CVE-2013-6811 in DSL-6740U
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in the D-Link DSL-6740U gateway (Rev. H1) allow remote attackers to hijack the authentication of administrators for requests that change administrator credentials or enable remote management services to (1) Custom Services in Port Forwarding, (2) Port Triggering Entries, (3) URL Filters in Parental Control, (4) Print Server settings, (5) QoS Queue Setup, or (6) QoS Classification Entries.
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Analysis
by VulDB Data Team • 02/26/2024
The CVE-2013-6811 vulnerability represents a critical cross-site request forgery flaw affecting D-Link DSL-6740U gateway models with firmware revision H1. This vulnerability stems from insufficient CSRF protection mechanisms within the web-based administrative interface of the device, creating a significant security risk for network administrators who rely on this equipment for their network infrastructure. The flaw allows remote attackers to execute unauthorized administrative actions without proper authentication, potentially compromising the entire network infrastructure. The vulnerability specifically targets the device's administrative web interface, where multiple configuration sections lack proper CSRF token validation, making them susceptible to malicious exploitation.
The technical implementation of this vulnerability occurs through the absence of anti-CSRF tokens or other validation mechanisms in the affected administrative functions. When administrators perform actions such as modifying custom services in port forwarding, configuring port triggering entries, managing parental control URL filters, adjusting print server settings, or modifying QoS queue and classification entries, the web interface fails to verify that requests originate from legitimate administrative sessions. This absence of validation creates a pathway for attackers to craft malicious requests that, when executed by an authenticated administrator, can modify critical network settings. The vulnerability operates at the application layer and affects the device's web administration interface, where all six identified configuration sections lack proper CSRF protection mechanisms.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables attackers to fundamentally alter network security configurations that control access and traffic management. An attacker who successfully exploits this vulnerability can enable remote management services, modify firewall rules, adjust quality of service settings, and control access to network resources through parental controls. The potential for network compromise increases significantly as attackers can manipulate port forwarding rules to expose internal services to external networks, or modify QoS settings to disrupt network performance. This vulnerability effectively allows attackers to assume administrative control over the gateway, potentially leading to complete network infiltration and unauthorized access to connected devices.
Mitigation strategies for CVE-2013-6811 should focus on implementing proper CSRF protection mechanisms within the affected device's web interface. Organizations should immediately upgrade to firmware versions that include CSRF token validation and session management improvements, as provided by D-Link through their security advisory releases. Network administrators should also implement additional protective measures such as restricting administrative access to trusted IP addresses, implementing network segmentation, and monitoring for unusual administrative activities. The vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery weaknesses, and represents a critical concern under the ATT&CK framework's privilege escalation and defense evasion tactics. Regular security assessments and network monitoring should be conducted to detect potential exploitation attempts, as the vulnerability's impact can be catastrophic for network security posture and infrastructure integrity.