CVE-2022-26953 in Passport
Summary
by MITRE • 04/06/2022
Digi Passport Firmware through 1.5.1,1 is affected by a buffer overflow. An attacker can supply a string in the page parameter for reboot.asp endpoint, allowing him to force an overflow when the string is concatenated to the HTML body.
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Analysis
by VulDB Data Team • 04/08/2022
The vulnerability identified as CVE-2022-26953 affects Digi Passport Firmware versions through 1.5.1, representing a critical buffer overflow flaw that resides within the reboot.asp web endpoint. This issue stems from inadequate input validation and improper string handling mechanisms that fail to properly constrain user-supplied data before processing. The specific attack vector involves manipulation of the page parameter through HTTP requests directed at the reboot.asp endpoint, where the system concatenates user-provided input directly into the HTML response body without sufficient bounds checking or sanitization measures.
The technical implementation of this vulnerability demonstrates a classic buffer overflow condition where the firmware fails to validate the length of the page parameter before incorporating it into memory structures used for HTML generation. This flaw operates under CWE-121, which categorizes buffer overflow conditions that occur when insufficient space is allocated for data storage, and aligns with CWE-787, which addresses out-of-bounds writes that can occur when data is written beyond the allocated buffer boundaries. The system's failure to implement proper input length validation creates an environment where an attacker can craft malicious payloads that exceed the allocated buffer space, potentially leading to memory corruption and arbitrary code execution.
Operationally, this vulnerability presents significant security implications for organizations utilizing Digi Passport devices in critical infrastructure environments. The attack surface is particularly concerning as it allows remote exploitation without requiring authentication, enabling an attacker to potentially gain control over device operations and system functionality. The reboot.asp endpoint serves as a critical access point for device management, making this vulnerability particularly dangerous as it could allow attackers to disrupt services, modify device configurations, or potentially escalate privileges within the system. The impact extends beyond simple denial of service as the buffer overflow could be leveraged to execute malicious code within the device's memory space.
The mitigation strategies for CVE-2022-26953 should prioritize immediate firmware updates from Digi to address the underlying buffer overflow condition. Organizations must implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Additional protective measures include deploying web application firewalls to filter malicious requests targeting the reboot.asp endpoint and implementing strict input validation policies that enforce length restrictions on all user-supplied parameters. Security monitoring should focus on detecting anomalous requests to the reboot.asp endpoint with unusually long page parameter values, as these could indicate attempted exploitation. The vulnerability also highlights the importance of following secure coding practices as outlined in the OWASP Top Ten and NIST Secure Coding guidelines, particularly concerning input validation and memory management. Organizations should conduct comprehensive vulnerability assessments to identify other endpoints that may exhibit similar buffer overflow characteristics and implement automated patch management processes to ensure timely remediation of such critical security flaws.