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Log4Shell (CVE-2021-44228) is a zero-day vulnerability reported in November 2021 in Log4j, a popular Java logging framework, involving arbitrary code execution. [2] [3] The vulnerability had existed unnoticed since 2013 and was privately disclosed to the Apache Software Foundation, of which Log4j is a project, by Chen Zhaojun of Alibaba Cloud's security team on 24 November 2021.
The Java software platform provides a number of features designed for improving the security of Java applications. This includes enforcing runtime constraints through the use of the Java Virtual Machine (JVM), a security manager that sandboxes untrusted code from the rest of the operating system, and a suite of security APIs that Java developers can utilise.
The Java programming language and Java software platform have been criticized for design choices including the implementation of generics, forced object-oriented programming, the handling of unsigned numbers, the implementation of floating-point arithmetic, and a history of security vulnerabilities in the primary Java VM implementation, HotSpot.
This type of vulnerability would be bad enough if it was limited to just one product or brand. But because Log4j is such a ubiquitous technology, the effect of this will be exponentially higher.
Property lookup support for values defined in the configuration file, system properties, environment variables, the ThreadContext Map, and data present in the event Support for multiple APIs: Log4j 2 can be used with applications using the Log4j 2, Log4j 1.2, SLF4J, Commons Logging and java.util.logging (JUL) APIs.
Insecure direct object reference (IDOR) is a type of access control vulnerability in digital security. [ 1 ] This can occur when a web application or application programming interface uses an identifier for direct access to an object in an internal database but does not check for access control or authentication .
A remote code execution vulnerability affecting certain versions of Spring Framework was published in April 2022 under CVE-2022-22965. It was given the name Spring4Shell in reference to the recent Log4Shell vulnerability, both having similar proofs-of-concept in which attackers could on vulnerable machines, gain shell access [129] or even full ...
Java has an expressive system of references and allows for special behavior for garbage collection. A normal reference in Java is known as a "strong reference". The java.lang.ref package defines three other types of references—soft, weak, and phantom references. Each type of reference is designed for a specific use.