Denial of Service (DoS) Affecting org.apache.struts:struts2-core Open this link in a new tab package, versions [2.3.7,2.3.34) [2.5,2.5.13)
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12 Sep 2017
23 Aug 2017
Adam Cazzolla, Jonathan Bullock
How to fix?
org.apache.struts:struts2-core to version 2.3.34, 2.5.13 or higher.
Apache Struts2 is a popular open-source framework for developing web applications in the Java programming language.
Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) attacks. This is due to an incomplete fix for CVE-2017-7672. If an application allows enter an URL in a form field and built-in URLValidator is used, it is possible to prepare a special URL which will be used to overload server process when performing validation of the URL.
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm