Vulnerabilities / Threats
1/6/2012
09:45 AM
50%
50%

New Denial Of Service Attack Cripples Servers Slowly

'Slow Read' proof-of-concept and tool released Thursday.

A researcher Thursday published proof-of-concept code that takes a different spin on the slow HTTP denial-of-service (DoS) attack simply by dragging out the process of reading the server's response--and ultimately overwhelming it.

Sergey Shekyan, senior software engineer with Qualys, also has added this new so-called Slow Read attack to his open-source slowhttptest tool.

Slow Read basically sends a legitimate HTTP request and then very slowly reads the response, thus keeping as many open connections as possible and eventually causing a DoS.

Shekyan's Slowhttptest attack tool initially was inspired by related open-source tools Slowloris and OWASP's Slow HTTP Post. Slowloris keeps connections open by sending partial HTTP requests and sends headers at regular intervals to prevent the sockets from closing, while the Slow HTTP POST distributed DoS (DDoS) tool simulates an attack using POST headers with a legitimate "content-length" field that lets the Web server know how much data is arriving. Once the headers are sent, the POST message body is transmitted slowly, thus gridlocking the connection and server resources.

Slow HTTP attacks are gaining in popularity among the bad guys as a way to quietly wage a DoS attack because these exploits are relatively easy to perform, require minimal computing resources, and often are tough to detect until it's too late.

Read the rest of this article on Dark Reading.

Read our report on how to guard your systems from a SQL attack. Download the report now. (Free registration required.)

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2012-2808
Published: 2015-04-01
The PRNG implementation in the DNS resolver in Bionic in Android before 4.1.1 incorrectly uses time and PID information during the generation of random numbers for query ID values and UDP source ports, which makes it easier for remote attackers to spoof DNS responses by guessing these numbers, a rel...

CVE-2014-9713
Published: 2015-04-01
The default slapd configuration in the Debian openldap package 2.4.23-3 through 2.4.39-1.1 allows remote authenticated users to modify the user's permissions and other user attributes via unspecified vectors.

CVE-2015-0259
Published: 2015-04-01
OpenStack Compute (Nova) before 2014.1.4, 2014.2.x before 2014.2.3, and kilo before kilo-3 does not validate the origin of websocket requests, which allows remote attackers to hijack the authentication of users for access to consoles via a crafted webpage.

CVE-2015-0800
Published: 2015-04-01
The PRNG implementation in the DNS resolver in Mozilla Firefox (aka Fennec) before 37.0 on Android does not properly generate random numbers for query ID values and UDP source ports, which makes it easier for remote attackers to spoof DNS responses by guessing these numbers, a related issue to CVE-2...

CVE-2015-0801
Published: 2015-04-01
Mozilla Firefox before 37.0, Firefox ESR 31.x before 31.6, and Thunderbird before 31.6 allow remote attackers to bypass the Same Origin Policy and execute arbitrary JavaScript code with chrome privileges via vectors involving anchor navigation, a similar issue to CVE-2015-0818.

Dark Reading Radio
Archived Dark Reading Radio
Good hackers--aka security researchers--are worried about the possible legal and professional ramifications of President Obama's new proposed crackdown on cyber criminals.