CVE-2024-33655
First published: Fri May 10 2024(Updated: )
The DNS protocol in RFC 1035 and updates allows remote attackers to cause a denial of service (resource consumption) by arranging for DNS queries to be accumulated for seconds, such that responses are later sent in a pulsing burst (which can be considered traffic amplification in some cases), aka the "DNSBomb" issue.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/unbound | <1.9.4-2ubuntu1.6 | 1.9.4-2ubuntu1.6 |
| ubuntu/unbound | <1.13.1-1ubuntu5.5 | 1.13.1-1ubuntu5.5 |
| ubuntu/unbound | <1.17.1-2ubuntu0.2 | 1.17.1-2ubuntu0.2 |
| ubuntu/unbound | <1.19.2-1ubuntu3.1 | 1.19.2-1ubuntu3.1 |
| ubuntu/unbound | <1.20.0-1 | 1.20.0-1 |
| debian/unbound | <=1.9.0-2+deb10u2<=1.9.0-2+deb10u4<=1.13.1-1+deb11u1<=1.13.1-1+deb11u2<=1.17.1-2+deb12u1<=1.17.1-2+deb12u2 | 1.20.0-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2024-33655
- https://nlnetlabs.nl/downloads/unbound/CVE-2024-33655.txt
- https://ubuntu.com/security/notices/USN-6791-1
- https://nvd.nist.gov/vuln/detail/CVE-2024-33655
- https://launchpad.net/bugs/cve/CVE-2024-33655
- https://security-tracker.debian.org/tracker/CVE-2024-33655
- https://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
- https://ubuntu.com/security/CVE-2024-33655
- https://alas.aws.amazon.com/ALAS-2024-1934.html
- https://datatracker.ietf.org/doc/html/rfc1035
- https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-120
- https://gitlab.isc.org/isc-projects/bind9/-/issues/4398
- https://meterpreter.org/researchers-uncover-dnsbomb-a-new-pdos-attack-exploiting-legitimate-dns-features/
- https://nlnetlabs.nl/projects/unbound/security-advisories/
- https://sp2024.ieee-security.org/accepted-papers.html
- https://www.isc.org/blogs/2024-dnsbomb/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/
Frequently Asked Questions
What is the severity of CVE-2024-33655?
CVE-2024-33655 is classified as a denial of service vulnerability that can lead to resource consumption.
How do I fix CVE-2024-33655?
To fix CVE-2024-33655, update the unbound package to version 1.9.4-2ubuntu1.6 or higher for Ubuntu, or the corresponding version for Debian.
Which versions of unbound are affected by CVE-2024-33655?
Affected versions of unbound include versions earlier than 1.9.4-2ubuntu1.6 for Ubuntu and lower than 1.20.0-1 for Debian.
Can CVE-2024-33655 be exploited remotely?
Yes, CVE-2024-33655 can be exploited by remote attackers through manipulated DNS queries.
What are the potential impacts of CVE-2024-33655?
The primary impact of CVE-2024-33655 is service disruption due to resource exhaustion caused by a burst of DNS responses.
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