When using expression literals or forcing expression in Freemarker tags (see example below) and using request values, it can lead to RCE attack. <@s.hidden name="redirectUri" value=redirectUri /> <@s.hidden name="redirectUri" value="${redirectUri}" /> In both cases a writable property is used in the value attribute and in both cases this is threatened as an expression by Freemarker. Affected versions: Struts 2.0.1 - Struts 2.3.33, Struts 2.5 - Struts 2.5.10 External References: https://struts.apache.org/docs/s2-053.html
Statement: A previous statement by Red Hat related to this CVE, prior to August 2019, said that Apache Struts 2 is not included in any Red Hat products. This earlier statement was incorrect. While Struts 2 is not actively compiled, shipped, used, or enabled in any Red Hat provided final products, and does not cause any vulnerability in the product, struts2-core jars have been included in some products' source code packages. The inclusion was part of an import of the Google Guice repository, which includes struts2-core. Customers that build artefacts from our source code could be at risk. Red Hat will remove these artefacts from source code in future releases. The products that included the Struts 2 artefacts in their source jars: Fuse Service Works 6.0.0 Single Sign On 7.3.0+ If you have used the source package from one of these products to build artefacts on your system, you should do the following to remove potentially affected jars: 1. Run 'find . -name struts2*.jar' under the source location 2. Remove any files found This will not affect the product, as the jar is included with the source of google-guice, but no functionality requiring struts2 is implemented.