CVE-2018-11776

CVE-2018-11776 is a high-severity (CVSS 8.1) vulnerability in Apache Struts. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA does not currently list it as used in ransomware campaigns. Apache has 41 vulnerabilities in the KEV catalog, 8 of them linked to ransomware.

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

• http://packetstormsecurity.com/files/172830/Apache-Struts-Remote-Code-Execution.html
• http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-005.txt
• http://www.oracle.com/technetwork/security-advisory/alert-cve-2018-11776-5072787.html
• http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
• http://www.securityfocus.com/bid/105125
• http://www.securitytracker.com/id/1041547
• http://www.securitytracker.com/id/1041888
• https://cwiki.apache.org/confluence/display/WW/S2-057