CVE-2023-39731 in Kaibutsunosato
Summary
by MITRE • 10/25/2023
The leakage of the client secret in Kaibutsunosato v13.6.1 allows attackers to obtain the channel access token and send crafted broadcast messages.
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Analysis
by VulDB Data Team • 01/26/2026
The vulnerability identified as CVE-2023-39731 represents a critical security flaw in the Kaibutsunosato application version 13.6.1 that stems from improper handling of client secrets during the authentication process. This weakness creates a scenario where sensitive authentication credentials can be exposed through insecure data transmission or storage mechanisms, allowing unauthorized parties to gain access to the application's channel access tokens. The issue manifests as a direct consequence of inadequate secret management practices that fail to implement proper encryption, obfuscation, or secure transmission protocols for sensitive authentication parameters.
The technical implementation of this vulnerability involves the exposure of client secrets through network traffic interception or insecure code practices where authentication tokens are either logged, cached, or transmitted without adequate security measures. This flaw enables attackers to capture the client secret through various means including man-in-the-middle attacks, packet inspection, or by exploiting insecure application code that does not properly sanitize or encrypt sensitive data during transmission. The vulnerability directly relates to CWE-312, which addresses the exposure of sensitive information through information leakage, and CWE-522, which covers insufficiently protected credentials.
The operational impact of this vulnerability extends beyond simple credential theft, as attackers who successfully obtain the client secret can leverage it to acquire channel access tokens that provide elevated privileges within the application's communication framework. Once armed with these tokens, malicious actors can execute unauthorized broadcast messaging operations, potentially leading to spam campaigns, data exfiltration, or service disruption. The ability to send crafted broadcast messages creates additional attack vectors where attackers can manipulate communication flows, deliver malicious payloads, or compromise the integrity of the application's messaging infrastructure. This vulnerability directly aligns with ATT&CK technique T1566, which covers credential harvesting through various attack vectors including network sniffing and code injection.
Mitigation strategies for CVE-2023-39731 require immediate implementation of secure secret management practices including the adoption of encrypted storage mechanisms, proper token rotation protocols, and secure transmission methods that utilize TLS 1.3 or higher encryption standards. Organizations should implement comprehensive monitoring systems to detect unauthorized access attempts and establish automated alerting for suspicious authentication patterns. The application should be updated to version 13.6.2 or later, which includes patches addressing the client secret exposure vulnerability through improved credential handling and secure storage mechanisms. Additionally, security teams should conduct thorough code reviews focusing on authentication flows, implement proper input validation for all sensitive data handling, and establish network segmentation to limit the potential impact of credential exposure. Regular penetration testing and vulnerability assessments should be conducted to identify similar weaknesses in related systems and ensure that the remediation efforts fully address the root cause of the vulnerability.