CVE-2023-29199
CVE-2023-29199
Weakness (CWE)
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- Low
- Privileges Required
- None
- User Interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Description
There exists a vulnerability in source code transformer (exception sanitization logic) of vm2 for versions up to 3.9.15, allowing attackers to bypass `handleException()` and leak unsanitized host exceptions which can be used to escape the sandbox and run arbitrary code in host context. A threat actor can bypass the sandbox protections to gain remote code execution rights on the host running the sandbox. This vulnerability was patched in the release of version `3.9.16` of `vm2`.
Comprehensive Technical Analysis of CVE-2023-29199
1. Vulnerability Assessment and Severity Evaluation
CVE ID: CVE-2023-29199
Description: The vulnerability exists in the source code transformer (exception sanitization logic) of vm2 for versions up to 3.9.15. This flaw allows attackers to bypass the handleException() method, leading to the leakage of unsanitized host exceptions. This can be exploited to escape the sandbox and execute arbitrary code in the host context.
CVSS Score: 9.8
Severity Evaluation:
- Critical: The CVSS score of 9.8 indicates a critical vulnerability. The high score is due to the potential for remote code execution (RCE) and the ability to escape the sandbox, which can lead to full system compromise.
- Impact: The vulnerability can result in unauthorized access, data breaches, and system takeover.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Code Execution (RCE): An attacker can craft malicious input that bypasses the exception sanitization logic, allowing them to execute arbitrary code on the host system.
- Sandbox Escape: By exploiting the vulnerability, an attacker can escape the sandbox environment, gaining access to the host system's resources and potentially executing malicious code with elevated privileges.
Exploitation Methods:
- Crafted Input: An attacker can send specially crafted input to the
vm2sandbox that triggers the vulnerability. - Exception Handling Bypass: The attacker can manipulate the exception handling mechanism to leak unsanitized exceptions, which can then be used to execute arbitrary code.
3. Affected Systems and Software Versions
Affected Software:
vm2versions up to 3.9.15
Affected Systems:
- Any system running the vulnerable versions of
vm2. This includes servers, applications, and services that rely onvm2for sandboxing JavaScript code execution.
4. Recommended Mitigation Strategies
Immediate Actions:
- Upgrade: Upgrade to
vm2version 3.9.16 or later, which includes the patch for this vulnerability. - Temporary Workarounds: If immediate upgrading is not possible, consider disabling or limiting the use of
vm2until the patch can be applied.
Long-Term Strategies:
- Regular Updates: Ensure that all software dependencies are regularly updated to the latest versions.
- Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
- Monitoring: Implement monitoring and alerting for unusual activities that may indicate an exploitation attempt.
5. Impact on Cybersecurity Landscape
Broader Implications:
- Supply Chain Security: This vulnerability highlights the importance of securing third-party libraries and dependencies. Organizations must ensure that all components in their software supply chain are up-to-date and secure.
- Sandboxing Techniques: The vulnerability underscores the need for robust sandboxing techniques and thorough testing of exception handling mechanisms.
- Incident Response: Organizations should have incident response plans in place to quickly address and mitigate such critical vulnerabilities.
6. Technical Details for Security Professionals
Vulnerability Details:
- Root Cause: The vulnerability stems from a flaw in the exception sanitization logic within the
handleException()method ofvm2. - Exploitation: An attacker can manipulate the input to bypass the sanitization process, leading to the leakage of unsanitized exceptions. These exceptions can then be used to escape the sandbox and execute arbitrary code.
Patch Information:
- Patch Version: The vulnerability was patched in
vm2version 3.9.16. - Patch Details: The patch addresses the flaw in the exception sanitization logic, ensuring that all exceptions are properly sanitized and preventing the leakage of unsanitized exceptions.
References:
Conclusion:
CVE-2023-29199 is a critical vulnerability that underscores the importance of robust exception handling and sandboxing techniques. Organizations should prioritize upgrading to the patched version of vm2 and implement comprehensive security measures to mitigate similar risks in the future.