## DigitalOcean E2E Script Exposes SSH Command Injection Risk via Unsafe Variable Expansion
A critical security flaw has been identified in a DigitalOcean integration script, where unsafe variable interpolation creates a potential command injection vector in remote SSH commands. The vulnerability, located in the `_digitalocean_exec_long` function within the `sh/e2e/lib/clouds/digitalocean.sh` file, allows a base64-encoded command to be directly interpolated into a shell string without proper quoting. This design flaw could enable an attacker to break out of the intended command execution context if the encoded payload contains a single quote character.

The specific code at line 189 constructs a remote SSH command by embedding the `${encoded_cmd}` variable inside nested quotes: `ssh ... "root@${ip}" "timeout ${timeout_secs} bash -c \"\$(printf '%s' '${encoded_cmd}' | base64 -d)\""`. While the current attack surface is limited because the `encoded_cmd` variable is base64-encoded—a character set that excludes single quotes—the security of the entire operation hinges on the correctness of the base64 implementation and the assumption that the command variable remains uncorrupted. This creates a brittle dependency on external factors for security.

The recommended fix is to eliminate the risky string interpolation entirely by passing the base64-encoded command via stdin to the remote shell. This architectural change would sever the direct link between variable content and the command string, fundamentally closing the injection vector. The persistence of this pattern in a cloud provider's testing infrastructure highlights a systemic reliance on implicit security through data encoding rather than explicit, robust process isolation, raising broader questions about secure coding practices in DevOps toolchains.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cybersecurity, vulnerability, SSH, command injection, DevOps
- **Credibility**: unverified
- **Published**: 2026-03-28 06:27:00
- **ID**: 38804
- **URL**: https://whisperx.ai/en/intel/38804