CVE-2023-28381 in Surf SOHO HW1
Summary
by MITRE • 10/25/2023
An OS command injection vulnerability exists in the admin.cgi MVPN_trial_init functionality of peplink Surf SOHO HW1 v6.3.5 (in QEMU). A specially crafted HTTP request can lead to command execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 10/31/2023
The vulnerability identified as CVE-2023-28381 represents a critical operating system command injection flaw within the peplink Surf SOHO HW1 device firmware version 6.3.5 running in QEMU emulation environment. This vulnerability specifically targets the admin.cgi MVPN_trial_init functionality, which serves as an administrative interface component responsible for managing VPN trial initialization processes. The flaw exists in the input validation mechanisms of this particular administrative script, creating a pathway for malicious command execution through improperly sanitized user inputs.
The technical implementation of this vulnerability stems from inadequate sanitization of HTTP request parameters passed to the MVPN_trial_init function within the admin.cgi interface. When an authenticated user submits a crafted HTTP request containing malicious command sequences, the system fails to properly validate or escape these inputs before incorporating them into system commands. This allows an attacker to inject arbitrary OS commands that execute with the privileges of the web server process, potentially escalating to full system compromise. The vulnerability operates at the application layer and leverages the inherent trust placed in authenticated administrative interfaces, making it particularly dangerous as it requires only valid authentication credentials to exploit.
From an operational impact perspective, this vulnerability creates significant risk for organizations utilizing peplink Surf SOHO HW1 devices in their network infrastructure. Successful exploitation enables attackers to execute arbitrary commands on the affected system, potentially leading to complete system compromise, data exfiltration, or use as a pivot point for further network infiltration. The authenticated nature of the attack means that an attacker must first obtain valid administrative credentials, but this requirement does not significantly mitigate the risk given that administrative accounts are often targeted in credential theft campaigns. The QEMU environment aspect suggests this vulnerability may be exploitable in virtualized deployments, potentially affecting multiple installations simultaneously.
Security practitioners should consider this vulnerability in relation to CWE-77 and CWE-88 which specifically address command injection flaws in operating systems and web applications respectively. The ATT&CK framework categorizes this vulnerability under T1059.001 for command and scripting interpreter and T1566.001 for spearphishing attachments, as exploitation typically requires authenticated access and may involve crafting malicious HTTP requests. Organizations should implement immediate mitigations including restricting administrative access to the device, implementing network segmentation, and applying firmware updates as they become available. The vulnerability highlights the importance of input validation and proper command execution practices in web applications, particularly in administrative interfaces where elevated privileges are granted. Network monitoring should be enhanced to detect anomalous HTTP request patterns that might indicate exploitation attempts, and access controls should be reviewed to ensure least privilege principles are maintained for administrative accounts.