CVE-2022-1579 is a high-severity vulnerability classified under CWE-639, which pertains to authorization bypass through user-controlled keys. The vulnerability exists in the 'Login Block IPs' product, specifically in the function check_is_login_page(). This function performs IP address checks by relying on HTTP headers to determine if a request originates from a login page. However, these headers can be easily spoofed by an attacker, allowing them to bypass authorization controls. Since the IP verification is based on user-controllable headers rather than more reliable sources such as the actual network layer IP address, an attacker can manipulate these headers to impersonate trusted IPs or circumvent IP-based restrictions. The CVSS 3.1 base score is 7.5, indicating a high severity level. The vector string (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) shows that the attack can be performed remotely over the network without any privileges or user interaction, and it impacts the integrity of the system by allowing unauthorized actions, though confidentiality and availability are not directly affected. No known exploits are reported in the wild, and no patches have been linked, suggesting that mitigation may require manual intervention or configuration changes. The vulnerability affects version 0 of the product, which may indicate an early or initial release. The core issue is the reliance on spoofable headers for security decisions, which is a common pitfall in web security, especially when headers like X-Forwarded-For or similar are not properly validated or trusted only from secure sources.

For European organizations, this vulnerability poses a significant risk if they use the 'Login Block IPs' product or similar IP-based login protection mechanisms that rely on HTTP headers for IP verification. An attacker exploiting this flaw can bypass login restrictions, potentially gaining unauthorized access to sensitive systems or administrative interfaces. This can lead to unauthorized changes, data integrity issues, or further lateral movement within the network. Since the vulnerability does not require authentication or user interaction and can be exploited remotely, it increases the attack surface considerably. Organizations in sectors with strict regulatory requirements, such as finance, healthcare, and critical infrastructure, may face compliance risks if unauthorized access leads to data manipulation or breaches. The lack of patches means organizations must rely on alternative mitigations to protect their environments. The impact is heightened in environments where IP-based login restrictions are a primary security control, as this vulnerability effectively nullifies that control.

To mitigate this vulnerability, European organizations should first identify if they are using the 'Login Block IPs' product or any similar IP-based login protection that relies on HTTP headers for IP verification. Immediate steps include: 1) Disable or avoid relying solely on IP-based login restrictions that use HTTP headers for IP determination. 2) Implement server-side validation of IP addresses using network-level information rather than HTTP headers, or ensure that headers are only trusted if coming from secure, internal proxies with strict validation. 3) Employ multi-factor authentication (MFA) to add an additional layer of security beyond IP restrictions. 4) Monitor login attempts and access logs for suspicious activity, especially from spoofed IP addresses. 5) If possible, apply custom patches or configuration changes to the affected product to avoid using spoofable headers for authorization decisions. 6) Network segmentation and strict firewall rules can limit exposure of login interfaces to trusted networks. 7) Engage with the vendor or community for updates or patches addressing this vulnerability. 8) Conduct regular security assessments and penetration testing to detect similar weaknesses in authentication mechanisms.