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DNS Amplification Attacks

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Wont Fix

Created

Created

10 years ago

Modified

Modified

5 years ago

Summary

A misconfigured Domain Name System (DNS)server can be exploited to participate in a Distributed Denial of Service (DDoS) attack.

Insight

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

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.

Common Vulnerabilities and Exposures (CVE)