Security update for unbound SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:20359-1 Final 1 1 2025-05-27T08:56:36Z current 2025-05-27T08:56:36Z 2025-05-27T08:56:36Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for unbound This update for unbound fixes the following issues: Update to 1.22.0: - CVE-2024-8508: Fixed unbounded name compression that could have led to a denial of service (bsc#1231284). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-SLE-Micro-6.1-123 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-202520359-1/ Link for SUSE-SU-2025:20359-1 https://lists.suse.com/pipermail/sle-updates/2025-June/039500.html E-Mail link for SUSE-SU-2025:20359-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1231284 SUSE Bug 1231284 https://www.suse.com/security/cve/CVE-2024-8508/ SUSE CVE CVE-2024-8508 page SUSE Linux Micro 6.1 libunbound8-1.22.0-slfo.1.1_1.1 unbound-anchor-1.22.0-slfo.1.1_1.1 libunbound8-1.22.0-slfo.1.1_1.1 as a component of SUSE Linux Micro 6.1 unbound-anchor-1.22.0-slfo.1.1_1.1 as a component of SUSE Linux Micro 6.1 NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic. CVE-2024-8508 SUSE Linux Micro 6.1:libunbound8-1.22.0-slfo.1.1_1.1 SUSE Linux Micro 6.1:unbound-anchor-1.22.0-slfo.1.1_1.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-202520359-1/ https://www.suse.com/security/cve/CVE-2024-8508.html CVE-2024-8508 https://bugzilla.suse.com/1231284 SUSE Bug 1231284