Input validation error in Unbound

1) Input validation error

EUVDB-ID: #VU44266

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-1192

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate or delete data.

The resolver in Unbound before 1.4.11 overwrites cached server names and TTL values in NS records during the processing of a response to an A record query, which allows remote attackers to trigger continued resolvability of revoked domain names via a "ghost domain names" attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Unbound: 0.0 - 1.4.9

CPE2.3

• cpe:2.3:a:unbound_net:unbound:0.0:*:*:*:*:*:*:*
• cpe:2.3:a:unbound_net:unbound:0.1:*:*:*:*:*:*:*
• cpe:2.3:a:unbound_net:unbound:0.2:*:*:*:*:*:*:*

External links

https://www.isc.org/files/imce/ghostdomain_camera.pdf

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.