ASUS warns of critical remote authentication bypass on 7 routers

ASUS has released a new firmware update that addresses a vulnerability impacting seven router models that allow remote attackers to log in to devices.

The flaw, tracked as CVE-2024-3080 (CVSS v3.1 score: 9.8 “critical”), is an authentication bypass vulnerability allowing unauthenticated, remote attackers to take control of the device.

ASUS says the issue impacts the following router models: 

XT8 (ZenWiFi AX XT8) – Mesh WiFi 6 system offering tri-band coverage with speeds up to 6600 Mbps, AiMesh support, AiProtection Pro, seamless roaming, and parental controls. XT8_V2 (ZenWiFi AX XT8 V2) – Updated version of the XT8, maintaining similar features with enhancements in performance and stability. RT-AX88U – Dual-band WiFi 6 router with speeds up to 6000 Mbps, featuring 8 LAN ports, AiProtection Pro, and adaptive QoS for gaming and streaming. RT-AX58U – Dual-band WiFi 6 router providing up to 3000 Mbps, with AiMesh support, AiProtection Pro, and MU-MIMO for efficient multi-device connectivity. RT-AX57 – Dual-band WiFi 6 router designed for basic needs, offering up to 3000 Mbps, with AiMesh support and basic parental controls. RT-AC86U – Dual-band WiFi 5 router with speeds up to 2900 Mbps, featuring AiProtection, adaptive QoS, and game acceleration. RT-AC68U – Dual-band WiFi 5 router offering up to 1900 Mbps, with AiMesh support, AiProtection, and robust parental controls.

ASUS suggests that people update their devices to the latest firmware versions available on its download portals (links for each model above). Firmware update instructions are available on this FAQ page.

For those unable to update the firmware immediately, the vendor suggests they ensure their account and WiFi passwords are strong (over 10 non-consecutive characters long).

Moreover, it is recommended to disable internet access to the admin panel, remote access from WAN, port forwarding, DDNS, VPN server, DMZ, and port trigger.

One more vulnerability addressed on the same package is CVE-2024-3079, a high-severity (7.2) buffer overflow problem that requires admin account access to exploit.

Taiwan's CERT has also informed the public about CVE-2024-3912 in a post yesterday, which is a critical (9.8) arbitrary firmware upload vulnerability allowing unauthenticated, remote attackers to execute system commands on the device.

The flaw impacts multiple ASUS router models, but not all will be getting security updates due to them having reached their end-of-life (EoL).

The proposed solution per impacted model is:

DSL-N17U, DSL-N55U_C1, DSL-N55U_D1, DSL-N66U: Upgrade to firmware version 1.1.2.3_792 or later. DSL-N12U_C1, DSL-N12U_D1, DSL-N14U, DSL-N14U_B1: Upgrade to firmware version 1.1.2.3_807 or later. DSL-N16, DSL-AC51, DSL-AC750, DSL-AC52U, DSL-AC55U, DSL-AC56U: Upgrade to firmware version 1.1.2.3_999 or later. DSL-N10_C1, DSL-N10_D1, DSL-N10P_C1, DSL-N12E_C1, DSL-N16P, DSL-N16U, DSL-AC52, DSL-AC55: EoL date reached, replacement is recommended.

Download Master security updates

Finally, ASUS announced an update to Download Master, a utility used on ASUS routers that enables users to manage and download files directly to a connected USB storage device via torrent, HTTP, or FTP.

The newly released Download Master version 3.1.0.114 addresses five medium to high-severity issues concerning arbitrary file upload, OS command injection, buffer overflow, reflected XSS, and stored XSS problems.

Though none of those is as critical as CVE-2024-3080, it is recommended that users upgrade their utility to version 3.1.0.114 or later for optimal security and protection.