CVE-2021-44078 : Security Advisory and Response

An issue was discovered in split_region in uc.c in Unicorn Engine before 2.0.0-rc5. It allows local attackers to escape the sandbox. An attacker must first obtain the ability to execute crafted code in the target sandbox in order to exploit this vulnerability. The specific flaw exists within the virtual memory manager. The issue results from the faulty comparison of GVA and GPA while calling uc_mem_map_ptr to free part of a claimed memory block. An attacker can leverage this vulnerability to escape the sandbox and execute arbitrary code on the host machine.

Understanding CVE-2021-44078

What is CVE-2021-44078?

The vulnerability in split_region in uc.c in Unicorn Engine allows local attackers to escape the sandbox.

The Impact of CVE-2021-44078

The vulnerability can be exploited if the attacker executes crafted code in the target sandbox, leading to escaping the sandbox and executing arbitrary code on the host machine.

Technical Details of CVE-2021-44078

Vulnerability Description

The flaw arises in the faulty comparison of GVA and GPA during the release of a portion of a memory block.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: All versions before 2.0.0-rc5

Exploitation Mechanism

The vulnerability allows attackers to abuse the faulty comparison of GVA and GPA while calling uc_mem_map_ptr.

Mitigation and Prevention

Immediate Steps to Take

Update to version 2.0.0-rc5 of Unicorn Engine to address the vulnerability.
Avoid executing untrusted code or scripts to prevent exploitation.

Long-Term Security Practices

Regularly monitor for security updates and patches.
Implement sandboxing mechanisms to restrict access and capabilities.
Conduct security audits and code reviews regularly.

Patching and Updates

Ensure timely installation of security patches and updates to prevent exploitation.