CVE-2020-19319 in 619L
Summary
by MITRE • 09/11/2023
Buffer overflow vulnerability in DLINK 619L version B 2.06beta via the FILECODE parameter on login.
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Analysis
by VulDB Data Team • 10/10/2023
A buffer overflow vulnerability exists in dlink 619l version b 2.06beta firmware that can be exploited through the FILECODE parameter during the login process. This vulnerability falls under the common weakness enumeration cwe-121 buffer underrun and represents a critical security flaw that allows remote attackers to execute arbitrary code on the affected device. The vulnerability occurs when the device fails to properly validate input length before copying data into fixed-size buffers, creating an opportunity for malicious actors to overwrite adjacent memory locations. The attack vector is particularly concerning as it targets the authentication process, potentially allowing unauthorized access to network devices and enabling further exploitation within the local network infrastructure.
The technical implementation of this vulnerability involves improper bounds checking during the handling of the FILECODE parameter in the login mechanism. When an attacker submits a maliciously crafted payload through this parameter, the system does not enforce adequate input validation or buffer size limitations. This allows the attacker to overflow the allocated memory space and potentially overwrite critical program execution data such as return addresses or function pointers. The exploitation can lead to complete system compromise, enabling attackers to gain administrative privileges, execute arbitrary commands, or even install persistent backdoors on the network device.
The operational impact of this vulnerability extends beyond simple unauthorized access, presenting significant risks to network security and integrity. Network administrators may lose control over critical infrastructure devices, potentially leading to data breaches, man-in-the-middle attacks, or denial-of-service conditions within the affected network segments. The vulnerability affects a specific firmware version that may be deployed in enterprise environments, making it particularly dangerous as organizations often rely on standardized network equipment for their security infrastructure. This flaw can enable attackers to establish persistent access points within networks, facilitating lateral movement and extended compromise of sensitive systems.
Mitigation strategies should include immediate firmware updates from dlink to address the identified buffer overflow vulnerability, implementing network segmentation to limit potential attack surfaces, and deploying intrusion detection systems to monitor for exploitation attempts. Network administrators should also consider disabling unnecessary services on affected devices and enforcing strict access controls through proper authentication mechanisms. The vulnerability aligns with several attack patterns in the mitre att&ck framework, particularly those related to privilege escalation and initial access vectors through network device exploitation. Organizations should conduct comprehensive vulnerability assessments of their network infrastructure to identify similar vulnerabilities across other network equipment and implement robust patch management processes to prevent future exploitation attempts.