RCE via stale global state

PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).

A vulnerability has been identified in Spectrum Power 3 (Corporate User Interface) (All versions <= v3.11), Spectrum Power 4 (Corporate User Interface) (Version v4.75), Spectrum Power 5 (Corporate User Interface) (All versions < v5.50), Spectrum Power 7 (Corporate User Interface) (All versions <= v2.20). The web server could allow Cross-Site Scripting (XSS) attacks if unsuspecting users are tricked into accessing a malicious link. User interaction is required for a successful exploitation. The user does not need to be logged into the web interface in order for the exploitation to succeed.At the stage of publishing this security advisory no public exploitation is known.