Vulnerability-Lookup

SUSE-SU-2025:20359-1

Vulnerability from csaf_suse - Published: 2025-05-27 08:57 - Updated: 2026-09-20 18:11

Summary

Security update for unbound

Severity

Moderate

Notes

Title of the patch: Security update for unbound

Description of the patch: 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).

Patchnames: SUSE-SLE-Micro-6.1-123

CVE-2024-8508

5.8 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Affected products

Recommended 8 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:libunbound8-0:1.22.0-slfo.1.1_1.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libunbound8-0:1.22.0-slfo.1.1_1.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libunbound8-0:1.22.0-slfo.1.1_1.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libunbound8-0:1.22.0-slfo.1.1_1.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:unbound-anchor-0:1.22.0-slfo.1.1_1.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:unbound-anchor-0:1.22.0-slfo.1.1_1.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:unbound-anchor-0:1.22.0-slfo.1.1_1.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:unbound-anchor-0:1.22.0-slfo.1.1_1.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

9 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2025…	self
https://bugzilla.suse.com/1231284	self
https://www.suse.com/security/cve/CVE-2024-8508/	self
https://www.suse.com/security/cve/CVE-2024-8508	external
https://bugzilla.suse.com/1231284	external
https://bugzilla.suse.com/1265584	external

JSON

To clipboard

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  "vulnerabilities": [
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      ],
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          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
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        {
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      "remediations": [
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "date": "2025-05-27T08:57:55Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2024-8508"
    }
  ]
}

CVE-2024-8508 (GCVE-0-2024-8508)

Vulnerability from cvelistv5 – Published: 2024-10-03 16:27 – Updated: 2024-11-14 21:02

Title

Unbounded name compression could lead to Denial of Service

Summary

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.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-03 17:11 UTC

CWE

CWE-606 - Unchecked Input for Loop Condition

Assigner

NLnet Labs CNA

CNA scorecard B 82/100 over 76 records in the last 180 days details

References

3 references

URL	Tags
https://www.nlnetlabs.nl/downloads/unbound/CVE-20…	vendor-advisory
http://www.openwall.com/lists/oss-security/2024/10/04/5
https://lists.debian.org/debian-lts-announce/2024…

Impacted products

2 products

Vendor	Product	Version
NLnet Labs	Unbound	Affected: 0 , ≤ 1.21.0 (semver)
nlnetlabs	unbound	Affected: 0 , ≤ 1.21.0 (semver) cpe:2.3:a:nlnetlabs:unbound::::::::

Date Public

2024-10-03 00:00

Credits

Toshifumi Sakaguchi

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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