CVE-2023-48135 in mini-app on Line
Summary
by MITRE • 01/26/2024
An issue in mimasaka_farm mini-app on Line v13.6.1 allows attackers to send crafted malicious notifications via leakage of the channel access token.
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Analysis
by VulDB Data Team • 02/19/2024
The vulnerability identified as CVE-2023-48135 resides within the mimasaka_farm mini-app ecosystem operating on Line messaging platform version 13.6.1. This security flaw represents a critical exposure that enables malicious actors to exploit the application's notification system through unauthorized access to channel access tokens. The issue stems from improper token handling mechanisms that inadvertently expose sensitive authentication credentials to attackers who can leverage these tokens for unauthorized communication within the platform's infrastructure.
The technical exploitation of this vulnerability occurs through the leakage of channel access tokens which are typically used for authenticating API requests and managing communication channels within the LINE platform. When these tokens become accessible to unauthorized parties, attackers can craft and send malicious notifications to users who have interacted with the affected mini-app. This represents a significant breakdown in the platform's authentication and authorization mechanisms, allowing for potential abuse of the messaging infrastructure. The flaw specifically affects the mini-app's notification delivery system where the channel access token is not properly secured or validated before being used in notification transmission processes.
The operational impact of this vulnerability extends beyond simple notification spamming to encompass potential data exfiltration, user manipulation, and service disruption within the LINE ecosystem. Attackers can leverage the leaked tokens to send phishing notifications, distribute malware payloads, or manipulate user experiences within the mini-app environment. This capability creates a vector for social engineering attacks where users may be deceived into interacting with malicious content that appears legitimate due to the authentic channel credentials. The vulnerability essentially allows attackers to impersonate legitimate services within the LINE platform, undermining user trust and platform security.
Security professionals should consider this vulnerability in the context of CWE-284, which addresses improper access control mechanisms, and aligns with ATT&CK techniques related to privilege escalation and command and control communications. The flaw demonstrates inadequate input validation and token management practices that violate fundamental security principles of least privilege and secure credential handling. Organizations using the LINE platform should implement immediate mitigations including token rotation procedures, enhanced access control measures, and monitoring for unauthorized notification delivery attempts.
Mitigation strategies for CVE-2023-48135 should focus on implementing robust token lifecycle management including automatic token rotation, secure storage mechanisms, and comprehensive access logging. The platform should enforce strict validation of notification requests and implement rate limiting to prevent abuse of the notification system. Security teams must also establish monitoring protocols to detect unusual notification patterns that could indicate exploitation attempts. Additionally, developers should review and strengthen the authentication mechanisms within mini-apps to prevent unauthorized token leakage and ensure proper channel access controls are maintained throughout the application's lifecycle.