CVE-2019-19995 in IWR 3000N
Summary
by MITRE
A CSRF issue was discovered on Intelbras IWR 3000N 1.8.7 devices, leading to complete control of the router, as demonstrated by v1/system/user.
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Analysis
by VulDB Data Team • 03/17/2024
The vulnerability identified as CVE-2019-19995 represents a critical cross-site request forgery flaw within Intelbras IWR 3000N 1.8.7 wireless routers. This weakness resides in the device's web-based management interface and specifically affects the v1/system/user endpoint, which handles user account management operations. The flaw allows authenticated attackers to execute arbitrary commands on the affected device without proper authorization, potentially enabling full system compromise and unauthorized administrative control. The vulnerability stems from insufficient validation of request sources and lack of proper anti-CSRF token implementation within the router's web interface. This type of vulnerability falls under CWE-352, which specifically addresses Cross-Site Request Forgery issues, and aligns with ATT&CK technique T1078.004 for valid accounts and T1566.001 for credential harvesting through social engineering or compromised accounts. The attack surface is particularly concerning given that the affected device operates in residential and small office environments where network security may be inadequate.
The technical exploitation of this CSRF vulnerability occurs when an authenticated user visits a malicious website or clicks on a crafted link that triggers unauthorized requests to the vulnerable router's management interface. The attacker can leverage this flaw to modify user accounts, create new administrator accounts, or even reset the device configuration entirely. Since the vulnerability affects the v1/system/user endpoint, it provides access to core system functions that govern user authentication and authorization. The absence of proper CSRF protection mechanisms means that legitimate administrative actions can be performed without the user's knowledge or consent, effectively allowing attackers to assume complete control of the network device. The vulnerability is particularly dangerous because it operates at the system level rather than just affecting network configuration parameters, potentially enabling attackers to establish persistent access or redirect network traffic through the compromised router.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete network compromise and potential data exfiltration. An attacker who successfully exploits this CSRF flaw can establish backdoor access to the network, modify firewall rules, redirect traffic through malicious servers, or even use the compromised router as a pivot point for attacking other devices within the local network. The vulnerability affects not just the router itself but the entire network ecosystem that relies on its secure operation. Organizations and individuals using these devices face significant risks including unauthorized network monitoring, data interception, and potential use as a launching point for broader network attacks. The exploitation requires minimal technical expertise, making it particularly dangerous for widespread use in targeted attacks or automated exploitation campaigns.
Mitigation strategies for CVE-2019-19995 should prioritize immediate firmware updates from Intelbras to address the identified CSRF vulnerability. Network administrators should also implement additional security controls including disabling remote management interfaces, restricting access to management ports through firewall rules, and implementing network segmentation to limit the impact of potential compromise. The solution should include regular security assessments of network infrastructure and monitoring for unauthorized configuration changes. Organizations should consider implementing network access control measures and ensuring that all devices are configured with strong authentication credentials. Security teams should also establish incident response procedures specifically addressing device compromise scenarios and maintain updated vulnerability management processes to quickly address similar issues in other network equipment. The vulnerability highlights the critical need for proper input validation and anti-CSRF protection mechanisms in embedded web interfaces, particularly those handling sensitive system functions.