#VU87205 Infinite loop in Unbound - CVE-2024-1931

Vulnerability identifier: #VU87205

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-1931

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Unbound
Server applications / DNS servers

Vendor: NLnet Labs

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in EDE support when trimming EDE text on
positive replies. A remote attacker can consume all available system resources and cause denial of service conditions.

Successful exploitation of the vulnerability requires enabled support for EDE (not a default option).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Unbound: 1.18.0 rc1 - 1.19.1

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External links
https://github.com/NLnetLabs/unbound/releases/tag/release-1.19.2

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.