CVE-2025-6669 in sublinkX
Summary
by MITRE • 06/26/2025
A vulnerability was found in gooaclok819 sublinkX up to 1.8. It has been declared as problematic. This vulnerability affects unknown code of the file middlewares/jwt.go. The manipulation with the input sublink leads to use of hard-coded cryptographic key . The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 1.9 is able to address this issue. The patch is identified as 778d26aef723daa58df98c8060c43f5bf5d1b10b. It is recommended to upgrade the affected component.
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Analysis
by VulDB Data Team • 06/27/2025
CVE-2025-6669 represents a critical cryptographic vulnerability within the gooaclok819 sublinkX software stack, specifically affecting versions up to 1.8. This vulnerability resides in the middlewares/jwt.go file and stems from the improper handling of authentication tokens through the use of a hard-coded cryptographic key. The flaw manifests when the application processes sublink input parameters, creating a pathway for attackers to exploit the predetermined secret key used for JSON Web Token generation and validation. This represents a fundamental weakness in the security architecture that directly violates established cryptographic best practices and industry standards such as those outlined in CWE-327, which addresses the use of weak cryptographic algorithms and hardcoded keys. The vulnerability's remote exploitability means that attackers can potentially compromise authentication mechanisms without requiring physical access or local privileges, making it particularly dangerous in networked environments where the software operates. The attack complexity is rated as high, indicating that while the vulnerability exists, successful exploitation requires significant technical expertise and resources, though the public disclosure of exploitation methods has reduced the barrier to entry for threat actors. The fact that this vulnerability has been disclosed and is publicly available suggests that it may already be in use by malicious actors seeking to gain unauthorized access to systems relying on this software component. The exploitability difficulty level reflects the sophisticated nature of the attack vector, which likely involves crafting specific JWT tokens that can bypass the authentication mechanism through the hardcoded key. The patch identified through commit 778d26aef723daa58df98c8060c43f5bf5d1b10b addresses this issue by implementing proper key management practices, likely through dynamic key generation or secure key storage mechanisms. This remediation directly addresses the core problem of hardcoded cryptographic material and aligns with the principle of least privilege and secure key management as recommended in various cybersecurity frameworks including NIST SP 800-57 and ISO/IEC 14443. Organizations utilizing sublinkX versions 1.8 or earlier should urgently implement the upgrade to version 1.9 to mitigate this risk, as the hardcoded key vulnerability creates a persistent backdoor that could allow attackers to forge authentication tokens and gain unauthorized access to protected resources. The implications extend beyond simple credential theft, as JWT tokens are often used to authorize access to sensitive data and system functions, making this vulnerability a significant threat to overall system integrity and confidentiality. The attack surface is particularly concerning given that JWT tokens are commonly used in modern web applications and APIs, meaning that successful exploitation could potentially compromise entire application ecosystems. This vulnerability also aligns with ATT&CK technique T1566, which covers credential harvesting through social engineering and token manipulation, demonstrating how hardcoded cryptographic keys can serve as entry points for broader compromise activities. The remediation approach taken in version 1.9 should incorporate proper key rotation mechanisms, secure storage of cryptographic materials, and implementation of industry-standard secure coding practices to prevent similar issues from reoccurring in future releases.