CVE-2021-43638 : Security Advisory and Response
Learn about CVE-2021-43638, an Integer Overflow vulnerability in Amazon WorkSpaces agent. Find out its impact, affected versions, exploitation methods, and mitigation steps to secure your systems.
Amazon Amazon WorkSpaces agent is affected by an Integer Overflow vulnerability that allows local attackers to execute arbitrary code or cause denial of service.
Understanding CVE-2021-43638
What is CVE-2021-43638?
The Amazon WorkSpaces agent below v1.0.1.1537 is affected by an Integer Overflow, enabling local attackers to execute arbitrary code in kernel mode or trigger a denial of service using specially crafted I/O Request Packets.
The Impact of CVE-2021-43638
The vulnerability allows attackers to execute arbitrary code in kernel mode or disrupt system operation through memory corruption, potentially leading to an OS crash.
Technical Details of CVE-2021-43638
Vulnerability Description
The Integer Overflow in IOCTL Handler 0x22001B of the Amazon WorkSpaces agent permits exploitation by local attackers through specially crafted I/O Request Packets.
Affected Systems and Versions
- Amazon WorkSpaces agent versions below v1.0.1.1537
Exploitation Mechanism
- Attackers can exploit this vulnerability locally to execute arbitrary code in kernel mode or cause denial of service.
Mitigation and Prevention
Immediate Steps to Take
- Update Amazon WorkSpaces agent to version v1.0.1.1537 or higher.
- Monitor system activity for any signs of unauthorized code execution.
Long-Term Security Practices
- Implement the principle of least privilege to restrict access.
- Regularly update systems and software to mitigate potential vulnerabilities.
Patching and Updates
- Apply security patches and updates released by Amazon for the WorkSpaces agent to address the Integer Overflow vulnerability.