Vulnerability identifier: #VU44267

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-1193

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS Recursor
Server applications / DNS servers

Vendor: PowerDNS.COM B.V.

Description

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

The resolver in PowerDNS Recursor (aka pdns_recursor) 3.3 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

PowerDNS Recursor: 3.3

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External links
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/102729.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/104173.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/104177.html
http://www.isc.org/files/imce/ghostdomain_camera.pdf

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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.