theshit is a command-line utility that automatically detects and fixes common mistakes in shell commands. Prior to version 0.2.0, improper privilege dropping allows local privilege escalation via command re-execution. This issue has been patched in version 0.2.0.

Affected: crates.io: theshit

### Impact

**Vulnerability Type:** Local Privilege Escalation (LPE) / Improper Privilege Management / Arbitrary Command Execution.

The application automatically re-executes the previously failed command but does not properly drop elevated privileges during this process.

When the tool is executed with `sudo` or otherwise runs with an effective UID of root, it records the last executed command and attempts to rerun it. However, the application fails to restore the original unprivileged user context before re-executing the command. As a result, the retried command is executed with root privileges, even if the original command was issued by an unprivileged user.

This allows a local attacker to intentionally trigger a failed command under elevated execution and gain arbitrary command execution as root via the retry mechanism.

**Who is impacted:** Any system where this tool is executed with elevated privileges is affected. The risk is especially high in environments where the tool is permitted to run via `sudo`, including configurations with `NOPASSWD`, as an unprivileged user can escalate privileges to root without additional interaction.

### Proof of Concept

To verify the vulnerability without a shell, attempt to create a file in a root-protected directory.

**1. Verify the file does not exist** ```bash sudo ls /root/proof_of_lpe # Output: No such file or directory ```

**2. Run the vulnerable command** ```bash sudo bash -c "SH_PREV_CMD='touch /root/proof_of_lpe' target/r…