linuxexpert-practice-labs/labs/linux-plus/3-6-1-vulnerabilities-and-standards

Linux+ 3.6.1: Vulnerabilities, detection and standards

Scanning your own machine, finding CVEs in a package's changelog, and a CIS benchmark scan.

Before you start

The peer, at 10.99.0.2 (name peer), stands in for the Ubuntu VM: scan this VM, 10.99.0.1, from there. Get a shell there with sudo ip netns exec lepeer bash; it shares this VM's programs, so install nmap on this VM. Write answers to the files in /root/lab-answers/.

Tasks

1. From the peer, scan this VM with nmap -sV 10.99.0.1 and nmap -sU --top-ports 20 10.99.0.1, and compare with ss -tulpn here. Write the product and version nmap reports for port 22 to /root/lab-answers/1.
2. Find a CVE fixed in the openssh-server package, from its changelog, and write its ID (such as CVE-2024-6387) to /root/lab-answers/2. On the RHEL family, also list the security advisories.
3. RHEL family: install the SCAP scanner and content, find a CIS profile in the data stream for this system, and run a scan with it, writing the HTML report to /root/cis.html. It takes a few minutes.

Hints

• dnf install nmap or apt install nmap; the VERSION column.
• rpm -q --changelog openssh-server, dnf updateinfo list --security; apt changelog openssh-server, or /usr/share/doc/openssh-server/changelog.Debian.gz (zgrep).
• dnf install openscap-scanner scap-security-guide, /usr/share/xml/scap/ssg/content/, oscap info, oscap xccdf eval --profile ID --report FILE DATASTREAM.