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A troubling new vulnerability has been discovered in major web browsers that could allow malicious sites to bypass network protections and access local services. The problem, linked to 0.0.0.0, could put both private and corporate devices at risk, requiring urgent protective measures.

Key Points:
- The 0.0.0.0 Day vulnerability affects major Web browsers and could compromise the security of local networks.
- This flaw exploits IP address 0.0.0.0 to bypass network protections and access internal services.
- The problem was first reported in 2006, but has never been permanently fixed.
- Users are advised to use HTTPS and restrict local network access to mitigate the risk.

Oligo Security researchers recently identified a critical vulnerability in the world’s most widely used browsers, including Chrome, Firefox and Safari. This flaw, called "0.0.0.0 Day," exploits non-standardized handling of network requests, allowing malicious websites to communicate directly with services running on the local network. This mechanism could allow attackers to execute remote code on local services, thus opening the door to unauthorized intrusions within private and corporate networks.

The problem stems from the IP address 0.0.0.0, traditionally reserved to indicate all network interfaces available on a device. However, due to a flaw in the handling of this address by browsers, an external site can use this IP to bypass implemented security measures and interact directly with a network’s internal services, such as routers or servers, without the user noticing. This anomalous behavior is not new: back in 2006, a user reported a similar problem to Mozilla, in which he claimed that a public website had attacked his router via the internal network. Although 18 years have passed since that first report, the vulnerability still remains open, demonstrating how a permanent solution has never been found.

The seriousness of this vulnerability lies in the fact that it potentially allows an attacker to access any device within the local area network, regardless of its nature, whether it is a computer, smartphone or IoT device. To protect against this threat, users and organizations need to take some immediate precautions. For example, it is critical to always use the HTTPS protocol to ensure a secure connection between the browser and the visited website. In addition, it is recommended to restrict access to the local network using firewalls or other access control tools to prevent unauthorized devices from interacting with internal services.

Below are the technical details of the vulnerability in a summary table:

Vulnerability name: 0.0.0.0 Day                                                                                                                                  
Browser affected: Chrome, Firefox, Safari                                                                                                                      
Technical description: Allows external websites to interact with services on the local network using IP address 0.0.0.0                                    
Potential impact: Unauthorized access to devices on the local network, execution of remote code                                                        
Temporary solutions: Using HTTPS protocol, restricting access to the local network using firewalls and other security tools                      

While browser developers work on a permanent fix, the discovery of this vulnerability raises significant concerns about local network security. It is essential that users take preventive measures to protect their devices until a patch is available.