CVE-2025-26312 in Entera Devices
Summary
by MITRE • 03/14/2025
SendQuick Entera devices before 11HF5 are vulnerable to CAPTCHA bypass via the captcha parameter
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Analysis
by VulDB Data Team • 06/04/2025
The vulnerability identified as CVE-2025-26312 affects SendQuick Entera devices running firmware versions prior to 11HF5, presenting a critical security flaw in the authentication mechanism. This issue specifically targets the CAPTCHA validation process, which is designed to prevent automated attacks and ensure legitimate user access to the device management interfaces. The vulnerability allows attackers to bypass the CAPTCHA protection by manipulating the captcha parameter, effectively undermining the security controls that should prevent unauthorized access attempts.
The technical implementation of this vulnerability stems from insufficient input validation and parameter handling within the device's web interface authentication flow. When users attempt to access administrative functions or perform sensitive operations, the system should require successful CAPTCHA verification before proceeding. However, the flaw enables attackers to submit requests with manipulated captcha parameters that are accepted by the system without proper validation. This bypass mechanism operates at the application layer and can be exploited through various attack vectors including automated scripts and manual manipulation of HTTP requests.
The operational impact of this vulnerability is significant as it provides attackers with elevated privileges and access to administrative functions of the affected devices. Once bypassed, attackers can gain full control over device configurations, access sensitive data, modify system parameters, and potentially establish persistent access points within network environments. The vulnerability affects the integrity and confidentiality of device management operations, potentially allowing attackers to compromise entire network infrastructures that rely on these devices for security operations. This weakness particularly impacts environments where these devices serve as security gateways or network access control points.
Organizations should immediately implement firmware updates to version 11HF5 or later to remediate this vulnerability. Additionally, network administrators should consider implementing additional security controls such as rate limiting for authentication attempts, monitoring for suspicious CAPTCHA bypass patterns, and enhanced network segmentation to limit the potential impact of successful exploitation. The vulnerability aligns with CWE-346, which addresses the issue of improper verification of data integrity, and represents a clear violation of the principle of least privilege in authentication systems. From an attack perspective, this vulnerability maps to the attack technique T1110 in the MITRE ATT&CK framework, specifically targeting credential access through bypass of security controls. Organizations should also conduct thorough security assessments of their device inventories to identify all affected SendQuick Entera installations and implement comprehensive monitoring for potential exploitation attempts.