A Vulnerability in Apache Struts Could Allow for Remote Code Execution

ITS Advisory Number: 
2022-056
Date(s) Issued: 
Tuesday, April 19, 2022
Subject: 
A Vulnerability in Apache Struts Could Allow for Remote Code Execution
Overview: 

A vulnerability has been discovered in Apache Struts, which could allow for remote code execution. Apache Struts is an open source framework used for building Java web applications. Successful exploitation of this vulnerability could allow for remote code execution. Depending on the privileges associated with the user, an attacker could then install programs; view; change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:

There are currently no reports of this vulnerability being exploited in the wild.

 

Systems Affected: 
  • Apache Struts versions prior to 2.5.30 
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
Low
Description: 

A vulnerability has been discovered in Apache Struts, which could allow for remote code execution. This vulnerability exists due to some of the tag attributes performing 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 remote code execution and security degradation. Successful exploitation of the most severe of this vulnerability could allow an attacker to execute arbitrary code in the context of the browser. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of this vulnerability could have less impact than if it was configured with administrative rights.

Actions: 

We recommend the following actions be taken:

  • Upgrade to the most recent version of Apache Struts after appropriate testing.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Verify no unauthorized system modifications have occurred on the system before applying the patch.