Description

An improper protection of authentication tokens vulnerability exists in certain Ebyte gateway products. Authentication tokens used by the web management interface are insufficiently protected during client-side session handling, which may allow an attacker with access to exposed session information to obtain and reuse a valid token. Successful exploitation could allow an attacker to impersonate an authenticated user and gain unauthorized access to device management functionality.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-28T00:18:14.430Z",
  "pubdate": "2026-08-28T00:18:14.430Z",
  "executiveSummary": "This vulnerability involves the improper protection of authentication tokens within the web management interface of specific Ebyte gateway products. The flaw stems from insufficient security measures applied to session tokens during client-side handling, rendering them susceptible to unauthorized interception or access.\nThe primary risk entails unauthorized session hijacking. By obtaining exposed session identifiers, an attacker can impersonate an authenticated user without requiring valid credentials. This effectively bypasses standard authentication protocols, granting the attacker full control over the device management interface.\nThe vulnerability necessitates that an attacker gains access to session information, typically through network sniffing, cross-site scripting (XSS), or physical access to sensitive logs or local storage where tokens may be improperly cached or exposed. Once a valid token is acquired, the attacker can leverage it to conduct unauthorized administrative actions, modify system configurations, or exfiltrate sensitive data from the gateway. The impact is significant, as it results in a complete loss of confidentiality and integrity for the affected device management interface. Organizations utilizing these Ebyte gateways should treat this as a high-priority security concern, particularly in network environments where the web management interface is exposed to untrusted segments.",
  "technicalDetails": "The vulnerability resides within the session management mechanism of the Ebyte gateway's web administration interface. The root cause is a failure to enforce strict security policies regarding the storage, transmission, and lifecycle management of authentication tokens on the client side. By failing to secure these tokens, the application allows session identifiers to persist in insecure locations or transmit them in ways that make them observable by unauthorized parties.\nThe exploitation flow typically follows a reconnaissance and interception phase. First, an attacker must position themselves to capture the authentication token. This is achievable through various vectors, such as monitoring unencrypted traffic (if the interface utilizes cleartext HTTP), exploiting browser-based vulnerabilities that expose local storage or cookies, or accessing secondary logs where the token may have been inadvertently recorded.\nOnce the token is retrieved, the attacker performs an injection or replay attack. Because the Ebyte gateway does not sufficiently validate the context of the token against the original client session attributes, the server accepts the replayed token as legitimate. The attacker injects the hijacked session identifier into their own HTTP requests, typically via the 'Cookie' header or specific authorization parameters defined by the web management interface.\nUpon submission, the gateway's authentication component verifies the existence and validity of the stolen token against its active session state table. Since the token is valid, the server associates the attacker’s current connection with the authenticated session of the victim. This grants the attacker elevated privileges, allowing them to perform any action permitted to the authenticated user, such as modifying network routing tables, updating firmware, changing access credentials, or disabling security features.\nThe vulnerability is primarily characterized by a lack of secure attributes on session cookies (such as missing 'Secure', 'HttpOnly', or 'SameSite' flags) and improper implementation of session-to-IP binding or browser-fingerprinting validation. This allows a 'token-only' authentication model where the identity of the user is tied exclusively to the presence of the string rather than a cryptographically bound session context. As a result, the management interface is vulnerable to session hijacking whenever session token material is exposed to the local environment or intercepted over the network layer."
}