CVE-2024-52813 in matrix-rust-sdk
Summary
by MITRE • 01/07/2025
matrix-rust-sdk is an implementation of a Matrix client-server library in Rust. Versions of the matrix-sdk-crypto Rust crate before 0.8.0 lack a dedicated mechanism to notify that a user's cryptographic identity has changed from a verified to an unverified one, which could cause client applications relying on the SDK to overlook such changes. matrix-sdk-crypto 0.8.0 adds a new VerificationLevel::VerificationViolation enum variant which indicates that a previously verified identity has been changed.
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Analysis
by VulDB Data Team • 01/07/2025
The matrix-rust-sdk represents a critical cryptographic library implementation that serves as the foundation for Matrix client-server communication protocols. This particular vulnerability affects the matrix-sdk-crypto Rust crate, which handles the cryptographic operations necessary for secure messaging within the Matrix ecosystem. The flaw exists in versions prior to 0.8.0 where the library fails to provide explicit notifications when a user's cryptographic identity transitions from a verified to an unverified state. This represents a significant gap in the security model that could allow malicious actors to exploit the lack of verification state awareness in client applications. The absence of proper state transition notifications creates a window of opportunity for attackers to manipulate cryptographic identities without alerting the client applications that depend on this library.
The technical implementation flaw stems from the missing VerificationLevel::VerificationViolation enum variant that was introduced in version 0.8.0. Prior to this fix, when a user's cryptographic identity changed from verified to unverified status, the system would not explicitly signal this transition to applications using the SDK. This creates a dangerous scenario where client applications might continue to trust cryptographic keys that have been compromised or modified without any indication of the change. The vulnerability directly impacts the integrity of the cryptographic verification process and undermines the fundamental security assumptions that client applications rely upon for secure communications. This issue aligns with CWE-254, which addresses weaknesses in cryptographic implementations related to insufficient validation of cryptographic state changes.
The operational impact of this vulnerability extends beyond simple notification failures to encompass potential security breaches in encrypted messaging systems. Client applications that depend on matrix-sdk-crypto may continue to maintain trust in compromised cryptographic identities, potentially allowing for man-in-the-middle attacks or impersonation scenarios. The lack of explicit verification violation detection means that users might remain unaware of security degradation in their communication channels, creating a false sense of security. This vulnerability particularly affects applications that implement automated security monitoring or user-facing verification status indicators, as these systems cannot accurately reflect the true cryptographic state of user identities. The issue also impacts compliance with security standards that require explicit notification of cryptographic state changes.
The mitigation strategy involves upgrading to matrix-sdk-crypto version 0.8.0 or later, which introduces the VerificationLevel::VerificationViolation enum variant to properly signal cryptographic identity changes. Organizations should implement comprehensive testing procedures to ensure that their applications correctly handle the new verification violation notifications and respond appropriately to cryptographic state transitions. Security teams should also establish monitoring protocols to detect when cryptographic identities change from verified to unverified states within their Matrix-based communication systems. This vulnerability demonstrates the importance of maintaining proper cryptographic state management and highlights the need for explicit notification mechanisms in security-critical libraries. The fix addresses fundamental security requirements outlined in the ATT&CK framework under credential access and defense evasion techniques, ensuring that applications can properly respond to cryptographic integrity violations and maintain secure communication channels.