CVE-2021-44078: Sandbox Escape in Unicorn Engine
Summary
CVE-2021-44078: An issue was discovered in split_region in uc.c in Unicorn Engine before 2.0.0-rc5. Affects unicorn across 2 version ranges.
< 2.0.0rc1
< c733bbada356b0373fa8aa72c044574bb855fd24
Fixed in c733bbada356b0373fa8aa72c044574bb855fd24. How to fix ↓
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Background
Unicorn Engine is an open-source library that provides a lightweight, multi-platform CPU emulator framework. It is commonly used for binary analysis, reverse engineering, and vulnerability research. The engine allows users to emulate the execution of code in various architectures, including x86, ARM, MIPS, and more. Unfortunately, a vulnerability has been discovered in Unicorn Engine that allows local attackers to escape the sandbox and execute arbitrary code on the host machine.
Vulnerability Detail
The specific vulnerability exists within the virtual memory manager of Unicorn Engine. The issue arises from a faulty comparison of the Guest Virtual Address (GVA) and Guest Physical Address (GPA) during the execution of the split_region function in uc.c. This flaw can be exploited by an attacker who already has the ability to execute crafted code within the target sandbox. By leveraging this vulnerability, an attacker can escape the sandbox and gain unauthorized access to the host machine. The ramifications of this vulnerability include potential data breaches, privilege escalation, and the execution of malicious code.
How To Fix
Minimum fixed version
c733bbada356b0373fa8aa72c044574bb855fd24
This is the first release that contains the fix.
pip install --upgrade "unicorn==c733bbada356b0373fa8aa72c044574bb855fd24"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a workaround, users can consider implementing additional security measures to limit the impact of this vulnerability. This may include restricting access to the affected sandbox, implementing strict code execution policies, and monitoring for any suspicious activities or attempts to escape the sandbox. However, applying the official fix by updating to the latest version is strongly recommended to fully address the vulnerability.
Conclusion
The vulnerability in Unicorn Engine allows local attackers to escape the sandbox and execute arbitrary code on the host machine. To mitigate this risk, it is crucial to update the Unicorn Engine library and all related dependencies to the latest patched version. Implementing additional security measures and monitoring for suspicious activities can provide temporary mitigation, but the official fix should be applied as soon as possible. For further support on vulnerability remediation, contact DevNack.com.
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FAQ
Unicorn Engine is an open-source CPU emulator framework used for binary analysis, reverse engineering, and vulnerability research.
The vulnerability allows local attackers to escape the sandbox and execute arbitrary code on the host machine, potentially leading to data breaches, privilege escalation, and the execution of malicious code.
To fix this vulnerability, update the Unicorn Engine library to version 2.0.0-rc5 or later. Ensure that all dependencies and applications using Unicorn Engine are also updated.
While implementing additional security measures can help limit the impact of the vulnerability, it is strongly recommended to apply the official fix by updating to the latest version.
For more information, refer to the official advisory database entry at https://github.com/pypa/advisory-database/blob/main/vulns/unicorn/PYSEC-2021-868.yaml
References
Related vulnerabilities
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