CVE-2023-34356 in Surf SOHO HW1
Summary
by MITRE • 10/25/2023
An OS command injection vulnerability exists in the data.cgi xfer_dns 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.
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Analysis
by VulDB Data Team • 10/31/2023
The vulnerability identified as CVE-2023-34356 represents a critical operating system command injection flaw within the peplink Surf SOHO HW1 device firmware version 6.3.5 running in QEMU virtual environment. This security weakness resides specifically within the data.cgi xfer_dns functionality, which processes DNS transfer operations. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly handle maliciously crafted user-supplied data. When an authenticated attacker submits a specially constructed HTTP request containing malicious commands, the system processes these inputs without adequate filtering, leading to arbitrary command execution on the underlying operating system.
The technical implementation of this vulnerability demonstrates a classic command injection pattern where user-controllable parameters are directly incorporated into system commands without proper escaping or validation. The xfer_dns functionality likely accepts DNS server addresses or transfer parameters through the data.cgi interface, creating an attack surface where crafted input can bypass normal security controls. This flaw operates at the application layer and leverages the device's legitimate administrative functions to execute unauthorized system commands, potentially allowing full system compromise. The vulnerability's impact is amplified by the requirement for authentication, which means that an attacker must first establish valid credentials, though this still represents a significant security weakness given that legitimate administrative access is often available to authorized users.
From an operational perspective, this vulnerability creates substantial risk for organizations utilizing peplink Surf SOHO hardware in their network infrastructure. The authenticated command injection allows attackers to execute arbitrary code with the privileges of the web application process, which typically runs with elevated system permissions. Successful exploitation could enable attackers to install backdoors, exfiltrate sensitive network data, modify network configurations, or establish persistent access to the affected network segment. The QEMU environment suggests this vulnerability may also be exploitable in virtualized deployments, potentially affecting broader infrastructure. This type of vulnerability directly impacts the CIA triad by compromising confidentiality through data exfiltration, integrity through configuration modification, and availability through potential denial-of-service conditions.
Security professionals should consider this vulnerability in the context of CWE-77 and CWE-88, which specifically address command injection flaws and improper neutralization of special elements used in os command contexts. The attack vector aligns with ATT&CK technique T1059.001 for command and scripting interpreter, and T1566 for phishing with malicious attachments or links that could lead to exploitation. Organizations should implement immediate mitigations including firmware updates from peplink, network segmentation to limit access to administrative interfaces, and monitoring for suspicious HTTP requests containing unusual command sequences. Additionally, implementing web application firewalls and input validation controls can help detect and prevent exploitation attempts. The vulnerability highlights the importance of proper input sanitization and the principle of least privilege in network device security implementations, as well as the necessity for regular security assessments of network infrastructure components.