Description
vBulletin versions 5.5.4 through 5.6.2 allows remote command execution via a crafted subWidgets POST data to /ajax/render/widget_tabbedcontainer_tab_panel. This vulnerability is a bypass of the fix for the previous vulnerability, CVE-2019-16759, which allows attackers to send a crafted HTTP request with a specified template name and malicious PHP code, and leads to remote code execution.
Remediation
Upgrade to the latest version of vBulletin.
References
Exploiting vBulletin: "A Tale of a Patch Fail"
Exploits in the Wild for vBulletin Pre-Auth RCE Vulnerability CVE-2020-17496
Related Vulnerabilities
Oracle WebLogic Remote Code Execution via T3
Microsoft Exchange Server Pre-auth Path Confusion vulnerability (CVE-2021-34473)
Apache Struts 2 ClassLoader manipulation and denial of service (S2-020)
WordPress Plugin Newsletter Subscription Form Possible Remote Code Execution (1.1.2)
Oracle Weblogic Async Component Deserialization RCE CVE-2019-2725