CVE-2016-7032

What it actually does

sudo_noexec.so allows local processes invoking system() or popen() to execute commands despite noexec restrictions enforced by sudo.

Why it matters to the business

Local users on affected Linux systems can circumvent command execution controls, enabling unauthorized actions that may lead to privilege escalation or data exposure on widely deployed sudo installations.

How an attack unfolds

A local attacker compiles or deploys an application that calls system() or popen() to invoke a restricted binary, bypassing the noexec wrapper enforced by sudo before version 1.8.15.

How to fix it

Upgrade sudo to version 1.8.15 or later on all Linux systems; where immediate upgrade is not possible, review and tighten sudoers rules that rely on noexec.

How to confirm the fix worked

Run 'sudo -V' to confirm version 1.8.15 or newer; test affected sudoers entries with a wrapper application calling system() or popen() to verify the restriction is enforced.

Typical attack path

1. Obtain local shell access on a Linux host running vulnerable sudo
2. Identify a sudoers rule that applies noexec to a command
3. Create or obtain an application using system() or popen() to invoke the restricted command
4. Execute the application under the sudo policy to bypass the restriction

How to detect it

Review sudo logs and process execution records for invocations of system() or popen() wrappers around commands that should have been blocked by noexec; correlate with unexpected child processes spawned from sudo sessions.

What your security team should do

• Prioritize upgrade of sudo packages to 1.8.15+ across the environment
• Audit sudoers configurations that depend on noexec and remove unnecessary entries
• Monitor for local privilege-escalation attempts involving sudo wrappers