What is slow HTTP POST vulnerability?

A variation of this vulnerability is the slow HTTP POST vulnerability. In a slow HTTP POST attack, the attacker declares a large amount of data to be sent in an HTTP POST request and then sends it very slowly. A malicious user can open many connections to the server by initiating HTTP requests but not closing them.

How does a slow loris attack work?

Slowloris is an application layer attack which operates by utilizing partial HTTP requests. The attack functions by opening connections to a targeted Web server and then keeping those connections open as long as it can. It falls in the category of attacks known as “low and slow” attacks.

What are the 3 types of DDoS attacks?

Broadly speaking, DoS and DDoS attacks can be divided into three types:

Volume Based Attacks. Includes UDP floods, ICMP floods, and other spoofed-packet floods.
Protocol Attacks. Includes SYN floods, fragmented packet attacks, Ping of Death, Smurf DDoS and more.
Application Layer Attacks.

How can you tell a slow loris attack?

Slowloris attacks work by sending request data as slow as possible. Therefore, if you could measure the bandwidth use per ip address then if it’s below some threshold, (found by measuring the bandwidth in a known slowloris attack) then you know you are under attack.

How do I fix slow HTTP POST vulnerability?

Identifying Slow HTTP Attack Vulnerabilities on Web Application….Protection Strategies

Reject / drop connections with HTTP methods (verbs) not supported by the URL.
Limit the header and message body to a minimal reasonable length.
Set an absolute connection timeout, if possible.

How do you test a slow HTTP POST vulnerability?

Slow HTTP DoS vulnerability test tool

Slowing down either the header or the body section of the request.
Any HTTP verb can be used in the request.
Configurable Content-Length header.
Random size of follow-up chunks, limited by optional value.
Random header names and values.
Random message body data.

Is DDoS illegal?

For example, a DDoS attack may constitute a federal criminal offense under the Computer Fraud and Abuse Act, a trespass to chattel, or a breach of contract if it violates a website owner’s or internet service provider’s terms of use.

How do you stop a slow loris attack?

Slowloris DDoS attacks can be mitigated by following the following steps:

Increase the maximum number of clients the Web server will allow.
Limit the number of connections a single IP address is allowed to attempt.
Place restrictions on the minimum transfer speed a connection is allowed.

What is the strongest DDoS method?

DNS Flood. One of the most well-known DDoS attacks, this version of UDP flood attack is application specific – DNS servers in this case. It is also one of the toughest DDoS attacks to detect and prevent.

What is slow read attack?

A slow read DDoS attack involves an attacker sending an appropriate HTTP request to a server, but then reading the response at a very slow speed, if at all. By reading the response slowly – sometimes as slow as one byte at a time – the attacker prevents the server from incurring an idle connection timeout.

What kind of HTTP denial of service attack?

A slow HTTP Denial of Service attack (DoS), otherwise referred to as the Slowloris HTTP attack, makes use of HTTP GET requests to occupy all available HTTP connections permitted by a web server.

What kind of attack is a slow HTTP request?

Slow HTTP attacks are denial-of-service (DoS) attacks in which the attacker sends HTTP requests in pieces slowly, one at a time to a Web server. If an HTTP request is not complete, or if the transfer rate is very low, the server keeps its resources busy waiting for the rest of the data.

Can a Slow DoS attack work on Apache?

The HTTP request will seem legitimate to the IDS. Slow HTTP DoS attacks are only effective against thread-based web servers such as Apache, dhttpd, or Microsoft IIS. They are not effective against event-based web servers such as nginx and lighttpd, which are built to handle large numbers of concurrent connections.

Is there an HTTP DoS attack for Slowloris?

Slowloris perl script http dos attack and its usage. You can find the slowloris script from ha.ckers.org. Copy the script and run it against any of your web server for testing. Most of the apache web server’s are vulnerable against this kind of an attack. The usage of the script is quite simple as shown below.