Remote Code Execution Vulnerability Found in AWS WorkSpaces

guest · Sep 22, 2021

Remote Code Execution Vulnerability Found in AWS WorkSpaces
September 22, 2021
https://www.securityweek.com/remote-code-execution-vulnerability-found-aws-workspaces

Tracked as CVE-2021-38112, the security bug could be triggered when the user opens a malicious WorkSpaces URI from the browser, allowing a remote attacker to execute arbitrary code on the vulnerable system.

A fully managed desktop virtualization service, AWS WorkSpaces provides users with fast access to remote resources. Deployed within an Amazon Virtual Private Cloud (VPC), WorkSpaces can be deployed as a desktop client, on both Windows and Linux machines.
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What researchers with Rhino Security discovered was that, when launched using the URI, the WorkSpaces application did not properly sanitize parameters passed to the command line for authentication to the Amazon service, which could allow for the execution of arbitrary commands.

“Since the WorkSpaces client is based on the Chromium Embedded Framework (CEF) this allows arguments to be injected into the command line which abuse a known debugging CEF command line argument (–gpu-launcher), allowing arbitrary commands to be executed,” the researchers explain.
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Rhino Security: CVE-2021-38112: AWS WorkSpaces Remote Code Execution

This post details a vulnerability Rhino Security Labs discovered in the AWS WorkSpaces desktop client, tracked as CVE-2021-38112, which allows commands to be executed if a victim opens a malicious WorkSpaces URI from their browser. Rhino reported the vulnerability to Amazon and it was promptly patched. AWS WorkSpaces desktop client versions prior to 3.1.9 are affected by the vulnerability.

This AWS WorkSpaces vulnerability allows remote code execution on the operating system of the installed WorkSpace client. This vulnerability could also allow an attacker to potentially pivot into an AWS WorkSpaces host by configuring proxy settings in the WorkSpaces client itself or keylogging usernames and passwords when a victim legitimately accesses their WorkSpaces environment.
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Remote Code Execution Vulnerability Found in AWS WorkSpaces

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