Denial of service in Unbound

1) NULL pointer dereference

EUVDB-ID: #VU96082

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-43167

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

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 rc1

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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