Package Instance

DoS attack via crafted XML payload processed by REST Plugin using XStream library
The REST Plugin in this package is using an outdated XStream library which is vulnerable and allow perform a DoS attack using malicious request with specially crafted XML payload.

Incomplete Cleanup
When a Multipart request is performed but some of the fields exceed the maxStringLength  limit, the upload files will remain in struts.multipart.saveDir  even if the request has been denied.
Users are recommended to upgrade to versions Struts 2.5.32 or 6.1.2.2 or Struts 6.3.0.1 or greater, which fixe this issue.

RCE attack via REST plugin with XStream handler to deserialise XML requests
The REST Plugin in this package uses an `XStreamHandler` with an instance of `XStream` for deserialization without any type filtering, which can lead to Remote Code Execution when deserializing XML payloads.

Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.

Improper Input Validation
The Apache Struts REST Plugin XStream library allow attackers to perform a DoS attack when using a malicious request with specially crafted XML payload.

DoS vulnerability
The REST Plugin is using an outdated JSON-lib library which is vulnerable and allow perform a DoS attack using malicious request with specially crafted JSON payload.

Files or Directories Accessible to External Parties
An attacker can manipulate file upload params to enable paths traversal and under some circumstances this can lead to uploading a malicious file which can be used to perform Remote Code Execution.
Users are recommended to upgrade to versions Struts 2.5.33 or Struts 6.3.0.2 or greater to fix this issue.

Remote code execution in Apache Struts
Forced OGNL evaluation, when evaluated on raw user input in tag attributes, may lead to remote code execution.