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Test ID:1.3.6.1.4.1.25623.1.0.103718
Category:Denial of Service
Title:DNS Amplification Attacks (UDP)
Summary:A misconfigured Domain Name System (DNS) server can be exploited; to participate in a Distributed Denial of Service (DDoS) attack.
Description:Summary:
A misconfigured Domain Name System (DNS) server can be exploited
to participate in a Distributed Denial of Service (DDoS) attack.

Vulnerability Insight:
A Domain Name Server (DNS)Amplification attack is a popular form
of Distributed Denial of Service (DDoS) that relies on the use of publicly accessible open
recursive DNS servers to overwhelm a victim system with DNS response traffic.

The basic attack technique consists of an attacker sending a DNS name lookup request to an open
recursive DNS server with the source address spoofed to be the victim's address. When the DNS
server sends the DNS record response, it is sent instead to the victim. Attackers will typically
submit a request for as much zone information as possible to maximize the amplification effect.
Because the size of the response is typically considerably larger than the request, the attacker
is able to amplify the volume of traffic directed at the victim. By leveraging a botnet to perform
additional spoofed DNS queries, an attacker can produce an overwhelming amount of traffic with
little effort. Additionally, because the responses are legitimate data coming from valid servers,
it is especially difficult to block these types of attacks.

Solution:
No known solution was made available for at least one year
since the disclosure of this vulnerability. Likely none will be provided anymore. General solution
options are to upgrade to a newer release, disable respective features, remove the product or
replace the product by another one.

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2006-0987
Bugtraq: 20060228 recursive DNS servers DDoS as a growing DDoS problem (Google Search)
http://www.securityfocus.com/archive/1/426368/100/0/threaded
http://dns.measurement-factory.com/surveys/sum1.html
http://www.us-cert.gov/reading_room/DNS-recursion121605.pdf
CopyrightCopyright (C) 2013 Greenbone Networks GmbH

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