CVE-2023-29501 in Jiyu Kukan Toku-Toku Coupon App
Summary
by MITRE • 06/13/2023
Jiyu Kukan Toku-Toku coupon App for iOS versions 3.5.0 and earlier, and Jiyu Kukan Toku-Toku coupon App for Android versions 3.5.0 and earlier are vulnerable to improper server certificate verification. If this vulnerability is exploited, a man-in-the-middle attack may allow an attacker to eavesdrop on an encrypted communication.
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Analysis
by VulDB Data Team • 12/10/2025
The vulnerability identified as CVE-2023-29501 affects mobile applications developed by Jiyu Kukan Toku-Toku for both iOS and Android platforms, specifically versions 3.5.0 and earlier across both operating systems. This represents a critical security flaw in the application's cryptographic implementation that directly undermines the integrity of secure communications between the mobile client and backend servers. The affected applications are designed to handle sensitive user data through encrypted connections, making proper certificate verification essential for maintaining data confidentiality and authentication.
The technical flaw manifests in the application's failure to properly validate SSL/TLS server certificates during the connection establishment process. This improper certificate verification allows the mobile application to accept invalid or untrusted certificates, effectively disabling the security mechanisms that should prevent malicious actors from intercepting encrypted communications. The vulnerability creates a trust relationship that can be exploited by attackers who can present fraudulent certificates to the application, thereby bypassing the normal security protocols that protect user data transmission.
From an operational perspective, this vulnerability exposes users to significant risks including data interception, session hijacking, and potential credential theft. The man-in-the-middle attack vector enabled by this flaw means that attackers can monitor and potentially modify communications between the mobile application and its servers without detection. This compromises the confidentiality and integrity of sensitive information that users expect to be protected through encrypted channels, potentially affecting user privacy, financial data, and personal information stored within the application ecosystem.
The vulnerability aligns with CWE-295 which specifically addresses improper certificate validation and certificate pinning failures in cryptographic implementations. This weakness falls under the broader category of cryptographic failures that can lead to severe security consequences when not properly addressed. The attack pattern corresponds to techniques documented in the MITRE ATT&CK framework under T1573.001 for "Reproduce or modify data in transit" and T1566.001 for "Phishing for Information" where attackers can exploit weak cryptographic implementations to gain unauthorized access to user communications.
Mitigation strategies should include immediate application updates to versions that properly implement certificate validation mechanisms, including proper certificate chain verification, hostname validation, and implementation of certificate pinning where appropriate. Organizations should also implement network monitoring to detect potential exploitation attempts and conduct thorough security audits of all mobile applications to identify similar cryptographic implementation flaws. Additionally, users should be advised to update their applications immediately and avoid using the affected versions until proper patches are applied to prevent potential exploitation of this vulnerability.