Vulnerability Overview

Recently, Apache Software Foundation (ASF) has released a security advisory to strongly advise users of Apache Struts2.3.X to upgrade the Apache Commons FileUpload component. Struts 2.3.x, by default, uses the Commons FileUpload component of V1.3.2. Early in 2016, this component of V1.3.2 is disclosed to contain a deserialization vulnerability (CVE-2016-100031) which could result in arbitrary code execution.

Commons is a Java subproject of ASF and FileUpload is a subproject for handling HTTP file uploads. The Commons FileUpload component is mainly used to assist developers in implementing the web file upload function.

Reference link:

https://mail-archives.us.apache.org/mod_mbox/www-announce/201811.mbox/%3CCAMopvkMo8WiP%3DfqVQuZ1Fyx%3D6CGz0Epzfe0gG5XAqP1wdJCoBQ%40mail.gmail.com%3E

Scope of Impact

Affected Versions

  • Apache Struts <= 2.3.36
  • Apache Common FileUpload < 1.3.3

Unaffected Versions

  • Apache Struts >= 2.5.12
  • Apache Common FileUpload 1.3.3

Vulnerability Check

  • Version Check

This vulnerability exists in the Commons FileUpload component in Apache Struct2 of earlier versions. Application systems that use this component are susceptible to remote attacks. Therefore, application developers are advised to check whether this component used in Apache Struct 2 is vulnerable.

Check the version of this component in the Maven configuration file pom.xml as follows:

<dependency>

<groupId>commons-fileupload</groupId>

<artifactId>commons-fileupload</artifactId>

<version>1.3.2</version>

</dependency>

 

If the component version indicated in red is vulnerable, users should upgrade the Common FileUpload component to an unaffected version for long-term effective protection.

Vulnerability Protection

  • Official Update

A new version has been released officially to fix this vulnerability. Users of Apache Struts 2.3.x should upgrade this framework or the Common FileUpload component to the latest version as soon as possible to prevent risks brought by this vulnerability.

  • Offline Update of the Common FileUpload Component

Users can replace the current the Common FileUpload library with a patched version for protection against this vulnerability. The detailed procedure is as follows:

  1. Download the Common FileUpload library V1.3.3 from the following address:

http://mirrors.hust.edu.cn/apache//commons/fileupload/binaries/commons-fileupload-1.3.3-bin.zip

  1. Use the patched version to replace the earlier version of the component under WEB-INF/lib.
  2. Restart middleware applications such as Tomcat and WebLogic.
  • Application Recompilation for Update

Developers can recompile the application to update the Common FileUpload component by updating the Maven or Gradle configuration:

Maven configuration

<!– https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload –>

<dependency>

<groupId>commons-fileupload</groupId>

<artifactId>commons-fileupload</artifactId>

<version>1.3.3</version>

</dependency>

 

Gradle configuration

// https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload

compile group: ‘commons-fileupload’, name: ‘commons-fileupload’, version: ‘1.3.3

 

Statement

This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.

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