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Category — firewall bypass
New NAT/Firewall Bypass Attack Lets Hackers Access Any TCP/UDP Service

New NAT/Firewall Bypass Attack Lets Hackers Access Any TCP/UDP Service

Nov 02, 2020
A new research has demonstrated a technique that allows an attacker to bypass firewall protection and remotely access any TCP/UDP service on a victim machine. Called  NAT Slipstreaming , the method involves sending the target a link to a malicious site (or a legitimate site loaded with malicious ads) that, when visited, ultimately triggers the gateway to open any TCP/UDP port on the victim, thereby circumventing browser-based port restrictions. The findings were revealed by privacy and security researcher Samy Kamkar over the weekend. "NAT Slipstreaming exploits the user's browser in conjunction with the Application Level Gateway (ALG) connection tracking mechanism built into NATs, routers, and firewalls by chaining internal IP extraction via timing attack or WebRTC, automated remote MTU and IP fragmentation discovery, TCP packet size massaging, TURN authentication misuse, precise packet boundary control, and protocol confusion through browser abuse," Kamkar said in ...
Firewall Bursting: A New Approach to Better Branch Security

Firewall Bursting: A New Approach to Better Branch Security

Dec 18, 2017
One of the most common network security solutions is the branch firewall. Branch firewall appliances can pack into a single device a wide range of security capabilities including a stateful or next-generation firewall, anti-virus, URL filtering, and IDS/IPS. But the reality is that most of these edge devices lack the processing power to apply the full scope of capabilities on all of the necessary traffic. If the firewall deployed in the branch cannot scale to address critical security needs, an alternative strategy must be used. Wholesale appliance upgrades are easy but expensive. Regional security hubs are complex and also costly. A new approach, called firewall bursting , leverages cloud scalability to offer an easier, more cost-effective alternative to branch office security. (You can find a great table comparing the different Firewall approaches here .) Costly Appliance Upgrades and Secure Hub Architectures The existing methods of evolving branch security force IT int...
Protecting Your Software Supply Chain: Assessing the Risks Before Deployment

Protecting Your Software Supply Chain: Assessing the Risks Before Deployment

Feb 11, 2025Software Security / Threat Intelligence
Imagine you're considering a new car for your family. Before making a purchase, you evaluate its safety ratings, fuel efficiency, and reliability. You might even take it for a test drive to ensure it meets your needs. The same approach should be applied to software and hardware products before integrating them into an organization's environment. Just as you wouldn't buy a car without knowing its safety features, you shouldn't deploy software without understanding the risks it introduces. The Rising Threat of Supply Chain Attacks Cybercriminals have recognized that instead of attacking an organization head-on, they can infiltrate through the software supply chain—like slipping counterfeit parts into an assembly line. According to the 2024 Sonatype State of the Software Supply Chain report , attackers are infiltrating open-source ecosystems at an alarming rate, with over 512,847 malicious packages detected last year alone—a 156% increase from the previous year. Traditional sec...
Cisco Exploit Leaked in NSA Hack Modifies to Target Latest Version of Firewalls

Cisco Exploit Leaked in NSA Hack Modifies to Target Latest Version of Firewalls

Aug 24, 2016
Recently released NSA exploit from " The Shadow Brokers " leak that affects older versions of Cisco System firewalls can work against newer models as well. Dubbed ExtraBacon , the exploit was restricted to versions 8.4.(4) and earlier versions of Cisco's Adaptive Security Appliance (ASA) – a line of firewalls designed to protect corporate, government networks and data centers. However, the exploit has now been expanded to 9.2.(4) after researchers from Hungary-based security consultancy SilentSignal were able to modify the code of ExtraBacon to make it work on a much newer version of Cisco's ASA software. Both Cisco and Fortinet have confirmed their firewalls are affected by exploits listed in the Shadow Brokers cache that contained a set of " cyber weapons " stolen from the Equation Group . The Equation Group is an elite hacking group tied to the NSA's offensive Tailored Access Operations (TAO) and linked to the previous infamous Regin and S...
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