CVE-2019-20650 in R8900
Summary
by MITRE
Certain NETGEAR devices are affected by denial of service. This affects R8900 before 1.0.5.2, R9000 before 1.0.5.2, XR500 before 2.3.2.56, and XR700 before 1.0.1.20.
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Analysis
by VulDB Data Team • 05/26/2024
The vulnerability identified as CVE-2019-20650 represents a critical denial of service flaw affecting multiple NETGEAR router models including the R8900, R9000, XR500, and XR700 series. This weakness stems from insufficient input validation mechanisms within the affected firmware versions, creating opportunities for malicious actors to disrupt network services. The vulnerability specifically impacts devices running firmware versions prior to the mentioned patches, leaving thousands of enterprise and consumer networks exposed to potential disruption. The affected models represent high-end networking equipment commonly deployed in business environments and home networks where continuous connectivity is essential for operations.
The technical implementation of this vulnerability involves improper handling of network packets or configuration requests that trigger a system crash or reboot condition. Attackers can exploit this flaw by sending specially crafted network traffic or configuration commands that cause the device to enter an unstable state. This behavior aligns with CWE-129, Input Validation, and CWE-248, Uncaught Exception, as the system fails to properly validate incoming data or handle unexpected conditions during processing. The root cause typically involves buffer overflow conditions or unhandled error states within the device's network processing stack that leads to complete service interruption rather than merely degraded performance.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network availability for extended periods. Organizations relying on these routers for critical infrastructure may experience significant downtime during attack windows, affecting business continuity and productivity. The vulnerability's exploitation can occur remotely without requiring authentication, making it particularly dangerous for devices accessible from external networks. Network administrators may observe complete loss of network connectivity for connected devices, with affected routers requiring manual intervention or power cycling to restore normal operation. This type of vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1499, Network Denial of Service, and T1566, Phishing, when considering how attackers might initially gain access to vulnerable systems.
Mitigation strategies for this vulnerability require immediate firmware updates from NETGEAR to address the underlying implementation flaws. Organizations should prioritize patching affected devices through official firmware release channels, as these updates typically include enhanced input validation and improved error handling mechanisms. Network segmentation and firewall rules can provide temporary protection by limiting direct access to affected routers from untrusted networks. Additionally, implementing monitoring solutions that detect unusual network traffic patterns or device reboots can help identify exploitation attempts. The remediation process should include thorough testing of updated firmware in controlled environments before deployment to production networks. Security teams should also consider implementing network access controls that restrict administrative access to these devices to only trusted IP addresses and require multi-factor authentication for any access to configuration interfaces.