Ubuntu update for unbound

1) NULL pointer dereference

EUVDB-ID: #VU96082

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 - 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

Update the affected package unbound to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 24.04

libunbound2 (Ubuntu package): before Ubuntu Pro

unbound-host (Ubuntu package): before Ubuntu Pro

unbound (Ubuntu package): before Ubuntu Pro

libunbound8 (Ubuntu package): before 1.9.4-2ubuntu1.8

CPE2.3

• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:libunbound2_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:unbound-host_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:unbound_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libunbound8_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-6998-1

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.

2) 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

Update the affected package unbound to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 24.04

libunbound2 (Ubuntu package): before Ubuntu Pro

unbound-host (Ubuntu package): before Ubuntu Pro

unbound (Ubuntu package): before Ubuntu Pro

libunbound8 (Ubuntu package): before 1.9.4-2ubuntu1.8

CPE2.3

• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:libunbound2_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:unbound-host_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:unbound_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:libunbound8_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-6998-1

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.