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 reported security threat involves a sandbox escape vulnerability in the Microsoft Edge browser's Renderer Process, specifically related to the Mojo IPC (Inter-Process Communication) mechanism in version 134.0.6998.177. The renderer process in modern browsers like Edge is designed to isolate web content execution from the underlying operating system to prevent malicious web pages from affecting the host system. Mojo IPC is a communication framework used internally by Chromium-based browsers, including Edge, to facilitate secure and efficient message passing between different processes. A sandbox escape vulnerability in this context implies that an attacker could exploit flaws in the Mojo IPC implementation to break out of the restricted renderer sandbox environment. This would allow the attacker to execute arbitrary code with higher privileges on the host system, potentially leading to full system compromise. The exploit code is publicly available and written in Perl, indicating that proof-of-concept or weaponized code exists, which could be leveraged by attackers to automate exploitation. Although the affected versions are not explicitly listed, the specific version 134.0.6998.177 is mentioned, suggesting that this particular build of Microsoft Edge is vulnerable. No official patches or mitigations are referenced, and there are no known exploits in the wild at the time of reporting. The medium severity rating reflects the significant risk posed by sandbox escapes, balanced against the complexity of exploitation and the requirement for the attacker to deliver malicious content to the victim's browser. However, the presence of exploit code increases the likelihood of exploitation attempts.
Potential Impact
For European organizations, this vulnerability poses a substantial risk, especially for those relying heavily on Microsoft Edge for web browsing in corporate environments. Successful exploitation could allow attackers to bypass browser sandbox protections, leading to arbitrary code execution on endpoint devices. This could result in data theft, installation of persistent malware, lateral movement within networks, and disruption of business operations. Given the widespread use of Edge in enterprises and public sector organizations across Europe, the impact could be significant, particularly in sectors handling sensitive data such as finance, healthcare, and government. Additionally, the ability to escape the sandbox could facilitate more sophisticated attacks, including supply chain compromises or espionage campaigns. The absence of known exploits in the wild currently provides a limited window for proactive defense, but the availability of exploit code increases the urgency for mitigation.
Mitigation Recommendations
European organizations should prioritize updating Microsoft Edge to the latest available version as soon as a patch addressing this vulnerability is released. In the interim, organizations can implement several practical mitigations: 1) Enforce strict application control policies to limit execution of unauthorized scripts and binaries, including Perl scripts that could be used to exploit this vulnerability. 2) Utilize endpoint detection and response (EDR) solutions to monitor for unusual process behaviors indicative of sandbox escape attempts. 3) Restrict user privileges to minimize the impact of potential code execution beyond the browser sandbox. 4) Employ network-level protections such as web filtering and intrusion prevention systems to block access to known malicious sites that could host exploit payloads. 5) Educate users on the risks of interacting with untrusted web content and phishing attempts that could trigger exploitation. 6) Consider deploying browser isolation technologies that further compartmentalize web content execution. These measures, combined with timely patching, will reduce the risk posed by this vulnerability.
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 reported security threat involves a sandbox escape vulnerability in the Microsoft Edge browser's Renderer Process, specifically related to the Mojo IPC (Inter-Process Communication) mechanism in version 134.0.6998.177. The renderer process in modern browsers like Edge is designed to isolate web content execution from the underlying operating system to prevent malicious web pages from affecting the host system. Mojo IPC is a communication framework used internally by Chromium-based browsers, including Edge, to facilitate secure and efficient message passing between different processes. A sandbox escape vulnerability in this context implies that an attacker could exploit flaws in the Mojo IPC implementation to break out of the restricted renderer sandbox environment. This would allow the attacker to execute arbitrary code with higher privileges on the host system, potentially leading to full system compromise. The exploit code is publicly available and written in Perl, indicating that proof-of-concept or weaponized code exists, which could be leveraged by attackers to automate exploitation. Although the affected versions are not explicitly listed, the specific version 134.0.6998.177 is mentioned, suggesting that this particular build of Microsoft Edge is vulnerable. No official patches or mitigations are referenced, and there are no known exploits in the wild at the time of reporting. The medium severity rating reflects the significant risk posed by sandbox escapes, balanced against the complexity of exploitation and the requirement for the attacker to deliver malicious content to the victim's browser. However, the presence of exploit code increases the likelihood of exploitation attempts.
Potential Impact
For European organizations, this vulnerability poses a substantial risk, especially for those relying heavily on Microsoft Edge for web browsing in corporate environments. Successful exploitation could allow attackers to bypass browser sandbox protections, leading to arbitrary code execution on endpoint devices. This could result in data theft, installation of persistent malware, lateral movement within networks, and disruption of business operations. Given the widespread use of Edge in enterprises and public sector organizations across Europe, the impact could be significant, particularly in sectors handling sensitive data such as finance, healthcare, and government. Additionally, the ability to escape the sandbox could facilitate more sophisticated attacks, including supply chain compromises or espionage campaigns. The absence of known exploits in the wild currently provides a limited window for proactive defense, but the availability of exploit code increases the urgency for mitigation.
Mitigation Recommendations
European organizations should prioritize updating Microsoft Edge to the latest available version as soon as a patch addressing this vulnerability is released. In the interim, organizations can implement several practical mitigations: 1) Enforce strict application control policies to limit execution of unauthorized scripts and binaries, including Perl scripts that could be used to exploit this vulnerability. 2) Utilize endpoint detection and response (EDR) solutions to monitor for unusual process behaviors indicative of sandbox escape attempts. 3) Restrict user privileges to minimize the impact of potential code execution beyond the browser sandbox. 4) Employ network-level protections such as web filtering and intrusion prevention systems to block access to known malicious sites that could host exploit payloads. 5) Educate users on the risks of interacting with untrusted web content and phishing attempts that could trigger exploitation. 6) Consider deploying browser isolation technologies that further compartmentalize web content execution. These measures, combined with timely patching, will reduce the risk posed by this vulnerability.
Affected Countries
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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: 8/12/2025, 1:17:36 AM
Last updated: 8/12/2025, 9:49:43 AM
Views: 4
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