CVE-2011-3923 Struts ParameterInterceptor vulnerability allows remote command execution

What is CVE-2011-3923?

CVE-2011-3923 is a critical command injection vulnerability in Apache Struts, published on 1 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Apache Struts before 2.3.1.2 allows remote attackers to bypass security protections in the ParameterInterceptor class and execute arbitrary commands.

Weakness: CWE-732

Which versions are affected by CVE-2011-3923?

2 open source packages ship an affected version, including org.apache.struts:struts2-core. It affects 2 products.

Products include Apache Struts, Redhat Jboss Enterprise Web Server.

How do I fix CVE-2011-3923?

Upgrade org.apache.struts:struts2-core to 2.3.1.2 or later.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2011-3923 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-3923 exists.

Public exploit code: 1 Metasploit module and 1 Exploit-DB entry.

Other vulnerabilities in Apache Struts

• CVE-2020-17530 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2017-9791 Apache Struts 1 Improper Input Validation Exploited Critical 9.8
• CVE-2017-5638 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2012-0391 Apache Struts 2 Improper Input Validation Exploited Critical 9.8
• CVE-2018-11776 Apache Struts Remote Code Execution Exploited High 8.1

All Apache Struts vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-j68f-8h6p-9h5q.