Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape
Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape
AI Analysis
Technical Summary
The identified security threat is a sandbox escape vulnerability in the Microsoft Edge Renderer Process, specifically involving the Mojo IPC component in version 134.0.6998.177. The sandbox is a critical security mechanism that isolates the browser's rendering engine from the underlying operating system to prevent malicious web content from executing arbitrary code or accessing sensitive system resources. This vulnerability enables an attacker to bypass these sandbox restrictions, effectively escaping the confined environment. The exploit leverages flaws in the inter-process communication (IPC) mechanism used by Edge's renderer processes, allowing malicious code to execute with higher privileges on the host machine. The presence of publicly available exploit code written in Perl indicates that the vulnerability could be weaponized by attackers with moderate technical skills. Although there are no known exploits in the wild currently, the availability of exploit code increases the risk of future attacks. The lack of official patches or updates at the time of reporting means systems remain vulnerable. This vulnerability can lead to unauthorized code execution, potentially allowing attackers to install malware, steal data, or disrupt system operations. The exploit does not require user interaction, increasing its threat level. The absence of a CVSS score necessitates an independent severity assessment, which considers the impact on confidentiality, integrity, and availability, as well as ease of exploitation and scope of affected systems.
Potential Impact
For European organizations, this vulnerability poses significant risks including unauthorized access to sensitive information, potential deployment of persistent malware, and disruption of business-critical applications. Organizations relying heavily on Microsoft Edge for web access, especially those in sectors like finance, government, and critical infrastructure, could face targeted attacks aiming to exploit this sandbox escape. The ability to execute code outside the sandbox can lead to full system compromise, data breaches, and lateral movement within corporate networks. Given the widespread adoption of Microsoft Edge across Europe, the vulnerability could affect a broad range of enterprises and public sector entities. The exploit's capability to bypass security boundaries also undermines trust in browser-based security controls, potentially increasing the attack surface for phishing and drive-by download attacks. The lack of current active exploitation provides a window for proactive defense, but also means organizations must act swiftly to mitigate risks before attackers develop or deploy more sophisticated payloads.
Mitigation Recommendations
Organizations should immediately inventory their Microsoft Edge deployments to identify affected versions, specifically version 134.0.6998.177. Until official patches are released, consider deploying temporary mitigations such as disabling or restricting the use of Edge's renderer processes where feasible, or using alternative browsers with robust sandboxing. Employ application control policies to prevent execution of unauthorized Perl scripts or suspicious binaries that could leverage the exploit. Enhance endpoint detection and response (EDR) capabilities to monitor for anomalous behavior indicative of sandbox escape attempts, such as unusual IPC activity or privilege escalation patterns. Network segmentation and least privilege principles should be enforced to limit the impact of potential compromises. Regularly update threat intelligence feeds and monitor Exploit-DB and vendor advisories for patch releases or additional indicators of compromise. Conduct user awareness training focused on recognizing phishing or social engineering attempts that could deliver the exploit payload. Finally, prepare incident response plans tailored to browser-based sandbox escapes to enable rapid containment and remediation.
Affected Countries
Germany, France, United Kingdom, Netherlands, Italy, Spain, Poland, Sweden
Indicators of Compromise
- exploit-code: # Titles: Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape # Author: nu11secur1ty # Date: 08/07/2025 # Vendor: Microsoft # Software: https://www.microsoft.com/en-us/software-download/windows11 # Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49730 # CVE-2025-2783 ## Description This project contains a **proof-of-concept (PoC)** simulation for **CVE-2025-2783**, a sandbox escape and privilege escalation vulnerability affecting the Microsoft Mojo IPC subsystem on Windows 11 Pro. The simulation demonstrates how a malicious renderer process could exploit a crafted IPC message to escape sandbox restrictions and escalate privileges, potentially leading to full system compromise. --- ## Disclaimer **This code is provided for educational and responsible disclosure purposes only.** Do NOT use it for unauthorized testing or attacks on systems you do not own or have explicit permission to test. The author(s) created this simulation in a controlled environment (virtual machine) to safely demonstrate the vulnerability before reporting it to Microsoft Security Response Center (MSRC). --- ## Components - `kur.py`: The main PoC Python script. It can run as either: - A phishing server hosting a malicious payload file - An exploit client that downloads the payload, simulates IPC communication, and triggers the sandbox escape. - `malicious_input.mojopipe`: The generated malicious payload JSON file (created at runtime). - `incident.log`: Log file recording actions and simulated system information captured during exploitation. --- ## Usage ### Prerequisites - Python 3.7 or later on Windows 11 Pro (preferably in a VM for safety). - Administrator privileges recommended for full information output. ### Steps 1. **Start the phishing server** (in one terminal): ```bash python kur.py ``` Enter choice: `1` This hosts the malicious payload file on `http://<your_ip>:8080/`. 2. **Run the exploit client** (in another terminal on the same machine): ```bash python kur.py ``` Enter choice: `2` This downloads the payload, simulates the IPC communication, and attempts sandbox escape. 3. **Observe logs** in `incident.log` and console output for evidence of the simulated exploit. --- ## Technical Details - The PoC simulates Mojo IPC message passing using Python's `multiprocessing.connection` module. - The exploit payload contains a special handle value that triggers the sandbox escape simulation. - When triggered, the PoC logs user and system info to demonstrate privilege escalation. - The phishing server serves the malicious payload to mimic real-world attack vector. --- ## Responsible Disclosure This simulation was developed to responsibly disclose the vulnerability to Microsoft Security Response Center (MSRC). Please coordinate with MSRC before any public release or use. # Video-demo: [href](https://www.youtube.com/watch?v=MvwtRybi6ac) # Buy me a coffee if you are not ashamed: [href](https://www.paypal.com/donate/?hosted_button_id=ZPQZT5XMC5RFY) # Time spent: 03:35:00 -- System Administrator - Infrastructure Engineer Penetration Testing Engineer Exploit developer at https://packetstormsecurity.com/ https://cve.mitre.org/index.html https://cxsecurity.com/ and https://www.exploit-db.com/ 0day Exploit DataBase https://0day.today/ home page: https://www.nu11secur1ty.com/ hiPEnIMR0v7QCo/+SEH9gBclAAYWGnPoBIQ75sCj60E= nu11secur1ty <http://nu11secur1ty.com/> -- System Administrator - Infrastructure Engineer Penetration Testing Engineer Exploit developer at https://packetstorm.news/ https://cve.mitre.org/index.html https://cxsecurity.com/ and https://www.exploit-db.com/ 0day Exploit DataBase https://0day.today/ home page: https://www.nu11secur1ty.com/ hiPEnIMR0v7QCo/+SEH9gBclAAYWGnPoBIQ75sCj60E= nu11secur1ty <http://nu11secur1ty.com/>
Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape
Description
Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape
AI-Powered Analysis
Technical Analysis
The identified security threat is a sandbox escape vulnerability in the Microsoft Edge Renderer Process, specifically involving the Mojo IPC component in version 134.0.6998.177. The sandbox is a critical security mechanism that isolates the browser's rendering engine from the underlying operating system to prevent malicious web content from executing arbitrary code or accessing sensitive system resources. This vulnerability enables an attacker to bypass these sandbox restrictions, effectively escaping the confined environment. The exploit leverages flaws in the inter-process communication (IPC) mechanism used by Edge's renderer processes, allowing malicious code to execute with higher privileges on the host machine. The presence of publicly available exploit code written in Perl indicates that the vulnerability could be weaponized by attackers with moderate technical skills. Although there are no known exploits in the wild currently, the availability of exploit code increases the risk of future attacks. The lack of official patches or updates at the time of reporting means systems remain vulnerable. This vulnerability can lead to unauthorized code execution, potentially allowing attackers to install malware, steal data, or disrupt system operations. The exploit does not require user interaction, increasing its threat level. The absence of a CVSS score necessitates an independent severity assessment, which considers the impact on confidentiality, integrity, and availability, as well as ease of exploitation and scope of affected systems.
Potential Impact
For European organizations, this vulnerability poses significant risks including unauthorized access to sensitive information, potential deployment of persistent malware, and disruption of business-critical applications. Organizations relying heavily on Microsoft Edge for web access, especially those in sectors like finance, government, and critical infrastructure, could face targeted attacks aiming to exploit this sandbox escape. The ability to execute code outside the sandbox can lead to full system compromise, data breaches, and lateral movement within corporate networks. Given the widespread adoption of Microsoft Edge across Europe, the vulnerability could affect a broad range of enterprises and public sector entities. The exploit's capability to bypass security boundaries also undermines trust in browser-based security controls, potentially increasing the attack surface for phishing and drive-by download attacks. The lack of current active exploitation provides a window for proactive defense, but also means organizations must act swiftly to mitigate risks before attackers develop or deploy more sophisticated payloads.
Mitigation Recommendations
Organizations should immediately inventory their Microsoft Edge deployments to identify affected versions, specifically version 134.0.6998.177. Until official patches are released, consider deploying temporary mitigations such as disabling or restricting the use of Edge's renderer processes where feasible, or using alternative browsers with robust sandboxing. Employ application control policies to prevent execution of unauthorized Perl scripts or suspicious binaries that could leverage the exploit. Enhance endpoint detection and response (EDR) capabilities to monitor for anomalous behavior indicative of sandbox escape attempts, such as unusual IPC activity or privilege escalation patterns. Network segmentation and least privilege principles should be enforced to limit the impact of potential compromises. Regularly update threat intelligence feeds and monitor Exploit-DB and vendor advisories for patch releases or additional indicators of compromise. Conduct user awareness training focused on recognizing phishing or social engineering attempts that could deliver the exploit payload. Finally, prepare incident response plans tailored to browser-based sandbox escapes to enable rapid containment and remediation.
Affected Countries
For access to advanced analysis and higher rate limits, contact root@offseq.com
Technical Details
- Edb Id
- 52403
- Has Exploit Code
- true
- Code Language
- perl
Indicators of Compromise
Exploit Source Code
Exploit code for Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape
# Titles: Microsoft Edge Renderer Process (Mojo IPC) 134.0.6998.177 - Sandbox Escape # Author: nu11secur1ty # Date: 08/07/2025 # Vendor: Microsoft # Software: https://www.microsoft.com/en-us/software-download/windows11 # Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49730 # CVE-2025-2783 ## Description This project contains a **proof-of-concept (PoC)** simulation for **CVE-2025-2783**, a sandbox escape and privilege escalation vulnerability affecting the Microsoft M... (3447 more characters)
Threat ID: 689a95b8ad5a09ad002b0985
Added to database: 8/12/2025, 1:15:36 AM
Last enriched: 11/3/2025, 9:40:03 AM
Last updated: 11/18/2025, 9:05:33 AM
Views: 145
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Related Threats
Chrome 142 Update Patches Exploited Zero-Day
MediumCritical Fortinet FortiWeb WAF Bug Exploited in the Wild
CriticalWidespread Exploitation of XWiki Vulnerability Observed
MediumLogitech Confirms Data Breach Following Designation as Oracle Hack Victim
LowRondoDox Exploits Unpatched XWiki Servers to Pull More Devices Into Its Botnet
HighActions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need enhanced features?
Contact root@offseq.com for Pro access with improved analysis and higher rate limits.