CVE-2015-2681 in RT-G32
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the ASUS RT-G32 routers with firmware 2.0.2.6 and 2.0.3.2 allow remote attackers to inject arbitrary web script or HTML via the (1) next_page, (2) group_id, (3) action_script, or (4) flag parameter to start_apply.htm.
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Analysis
by VulDB Data Team • 05/01/2022
The CVE-2015-2681 vulnerability represents a critical cross-site scripting flaw affecting ASUS RT-G32 wireless routers running specific firmware versions. This vulnerability resides within the web-based administration interface of the router, creating a significant security risk for network administrators and end users who rely on these devices for network connectivity and management. The flaw manifests in the handling of user-supplied input parameters within the start_apply.htm page, which serves as a critical component for applying configuration changes to the router's settings.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the router's web interface. Attackers can exploit this weakness by manipulating four specific parameters: next_page, group_id, action_script, and flag. These parameters are processed by the router's embedded web server without proper sanitization, allowing malicious scripts to be injected directly into the response sent to the victim's browser. This injection occurs during the application of configuration changes, making the attack vector particularly insidious as it can be triggered through legitimate administrative functions.
The operational impact of CVE-2015-2681 extends beyond simple script injection, potentially enabling attackers to execute arbitrary code within the context of the router's administration interface. This vulnerability aligns with CWE-79, which describes cross-site scripting flaws, and can be mapped to ATT&CK technique T1059.007 for script injection. Successful exploitation could allow attackers to gain unauthorized access to router configuration settings, modify network parameters, redirect traffic, or even establish persistent access through the compromised device. The vulnerability affects both firmware versions 2.0.2.6 and 2.0.3.2, indicating a widespread issue across multiple releases of the RT-G32 router series.
Network security implications are severe as compromised routers can serve as entry points for broader network attacks, enabling man-in-the-middle scenarios and providing attackers with visibility into network traffic. The vulnerability can be exploited remotely without authentication, making it particularly dangerous in environments where routers are exposed to external networks. Organizations should consider implementing network segmentation and monitoring for unusual traffic patterns that might indicate exploitation attempts. The attack surface is further expanded by the fact that many users may not regularly update their router firmware, leaving these devices vulnerable for extended periods. Mitigation strategies should include immediate firmware updates from ASUS, network monitoring for suspicious requests to the router's administration interface, and implementing additional security controls such as firewalls and intrusion detection systems to protect against exploitation attempts.