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.
Published: 2014-07-22 Multiple cross-site scripting (XSS) vulnerabilities in the web UI in Sophos Anti-Virus for Linux before 9.6.1 allow local users to inject arbitrary web script or HTML via the (1) newListList:ExcludeFileOnExpression, (2) newListList:ExcludeFilesystems, or (3) newListList:ExcludeMountPaths parameter t...
Published: 2014-07-22 jmx-remoting.sar in JBoss Remoting, as used in Red Hat JBoss Enterprise Application Platform (JEAP) 5.2.0, Red Hat JBoss BRMS 5.3.1, Red Hat JBoss Portal Platform 5.2.2, and Red Hat JBoss SOA Platform 5.3.1, does not properly implement the JSR 160 specification, which allows remote attackers to exec...
Published: 2014-07-22 The org.picketlink.common.util.DocumentUtil.getDocumentBuilderFactory method in PicketLink, as used in Red Hat JBoss Enterprise Application Platform (JBEAP) 5.2.0 and 6.2.4, expands entity references, which allows remote attackers to read arbitrary code and possibly have other unspecified impact via...
Published: 2014-07-22 Elasticsearch Logstash 1.0.14 through 1.4.x before 1.4.2 allows remote attackers to execute arbitrary commands via a crafted event in (1) zabbix.rb or (2) nagios_nsca.rb in outputs/.