CVE-2024-8508

Published Oct 3, 2024

Last updated a year ago

CVSS medium 5.3

Overview

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 avoid locking the CPU for long. This change should not affect normal DNS traffic.
Source
sep@nlnetlabs.nl
NVD status
Analyzed
Products
unbound, debian_linux

Risk scores

CVSS 3.1

Type
Primary
Base score
5.3
Impact score
1.4
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Severity
MEDIUM

Weaknesses

sep@nlnetlabs.nl
CWE-606
nvd@nist.gov
CWE-1284

Social media

Hype score
Not currently trending

  1. UnboundのDoS脆弱性CVE-2024-8508 のお話https://t.co/nMG8dRzcFN ラベルを多く含むドメイン名をたくさん持つRRSetを応答させることにより、フルリゾルバのCPU能力を使い果たし、応答遅延や不能を引き起こすことができます。

    @siskrn

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Configurations

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References

Sources include official advisories and independent security research.