CVE-2024-8508

5.3 · MEDIUM

Published Oct 3, 2024 nlnetlabs CWE-606 EPSS 0.80% (54th pctl) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Overview

CVE-2024-8508 is a medium-severity vulnerability affecting nlnetlabs unbound. It was published on October 3, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical Description

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 avo

Remediation

Check the references section for vendor advisories and patches from nlnetlabs. Update unbound to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor	Product	Versions	Status
nlnetlabs	unbound	>= 0, < 1.21.1	Affected

References

Ref www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt Ref www.openwall.com/lists/oss-security/2024/10/04/5 Ref lists.debian.org/debian-lts-announce/2024/11/msg00009.html

Frequently Asked Questions

What is CVE-2024-8508?

CVE-2024-8508 is a medium-severity vulnerability affecting nlnetlabs unbound. It was published on October 3, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-8508?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-8508?

How can CyberStrike help with CVE-2024-8508?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-8508 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

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