Privilege escalation in Unbound

1) Heap-based buffer overflow

EUVDB-ID: #VU96490

Risk: Low

CVSSv4.0: 5.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-43168

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the cfg_mark_ports() function in config_file.c. A local user can pass a specially crafted file to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Unbound: 1.0.0 - 1.19.3

CPE2.3

• cpe:2.3:a:unbound_net:unbound:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:unbound_net:unbound:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:unbound_net:unbound:1.0.2:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=2303462
https://github.com/NLnetLabs/unbound/issues/1039
https://github.com/NLnetLabs/unbound/pull/1040/files

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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