Ubuntu update for unbound



Published: 2022-11-18
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-3204
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Ubuntu
Operating systems & Components / Operating system

libunbound2 (Ubuntu package)
Operating systems & Components / Operating system package or component

libunbound8 (Ubuntu package)
Operating systems & Components / Operating system package or component

unbound (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU69407

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-2022-3204

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing a malicious delegation with a considerable number of non responsive nameservers. A remote attacker can trigger CPU high usage and perform a denial of service (DoS) attack.

The attack is known as "Non-Responsive Delegation Attack" (NRDelegation Attack).

Mitigation

Update the affected package unbound to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

libunbound2 (Ubuntu package): before 1.6.7-1ubuntu2.6

libunbound8 (Ubuntu package): before 1.16.2-1ubuntu0.1

unbound (Ubuntu package): before 1.16.2-1ubuntu0.1

External links

http://ubuntu.com/security/notices/USN-5732-1


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.



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