Security vulnerabilities and automated fixes for distributed systems issues
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A critical vulnerability in `redis-lock/server.mjs` allowed any authenticated client to release another client's lock by guessing predictable holder identifiers like process IDs or hostnames. The fix implements cryptographically random `lockId` values that are minted on lock acquisition and validated on release, eliminating the exploit primitive entirely.
A high-severity shell injection vulnerability was discovered and patched in a distributed server's gRPCurl command generation logic, where user-controlled values from API responses were directly interpolated into shell command strings without proper escaping. An attacker who can influence API response data — such as headers, endpoints, or payloads — could inject shell metacharacters that execute arbitrary commands when a user pastes and runs the generated command. This fix eliminates the risk by