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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.
These vulnerabilities have been found in applications written in Ruby on Rails, [2] ASP.NET MVC, [3] and Java Play framework. [4] In 2012 mass assignment on Ruby on Rails allowed bypassing of mapping restrictions and resulted in proof of concept injection of unauthorized SSH public keys into user accounts at GitHub.
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.
Based upon the generic syntax for Uniform Resource Identifiers (URI), CPE includes a formal name format, a method for checking names against a system, and a description format for binding text and tests to a name. [1] The CPE Product Dictionary provides an agreed upon list of official CPE names.
MsgServerDocWiki: (now off-line) contained documentation, FAQ and tips for installation, configuration, operation, and troubleshooting of Sun Java System Messaging Server; Factotum: a blog written by a Messaging Server tech writer. Provides some inside information and sneak preview of what's to come in future releases.
The feature causing the vulnerability could be disabled with a configuration setting, which had been removed [51] in Log4j version 2.15.0-rc1 (officially released on December 6, 2021, three days before the vulnerability was published), and replaced by various settings restricting remote lookups, thereby mitigating the vulnerability.
The start of the format string is crafted to contain the address that the %n format token can then overwrite with the address of the malicious code to execute. This is a common vulnerability because format bugs were previously thought harmless and resulted in vulnerabilities in many common tools.