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CyberSecurity Asean security alert on A Vulnerability in Apache Struts Could Allow for Remote Code Execution

This alert is originally published and can be viewed at cisecurity.org
 
OVERVIEW:
A vulnerability has been discovered in Apache Struts, which could allow for remote code execution. Apache Struts is an open-source, MVC framework for creating Java web applications. Successfully exploiting this vulnerability could allow for remote code execution in the context of the affected application. Depending on the privileges associated with the application, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights. Failed exploitation could result in a denial-of-service condition.

THREAT INTELLIGENCE:
Researchers at Tenable Security have discovered proof of concept exploit code has been made available on a GitHub repository. They also have observed active probing of sites for the existence of the remote code execution (RCE) vulnerability enumerated in CVE-2018-11776.

August 23 – UPDATED THREAT INTELLIGENCE
Researchers at Tenable Security have discovered proof of concept exploit code available on a GitHub repository for the remote code execution (RCE) vulnerability enumerated in CVE-2018-11776. They have also observed active probing of sites for this vulnerability. This vulnerability is exploitable on Apache Struts 2.3 - 2.3.34 or Struts 2.5 – 2.5.16.

SYSTEMS AFFECTED:

  • Apache Struts versions prior to 2.3.35
  • Apache Struts versions prior to 2.5.17

RISK:
Government:

  • Large and medium government entities: HIGH
  • Small government entities: HIGH

Businesses:

  • Large and medium business entities: HIGH
  • Small business entities: HIGH

Home Users: LOW

TECHNICAL SUMMARY:
A vulnerability has been discovered in Apache Struts, which could allow for remote code execution. Apache Struts is prone to a remote code-execution vulnerability (CVE-2018-11776). Specifically, this issue occurs when handling specially-crafted results with no namespace, or a URL tag without value and action set.

Successfully exploiting this vulnerability could allow for remote code execution in the context of the affected application. Depending on the privileges associated with the application, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights. Failed exploitation could result in a denial-of-service condition.

RECOMENDATIONS:
We recommend the following actions be taken:

  • Upgrade to the latest version of Apache Struts immediately, after appropriate testing.
  • Verify no unauthorized system modifications have occurred on system before applying patch.
  • Apply the principle of Least Privilege to all systems and services.
  • Remind users not to visit websites or follow links provided by unknown or untrusted sources.

REFERENCES:
CVE:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-11776

Apache:
https://cwiki.apache.org/confluence/display/WW/S2-057

August 23 – UPDATED REFERENCES: Tenable::
https://www.tenable.com/blog/new-apache-struts-vulnerability-could-allow-for-remote-code-execution
 
 

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