#VU96490 Heap-based buffer overflow in Unbound - CVE-2024-43168

Vulnerability identifier: #VU96490

Vulnerability 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

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Unbound
Server applications / DNS servers

Vendor: NLnet Labs

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

---

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.

Is there known malware, which exploits this vulnerability?

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