Resource management error in Unbound

1) Resource management error

EUVDB-ID: #VU45005

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2009-4008

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Unbound: 0.0 - 1.4.2

External links

http://packages.debian.org/changelogs/pool/main/u/unbound/unbound_1.4.6-1/changelog
http://unbound.nlnetlabs.nl/downloads/unbound-1.4.4.tar.gz
http://www.debian.org/security/2011/dsa-2243

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.