Shellshock or Bashdoor is a vulnerability that occurs in most versions of Linux and Unix operating systems. It was discovered on September 12, 2014, and affects all distributions of Linux using Bash shell. Shellshock vulnerability makes it possible to execute commands remotely using environment variables.
Understanding the Bash vulnerability – Shellshock
by Tajinder Kalsi
Practical Linux Security Cookbook - Second Edition
- Title Page
- Copyright and Credits
- Contributors
- Packt Upsell
- Preface
- Linux Security Problem
- Security policy
- Configuring server security
- Security policy – server security
- Defining security controls
- Checking the integrity of installation medium by using checksum
- Using LUKS disk encryption
- Make use of sudoers – configuring sudo access
- Scanning hosts with Nmap
- Gaining root on a vulnerable Linux system
- Missing backup plans
- Configuring a Secure and Optimized Kernel
- Local Filesystem Security
- Viewing files and directory details using ls
- Using chmod to set permissions on files and directories
- Using chown to change ownership of files and directories
- Using ACLs to access files
- File handling using the mv command (moving and renaming)
- Implementing Mandatory Access Control with SELinux
- Using extended file attributes to protect sensitive files
- Installing and configuring a basic LDAP server on Ubuntu
- Local Authentication in Linux
- Remote Authentication
- Network Security
- Security Tools
- Linux Security Distros
- Bash Vulnerability Patching
- Security Monitoring and Logging
- Viewing and managing log files using Logcheck
- Monitoring the network using Nmap
- Using Glances for system monitoring
- Monitoring logs using MultiTail
- Using system tools – whowatch
- Using system tools – stat
- Using System tools – lsof
- Using System tools – strace
- Real time IP LAN monitoring using IPTraf
- Network security monitoring using Suricata
- Network monitoring using OpenNMS
- Understanding Linux Service Security
- Scanning and Auditing Linux
- Vulnerability Scanning and Intrusion Detection
- Other Books You May Enjoy
Understanding the Bash vulnerability – Shellshock
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