File Write Vulnerability in Go Playground Host

Executive Summary

This vulnerability involves a malicious txtar file escaping its intended execution context to write to the playground host's trusted filesystem. Additionally, a misconfigured path for invoking go vet allowed a Go process to read an environment configuration file from the playground host's $HOME directory. Combined, these flaws could enable remote code execution on the playground host.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability involves malicious txtar files or improper go env file handling in Go playground deployments. To detect it, inspect Go playground logs for unauthorized filesystem writes or go vet invocations with unusual paths. Check for files created outside intended directories, especially in $HOME or trusted filesystem areas.

Useful 0 Not Useful 0

Impact Analysis

If you run independent deployments of golang.org/x/playground, attackers could exploit this to execute arbitrary code on your system. Users of go.dev/play are not affected. The impact includes potential data breaches, system compromise, or unauthorized access to sensitive files.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's integrity and confidentiality principles or HIPAA's safeguards for protected health information. Compliance may be impacted if exploited, requiring incident response and potential regulatory reporting.

Useful 0 Not Useful 0

Mitigation Strategies

Update or patch the golang.org/x/playground package to the latest version to address the arbitrary write and environment file read issues. Disable or restrict access to independent deployments of golang.org/x/playground if not necessary. Monitor for suspicious filesystem writes or unexpected Go process behavior.

Useful 0 Not Useful 0