control status | grep control" command. If the output contains "control(ssl)" or "control(namedpipe)", your configuration is not vulnerable. If the command output returns only "control", the configuration is vulnerable because it does not enforce access only to the unbound group members. To fix your configuration, add the line "include: /etc/unbound/conf.d/remote-control.conf" to the end of the file "/etc/unbound/unbound.conf". If you use a custom "/etc/unbound/conf.d/remote-control.conf" file, add the new directives to this file. (CVE-2024-1488) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 2264183 - CVE-2024-1488 - unbound: unrestricted reconfiguration enabled to anyone that may lead to local privilege escalation 6. Package List: Red Hat Enterprise Linux AppStream EUS (v.8.8) aarch64: python3-unbound-0:1.16.2-5.el8_8.4.aarch64.rpm python3-unbound-debuginfo-0:1.16.2-5.el8_8.4.aarch64.rpm unbound-0:1.16.2-5.el8_8.4.aarch64.rpm unbound-debuginfo-0:1.16.2-5.el8_8.4.aarch64.rpm unbound-debugsource-0:1.16.2-5.el8_8.4.aarch64.rpm unbound-devel-0:1.16.2-5.el8_8.4.aarch64.rpm unbound-libs-0:1.16.2-5.el8_8.4.aarch64.rpm unbound-libs-debuginfo-0:1.16.2-5.el8_8.4.aarch64.rpm ppc64le: python3-unbound-0:1.16.2-5.el8_8.4.ppc64le.rpm python3-unbound-debuginfo-0:1.16.2-5.el8_8.4.ppc64le.rpm unbound-0:1.16.2-5.el8_8.4.ppc64le.rpm unbound-debuginfo-0:1.16.2-5.el8_8.4.ppc64le.rpm unbound-debugsource-0:1.16.2-5.el8_8.4.ppc64le.rpm unbound-devel-0:1.16.2-5.el8_8.4.ppc64le.rpm unbound-libs-0:1.16.2-5.el8_8.4.ppc64le.rpm unbound-libs-debuginfo-0:1.16.2-5.el8_8.4.ppc64le.rpm s390x: python3-unbound-0:1.16.2-5.el8_8.4.s390x.rpm python3-unbound-debuginfo-0:1.16.2-5.el8_8.4.s390x.rpm unbound-0:1.16.2-5.el8_8.4.s390x.rpm unbound-debuginfo-0:1.16.2-5.el8_8.4.s390x.rpm unbound-debugsource-0:1.16.2-5.el8_8.4.s390x.rpm unbound-devel-0:1.16.2-5.el8_8.4.s390x.rpm unbound-libs-0:1.16.2-5.el8_8.4.s390x.rpm unbound-libs-debuginfo-0:1.16.2-5.el8_8.4.s390x.rpm x86_64: python3-unbound-0:1.16.2-5.el8_8.4.x86_64.rpm python3-unbound-debuginfo-0:1.16.2-5.el8_8.4.x86_64.rpm unbound-0:1.16.2-5.el8_8.4.x86_64.rpm unbound-debuginfo-0:1.16.2-5.el8_8.4.x86_64.rpm unbound-debugsource-0:1.16.2-5.el8_8.4.x86_64.rpm unbound-devel-0:1.16.2-5.el8_8.4.x86_64.rpm unbound-libs-0:1.16.2-5.el8_8.4.x86_64.rpm unbound-libs-debuginfo-0:1.16.2-5.el8_8.4.x86_64.rpm i686: python3-unbound-debuginfo-0:1.16.2-5.el8_8.4.i686.rpm unbound-debuginfo-0:1.16.2-5.el8_8.4.i686.rpm unbound-debugsource-0:1.16.2-5.el8_8.4.i686.rpm unbound-devel-0:1.16.2-5.el8_8.4.i686.rpm unbound-libs-0:1.16.2-5.el8_8.4.i686.rpm unbound-libs-debuginfo-0:1.16.2-5.el8_8.4.i686.rpm Source: unbound-0:1.16.2-5.el8_8.4.src.rpm 7. References: https://access.redhat.com/security/cve/CVE-2024-1488 https://access.redhat.com/security/updates/classification/#important - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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