The Spring Framework is a lightweight Open source application framework that gives infrastructure for developing java application.Java applications are vulnerable to spring4shell. Using the vulnerability they compromised a huge number of servers
An attacker could exploit Spring4Shell by sending a crafted request to a
vulnerable server. However, exploitation of Spring4Shell requires certain
prerequisites, whereas the first Log4Shell vulnerability affected all versions of
Log4j 2 using the default configuration.
According to Spring, the subsequent requirements were included within the vulnerability report, however the post cautions that there could also be other ways during which this will be exploited so this might not be an entire list of requirements at this time:
There are two vulnerabilities in the spring framework that allow malicious actors to achieve remote code execution (RCE).
To detect exploitation attempts, make sure that Advanced Exploit Prevention and Network Attack Blocker features are enabled. Some techniques used during exploitation are often seen in other exploits that we detect, which is why the decision names can differ.To mitigate risk, upgrade to the newest versions to deal with the Spring4Shell vulnerabilities:
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