Inside the PHP2SHELL Exploit: A Red Team Perspective | After Hours
Source: YouTube · HaxrByte · published Oct 26, 2026 · 1:18:30
BLUF:
The "PHP2 Shell" vulnerability (CVE-2024-109618 and CVE-2024-109619) represents a critical, unauthenticated remote code execution risk in the PHP core runtime, affecting major applications like WordPress and Drupal 12:57. Security researchers discovered these flaws via AI-assisted audits, prompting an urgent patch release and highlighting that clean application code does not guarantee runtime safety 22:50.
Key Takeaways:
• Two Critical Flaws: The vulnerability consists of an out-of-memory corruption bug (CVE-2024-109618) and a stale global state pointer bug (CVE-2024-109619), both allowing attackers to execute code without authentication 22:50.
• Massive Exposure: Unit 42 estimates that over 22.6 million internet-facing instances are potentially vulnerable, as the bug resides in the PHP runtime layer beneath popular platforms like WordPress, Drupal, and Joomla 48:00.
• Exploitation Mechanics: Attackers can trigger the memory corruption via nested multipart requests or use stale pointers in FPM workers to execute code before application-level security checks can intervene 35:45.
• Immediate Remediation Required: PHP has released fixed versions (8.2.35, 8.3.36, 8.4.27, and 8.5.12). Organizations must update their PHP builds and restart all worker processes, as patching the binary on disk does not affect running instances 25:56.
• Active Threat Landscape: While no widespread confirmed breaches were reported as of late October, AWS and Cloudflare detected active probing and exploitation attempts shortly after the vulnerability's disclosure 43:00.
The PHP2 Shell incident underscores the importance of securing the underlying runtime environment, not just application code. Defenders should prioritize patching and monitoring for signs of memory-related anomalies in web servers.
Sources:
- 12:57 Introduction of the PHP2 Shell nickname and the two critical CVEs.
- 22:50 Detailed explanation of the out-of-memory corruption and stale pointer bugs.
- 25:56 List of fixed PHP versions and the necessity of restarting workers.
- 35:45 Technical details on how the memory corruption is triggered via multipart requests.
- 43:00 Report on AWS and Cloudflare detecting active exploitation attempts.
- 48:00 Statistics from Unit 42 regarding the number of exposed instances.
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First 800 characters of the transcript
Welcome to After Hours in the Ghost Shell, the live cyber security discussion with Axabyte on Sundays at 700 p.m. Central. I'm Axabyte. I've spent 20 years working in cyber security penetration testing and red team operations and welcome everyone. So good to see you here. Um if I check in the chat. So Agent 57, good to see you. You are definitely first on Twitch, but Mutuba was first on YouTube. So congratulations. Um and yes, you're right. It's been it's been a while. So, um, just to let you guys know what's what's happening tonight. So, I wasn't planning on streaming. I'm actually busy working on a or [clears throat] well, I was planning to do a a YouTube video on um PHP2 shell. Uh, I'm sure you guys heard heard some some ramblings in the media about that. And the idea is to just switch …