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Bash Shell Scripting for Pentesters

Name: Bash Shell Scripting for Pentesters
Author: Steve Campbell
ISBN: 9781835880821

by Steve Campbell

December 2024

Intermediate to advanced

402 pages

9h 56m

English

Packt Publishing

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Bash Shell Scripting for Pentesters
Foreword
Contributors
About the author
About the reviewers
Preface
Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesConventions usedDisclaimerGet in touchShare Your ThoughtsDownload a free PDF copy of this book
Part 1: Getting Started with Bash Shell Scripting
Chapter 1: Bash Command-Line and Its Hacking Environment
Technical requirementsIntroduction to BashLab setupVirtual machinesDocker containersLive USBCloud-based systemsVulnerable lab targetsConfiguring your hacker shellCustomizing the Bash promptSetting up essential pentesting toolsUpdate the package managerInstall ProjectDiscovery toolsInstall NetExecSummary
Chapter 2: File and Directory Management
Technical requirementsWorking with files and directoriesDirectory navigation and manipulationFilesystem design and hierarchyFilesystem navigation commandsFile permissions and ownershipOwnership and groupsSpecial permissions – SUID and SGIDLinking files – hard links and symlinksSummary
Chapter 3: Variables, Conditionals, Loops, and Arrays
Technical requirementsIntroducing variablesDeclaring variablesAccessing variablesEnvironment variablesA review of variablesBranching with conditional statementsThe if statementAdding elseThe power of elifBeyond simple comparisonsCombining conditionsCase statementsRepeating with loopsThe for loopThe while loopThe until loopSelect – interactive menus made easyAdvanced usage – nested loopsUsing break and continueUsing arrays for data containersLooping through arraysSummary
Chapter 4: Regular Expressions
Technical requirementsThe basics of regexUsing character classesFlags – modifying your searchApplying basic regex examplesAdvanced regex patterns and techniquesPractical example – extracting data using regexUtilizing alternationsDemonstrating practical applicationsMatching IP addresses with grepUsing handy grep flagsRedacting IP addressesRegex tips and best practicesSummary

Chapter 5: Functions and Script Organization
Introduction to Bash functionsCode reuseModularityEncapsulationTestabilityPerformanceDefining and calling a functionPassing arguments to functionsHandling a variable number of argumentsDefault values for argumentsThe scope and lifetime of variables in functionsGlobal variablesLocal variablesVariable lifetimeModifying global variables inside functionsAdvanced function techniquesFunction return valuesRecursive functionsImporting functionsFunctions versus aliasesSummary
Chapter 6: Bash Networking
Technical requirementsNetworking basics with BashUnderstanding IP addresses and subnets (IPv4)Understanding IP addresses and subnets (IPv6)Configuring network interfaces using Bash commandsTroubleshooting network connectivity with Bash toolsScripting network enumerationNetwork exploitationNetwork service exploitationNetwork traffic analysisCapturing and analyzing network trafficInterpreting packet capturesSummary
Chapter 7: Parallel Processing
Understanding parallel processing in BashImplementing basic parallel executionAdvanced parallel processing with xargs and GNU parallelIntroducing xargs for robust parallel processingUsing GNU parallel for enhanced controlComparing xargs and parallelAchieving parallelism using screenPractical applications and best practicesPractical applications of Bash parallel processingBest practices for parallel execution in BashSummary
Part 2: Bash Scripting for Pentesting
Chapter 8: Reconnaissance and Information Gathering
Technical requirementsIntroducing reconnaissance with BashFormatting usernames and email addressesUsing Bash for DNS enumerationExpanding the scope using BashAutomating subdomain enumeration with BashUsing Bash to identify web applicationsUsing Bash for certificate enumerationUsing Bash to format vulnerability scan targetsSummary
Chapter 9: Web Application Pentesting with Bash
Technical requirementsAutomating HTTP requests in BashAnalyzing web application security with BashProjectDiscoveryRunning command-line scans with ZAPLearning advanced data manipulation techniquesSummary
Chapter 10: Network and Infrastructure Pentesting with Bash
Technical requirementsFundamentals of network pentesting with BashCore methodologies in network pentestingSetting up the pentest environmentUsing tmux for persistent sessionsBasic network scanning with NmapFast network scanning with MasscanProcessing scan results with BashConclusionAdvanced network scanning techniques in BashEnumerating network services and protocols using BashInfrastructure vulnerability assessment with BashEnumerating network hosts with NetExecAutomating vulnerability scanning with GreenboneSummary
Chapter 11: Privilege Escalation in the Bash Shell
Technical requirementsUnderstanding privilege escalation in Unix/Linux systemsEnumeration techniques for privilege escalationInitial accessSystem information gatheringExploiting SUID and SGID binaries with BashLeveraging misconfigured services and scheduled tasksSummary
Chapter 12: Persistence and Pivoting
Technical requirementsThe fundamentals of persistence with BashCreating a new user in BashBackdooring the Bash shellCreating backdoor cron jobsBackdooring system files for persistenceBackdooring with SSH authorized keysLearning advanced persistence techniquesThe basics of network pivoting with BashMastering advanced pivoting and lateral movementDynamic chain pivotingDNS tunnelingCleanup and covering tracksSummary
Chapter 13: Pentest Reporting with Bash
Technical requirementsAutomating data collection for reporting with BashIdentifying key data pointsParsing and cleaning raw data using BashStoring and managing pentest data with SQLiteIntegrating Bash with reporting toolsSummary
Part 3: Advanced Applications of Bash Scripting for Pentesting
Chapter 14: Evasion and Obfuscation
Technical requirementsEnumerating the environment for AV and EDRBasic obfuscation techniques in BashAdvanced evasion tactics using BashAutomating evasion script generation in BashSummary
Chapter 15: Interfacing with Artificial Intelligence
Technical requirementsEthical and practical considerations of AI in pentestingThe basics of AI in pentestingBasic terminology and definitions of ML and AICreating a foundation for successful AI use in pentestingRedefining the system promptEnhancing vulnerability identification with AIAI-assisted decision-making in pentestingTesting the Pentest Hero AI agentSummary
Chapter 16: DevSecOps for Pentesters
Technical requirementsIntroduction to DevSecOps for pentestersUnderstanding the intersection of DevOps and securityCommon use cases for Bash in security automationConfiguring the CI/CD pipeline with BashInitial setup and error handlingLogging functionsError handler and initializationSystem checksDevelopment tools installationSecurity tools installationGitLab CI/CD setupWorkspace creationCrafting security-focused Bash scripts for DevSecOpsCreating the scan scriptCreating vulnerable artifactsIntegrating real-time security monitoring with BashAutomating custom Kali Linux builds for pentestingSummary
Index
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Content preview from Bash Shell Scripting for Pentesters

6 Bash Networking

In Chapter 5, you learned how to use functions to make your code more robust. This chapter will build on previous chapters by applying what you’ve learned to real-world pentesting tasks related to networking and network exploitation.

This chapter dives into the world of Bash networking. We’ll take a tour of commands and scripts that let you configure, troubleshoot, and exploit networking in a Unix/Linux environment. You’ll learn not just how to access network configuration details and interact with network components but also how to use Bash scripting to exploit vulnerable network services. We’ll start with the basics, then gradually step into more advanced concepts, all the way to network traffic analysis.

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Bash Shell Scripting for Pentesters

by Steve Campbell

6

Bash Networking

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.