CVE-2022-31083 in Parse Server
Summary
by MITRE • 06/17/2022
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 4.10.11 and 5.2.2, the certificate in the Parse Server Apple Game Center auth adapter not validated. As a result, authentication could potentially be bypassed by making a fake certificate accessible via certain Apple domains and providing the URL to that certificate in an authData object. Versions 4.0.11 and 5.2.2 prevent this by introducing a new `rootCertificateUrl` property to the Parse Server Apple Game Center auth adapter which takes the URL to the root certificate of Apple's Game Center authentication certificate. If no value is set, the `rootCertificateUrl` property defaults to the URL of the current root certificate as of May 27, 2022. Keep in mind that the root certificate can change at any time and that it is the developer's responsibility to keep the root certificate URL up-to-date when using the Parse Server Apple Game Center auth adapter. There are no known workarounds for this issue.
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Analysis
by VulDB Data Team • 06/19/2022
The vulnerability CVE-2022-31083 affects Parse Server versions prior to 4.10.11 and 5.2.2, specifically targeting the Apple Game Center authentication adapter implementation. This represents a critical authentication bypass flaw that undermines the security of mobile application backends relying on Parse Server for user authentication. The issue stems from inadequate certificate validation mechanisms within the Game Center authentication flow, creating a pathway for malicious actors to impersonate legitimate Apple Game Center users. The vulnerability operates through a certificate trust chain manipulation where attackers can potentially substitute a fake certificate for Apple's legitimate certificate, allowing unauthorized access to user accounts that authenticate through the Game Center adapter. This flaw directly impacts the integrity of the authentication process and represents a failure in proper certificate validation practices.
The technical implementation of this vulnerability occurs within the Apple Game Center authentication adapter where the system fails to properly validate the certificate chain presented by Apple's Game Center services. Without proper certificate validation, the Parse Server accepts authentication requests even when the certificate presented does not originate from Apple's legitimate certificate authority. This vulnerability is categorized under CWE-295 which specifically addresses improper certificate validation, and aligns with ATT&CK technique T1550.002 for use of valid credentials and T1071.004 for application layer protocol. The authentication bypass mechanism allows attackers to construct a malicious authData object containing a URL pointing to a forged certificate hosted on Apple domains, effectively circumventing the normal authentication flow that should verify the certificate's authenticity through Apple's trusted certificate chain.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially enabling attackers to gain persistent access to user accounts within applications using Parse Server with Game Center authentication. This could result in data breaches, account takeovers, and unauthorized access to sensitive user information. The vulnerability particularly affects mobile applications that rely on Parse Server as their backend infrastructure and utilize Apple Game Center for user authentication. Attackers exploiting this vulnerability could potentially perform account enumeration, access user data, and perform actions on behalf of legitimate users. The risk is compounded by the fact that the vulnerability exists in widely deployed open source backend systems, making it a significant concern for organizations using Parse Server in production environments. Organizations may face regulatory compliance issues and potential legal consequences if user data is compromised through this authentication bypass mechanism.
The fix implemented in versions 4.10.11 and 5.2.2 introduces a new `rootCertificateUrl` property within the Apple Game Center auth adapter configuration. This enhancement requires developers to explicitly specify the root certificate URL for Apple's Game Center authentication, with a default value set to the certificate as of May 27, 2022. This approach provides a more secure certificate validation mechanism by ensuring that only certificates issued by Apple's trusted certificate authority are accepted. However, the solution requires ongoing maintenance as Apple may update their root certificates, making it the developer's responsibility to maintain current certificate URLs. Organizations should implement certificate monitoring processes and establish procedures for updating the `rootCertificateUrl` when Apple publishes new certificates. The mitigation strategy aligns with security best practices outlined in NIST SP 800-57 and ISO/IEC 27001, requiring continuous monitoring and updating of cryptographic certificates. Developers must also consider implementing automated certificate validation processes and regular security audits to ensure proper implementation of the new certificate validation mechanism.