8.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-21882

CVE-2026-21882: theshit's Improper Privilege Dropping Allows Local Privilege Escalation via Command Re-execution

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.

(GitHub Advisory)

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CVE-2026-21882

CVE-2026-21882:

8.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
theshit	rust	< 0.2.0	0.2.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a local privilege escalation in the theshit command-line tool. It occurs when the tool is run with elevated privileges (e.g., using sudo). The application's fix command re-executes a previous command, but it fails to drop the elevated privileges before doing so. This allows a local user to execute arbitrary commands as root.

The analysis of the patch commit 5293957b119e55212dce2c6dcbaf1d7eb794602a reveals the root cause. The function theshit::fix::get_command_output in src/fix.rs was responsible for executing the command. This function directly used std::process::Command without any privilege management, causing the command to inherit the elevated privileges of the main process. The function theshit::fix::fix_command is the public function that calls this vulnerable get_command_output function.

The patch addresses this by removing the vulnerable get_command_output function and introducing a new module src/fix/output.rs. The new get_command_output function in this module now includes logic to detect if the application is running with elevated privileges (e.g., sudo, doas, or SUID bit). If so, it uses libc::setuid and libc::setgid within a pre_exec hook to drop privileges to the original user before executing the command, thus mitigating the vulnerability.

Vulnerable functions

theshit::fix::get_command_output

src/fix.rs

This function was responsible for executing the command provided by the user. It used `std::process::Command` to spawn a new process. However, it did not perform any checks or attempt to drop privileges if the application was running with elevated permissions (e.g., via `sudo`). As a result, if an attacker could control the command being executed, they could execute arbitrary commands with the same elevated privileges as the application, leading to local privilege escalation. The patch completely removed this function and replaced its logic with a new implementation that properly handles privilege dropping.

theshit::fix::fix_command

src/fix.rs

This function is the entry point for the `fix` command functionality. It calls the vulnerable `get_command_output` function to execute a command. An attacker would invoke the `fix` command of the application to trigger the vulnerable execution flow within `get_command_output`. The patch changes this function to call the new, secure version of `get_command_output` located in the `output` module.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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