SSH Tunnelling to Punch Through Corporate Firewalls – Updated take on one of the oldest LOLBINs
This write-up discusses advanced SSH tunneling techniques for network penetration testing and red team engagements. It focuses on using the native OpenSSH client in Windows 10/11 to create reverse dynamic SOCKS proxies, allowing testers to access internal networks and run offensive tools remotely. The guide covers: 1. Using the -R flag for reverse dynamic proxies 2. Techniques to bypass corporate firewalls, including using Azure domains and ASN IP ranges 3. Methods for payload delivery and data exfiltration using SCP 4. OpSec-safe PowerShell script execution through SSH The write-up also includes recommendations for defenders, such as removing the SSH client from non-technical staff endpoints, securing corporate firewall settings, and monitoring for SSH binary execution.
FEATURES
SIMILAR TOOLS
A comprehensive Windows command-line reference guide for security professionals, system administrators, and incident responders.
A comprehensive cheat sheet for accessing Windows systems from Linux hosts using smbclient and rpcclient tools, covering password management, user and group enumeration, and more.
APFS is a proprietary file system developed by Apple for macOS, offering improved performance, security, and reliability.
A quick reference guide for the VI editor, covering commands and modes.
A tool for testing and analyzing RFID and NFC tags, allowing users to read and write data, and perform various attacks and tests.
A comprehensive reference guide to Nmap's scripting engine and its various options, scripts, and target specifications.
A Microsoft framework for secure and efficient sharing of cybersecurity information between trusted parties to reduce cybersecurity risks.
BPF+ is a generalized packet filter framework that achieves both high-level expressiveness and good performance for network monitoring and intrusion detection applications.
A structured approach to managing and responding to suspected security events or incidents.
PINNED
Proton Pass is a cross-platform password manager that provides encrypted storage, password generation, and security monitoring features with integrated 2FA and dark web monitoring capabilities.
NordVPN is a commercial VPN service that encrypts internet connections and hides IP addresses through a global network of servers, featuring integrated threat protection and multi-device support.
Fractional CISO service that helps B2B companies implement security leadership to win enterprise deals, achieve compliance, and develop strategic security programs.
Checkmarx SCA
A software composition analysis tool that identifies vulnerabilities, malicious code, and license risks in open source dependencies throughout the software development lifecycle.
Orca Security
A cloud-native application protection platform that provides agentless security monitoring, vulnerability management, and compliance capabilities across multi-cloud environments.
DryRun
A GitHub application that performs automated security code reviews by analyzing contextual security aspects of code changes during pull requests.