Unbound DNS Resolver Remote Denial of Service Vulnerability

BID:47986

Info

Unbound DNS Resolver Remote Denial of Service Vulnerability

Bugtraq ID: 47986
Class: Race Condition Error
CVE: CVE-2011-1922
Remote: Yes
Local: No
Published: May 25 2011 12:00AM
Updated: Apr 13 2015 08:58PM
Credit: Christopher Olah
Vulnerable: Unbound Unbound 1.4.9
Unbound Unbound 1.4.3
Unbound Unbound 1.4.2
Unbound Unbound 1.3.4
Unbound Unbound 1.3.3
Gentoo Linux
Not Vulnerable: Unbound Unbound 1.4.10

Discussion

Unbound DNS Resolver Remote Denial of Service Vulnerability

Unbound is prone to a remote denial-of-service vulnerability.

Successfully exploiting this issue allows remote attackers to crash the server, denying further service to legitimate users.

Versions prior to Unbound 1.4.10 are vulnerable.

Exploit / POC

Unbound DNS Resolver Remote Denial of Service Vulnerability

An attacker can use readily available network utilities.

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