Unbound Version 1.21.0-1.21.1 Vulnerability: Large RRset Name Compression Attack
CVE-2024-8508

5.3MEDIUM

Key Information:

Vendor

Nlnet Labs

Status
Unbound
Vendor
CVE Published:
3 October 2024

What is CVE-2024-8508?

The vulnerability in NLnet Labs Unbound arises from its processing of replies containing very large resource record sets (RRsets), which necessitate name compression. This flaw allows malicious actors to send specially crafted DNS responses that prompt Unbound to perform extensive name compression operations. As a result, the server may experience prolonged CPU utilization, leading to degraded performance and potential denial of service during targeted attacks. The issue is effectively mitigated in Unbound version 1.21.1, where a hard cap has been established on the number of name compression calculations conducted per packet. This solution protects the server from locking the CPU for excessive periods while still permitting normal DNS traffic handling.

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Affected Version(s)

Unbound 0 <= 1.21.0

References

https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt
vendor-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

Credit

Toshifumi Sakaguchi
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