#VU96082 NULL pointer dereference in Unbound - CVE-2024-43167

Vulnerability identifier: #VU96082

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-43167

CWE-ID: CWE-476

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 a NULL pointer dereference error within the ub_ctx_set_fwd() function. A remote attacker can send specially crafted request to the server and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Unbound: 1.0.0 - 1.20.0

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External links
https://access.redhat.com/security/cve/CVE-2024-43167
https://bugzilla.redhat.com/show_bug.cgi?id=2303456
https://github.com/NLnetLabs/unbound/issues/1072
https://github.com/NLnetLabs/unbound/pull/1073/files

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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.