Spencer McIntyre

“We haven't identified another public or commercial exploit that achieves this under the same conditions. Developing this capability was far from trivial, but it demonstrates that a major barrier to exploiting PHP2Shell on production-configured systems can be overcome.”

Spencer McIntyre · said date not stated · reported 2026-10-23

Spencer McIntyre stated VulnCheck's exploit is unique in achieving RCE under PHP's recommended production conditions.

“Our team developed a novel technique [...] that chains the two vulnerabilities together, using a memory leak to bypass ASLR and achieve remote code execution on x86-64 systems, even with PHP's recommended production error-display setting.”

Spencer McIntyre · said date not stated · reported 2026-10-23

Spencer McIntyre described a novel technique developed by VulnCheck to bypass ASLR and achieve RCE on x86-64 systems.

“An attacker doesn't necessarily need administrator or root access to cause significant damage,”

Spencer McIntyre · said date not stated · reported 2026-10-23

Spencer McIntyre warned that attackers do not need root access to cause significant damage via PHP2Shell.

“One of the biggest obstacles has been address space layout randomization (ASLR), a protection designed to make memory corruption vulnerabilities much harder to exploit,”

Spencer McIntyre · said date not stated · reported 2026-10-23

Spencer McIntyre identified ASLR as a major obstacle in exploiting PHP2Shell vulnerabilities.

“Access to a vulnerable web application could provide a foothold into other parts of an organization's infrastructure.”

Spencer McIntyre · said date not stated · reported 2026-10-23

Spencer McIntyre explained that compromising a vulnerable web application could give attackers a foothold into broader infrastructure.