CVE-2024-33773 in DIR-619L
Summary
by MITRE • 05/14/2024
A buffer overflow vulnerability in /bin/boa on D-Link DIR-619L Rev.B 2.06B1 via formWlanGuestSetup allows remote authenticated users to trigger a denial of service (DoS) through the parameter "webpage."
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Analysis
by VulDB Data Team • 09/03/2024
The vulnerability identified as CVE-2024-33773 represents a critical buffer overflow flaw within the web management interface of D-Link DIR-619L Rev.B 2.06B1 routers. This issue resides in the /bin/boa binary which serves as the web server component for the device's administrative interface. The vulnerability specifically manifests when processing the formWlanGuestSetup parameter, which is used to configure guest wireless network settings. The affected device employs the boa web server software as its embedded HTTP server, making it susceptible to input validation flaws that can be exploited by authenticated users with access to the web interface.
The technical exploitation of this vulnerability occurs through manipulation of the "webpage" parameter within the formWlanGuestSetup form submission. When an authenticated user submits a specially crafted request containing an excessively long string in the webpage parameter, the application fails to properly validate the input length before copying it into a fixed-size buffer. This classic buffer overflow condition allows an attacker to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability. The vulnerability is classified as a buffer overflow under CWE-121, which specifically addresses stack-based buffer overflow conditions. The flaw demonstrates characteristics of CWE-787, indicating an out-of-bounds write condition that occurs when data is written beyond the boundaries of a fixed-length buffer.
From an operational perspective, this vulnerability presents a significant risk to network security and availability. While the attack requires prior authentication to the device's web interface, this authentication requirement does not sufficiently mitigate the threat given that the vulnerability can be exploited to cause a denial of service condition. The DoS attack can render the router's web management interface inaccessible, effectively preventing legitimate administrators from managing the device until the system is manually rebooted or the affected process is terminated. The impact extends beyond simple service disruption as it can compromise the overall network infrastructure, particularly in environments where the router serves as a critical network gateway. This vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and represents a significant threat to business continuity and network availability. The authenticated nature of the attack means that it could be exploited by insiders or compromised accounts, making it particularly dangerous in environments with less stringent access controls.
The mitigation strategies for this vulnerability should include immediate firmware updates from D-Link, which are expected to contain patches addressing the buffer overflow in the boa web server component. Network administrators should also implement additional security controls such as access control lists to restrict web interface access to trusted IP addresses, and consider disabling guest network functionality if it is not required. Monitoring for unusual login patterns or suspicious form submissions should be implemented to detect potential exploitation attempts. The vulnerability highlights the importance of input validation in embedded web server implementations and underscores the need for regular security assessments of network infrastructure devices. Organizations should also consider implementing network segmentation to limit the potential impact of such vulnerabilities and maintain robust backup and recovery procedures to quickly restore services in case of successful exploitation.