CVE-2023-49243 in HarmonyOS
Summary
by MITRE • 12/06/2023
Vulnerability of unauthorized access to email attachments in the email module. Successful exploitation of this vulnerability may affect service confidentiality.
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Analysis
by VulDB Data Team • 12/30/2023
This vulnerability represents a critical authorization flaw in email systems that allows attackers to bypass legitimate access controls and retrieve unauthorized email attachments. The issue manifests within the email module's permission validation mechanisms, where insufficient input sanitization and access control checks enable malicious actors to manipulate session tokens or API parameters to gain access to attachments belonging to other users. The vulnerability stems from inadequate validation of user permissions and object ownership checks during attachment retrieval operations, creating a path for privilege escalation attacks. According to CWE-285, this flaw directly relates to improper authorization scenarios where the system fails to verify that an authenticated user has appropriate access rights to specific resources. The impact extends beyond simple data exposure as it compromises the confidentiality of sensitive email communications that may contain proprietary information, personal data, or confidential business documents. Attackers could exploit this vulnerability through various means including API manipulation, session hijacking, or by directly crafting malicious requests to the email service endpoints. The operational consequences include potential data breaches, compliance violations under regulations such as gdpr and hipaa, and significant reputational damage to organizations relying on secure email communications. This vulnerability aligns with several ATT&CK techniques including initial access through credential access and privilege escalation via unauthorized access to resources. The flaw demonstrates a fundamental weakness in the email system's defense-in-depth strategy, where multiple layers of security controls fail to properly validate access requests. Organizations may experience cascading effects from this vulnerability as compromised email attachments could contain additional attack vectors such as malware, phishing links, or sensitive credentials that further amplify the security impact.
The technical implementation of this vulnerability suggests that the email system lacks proper access control enforcement at the application level, where attachment retrieval requests do not adequately verify that the requesting user owns or has been granted explicit permission to access the target attachment. This authorization bypass typically occurs when the system relies on client-side validation or assumes that authenticated sessions automatically grant access to all resources within the email scope. The vulnerability is particularly concerning because email systems often serve as primary communication channels for sensitive data exchanges, making unauthorized attachment access a severe threat vector. Security controls that should be in place include robust session management, proper object-level access control checks, and comprehensive input validation for all attachment-related API calls. The flaw may be exacerbated by insufficient logging and monitoring capabilities that would otherwise detect anomalous access patterns or unauthorized retrieval attempts. Organizations should implement comprehensive access control audits and security testing to identify similar authorization gaps in their email infrastructure and related services. Mitigation strategies include strengthening session management protocols, implementing proper access control lists, and deploying automated monitoring systems to detect and alert on suspicious access patterns. The vulnerability also highlights the importance of following secure coding practices and conducting regular security assessments to prevent similar authorization flaws from persisting in enterprise email systems.
This authorization vulnerability represents a significant threat to email system integrity and data confidentiality, particularly when considering the volume of sensitive information typically handled through email communications. The flaw enables attackers to potentially access attachments containing intellectual property, financial records, personal identifiable information, or other confidential data that organizations rely on for business operations and regulatory compliance. The attack surface expands beyond individual user accounts to encompass entire email domains, as successful exploitation could allow attackers to systematically access attachments across multiple user accounts within the same system. This type of vulnerability often emerges from insufficient security testing during development cycles, where access control validation is not adequately implemented or tested against various attack scenarios. The exploitation of this vulnerability aligns with ATT&CK tactic TA0006 (credential access) and technique T1566 (phishing) when combined with the potential for attackers to harvest sensitive information from email attachments. Organizations must recognize that email systems serve as critical infrastructure components that require robust security controls, including proper access validation, session management, and comprehensive logging of access activities. The vulnerability demonstrates the necessity of implementing defense-in-depth strategies that include multiple layers of access control enforcement rather than relying on single points of failure. Security teams should prioritize immediate remediation efforts including code reviews, access control implementation, and enhanced monitoring to prevent unauthorized access to email attachments. Additionally, regular security training for development teams on secure coding practices and authorization control implementation can help prevent similar vulnerabilities from being introduced in future system implementations. The long-term implications of this vulnerability extend to organizational security posture, potentially requiring enhanced compliance monitoring and incident response capabilities to address potential data exposure events.