CVE-2022-29190 in DTLS
Summary
by MITRE • 05/21/2022
Pion DTLS is a Go implementation of Datagram Transport Layer Security. Prior to version 2.1.4, an attacker can send packets that sends Pion DTLS into an infinite loop when processing. Version 2.1.4 contains a patch for this issue. There are currently no known workarounds available.
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Analysis
by VulDB Data Team • 05/27/2022
The vulnerability identified as CVE-2022-29190 affects Pion DTLS, a popular Go implementation of the Datagram Transport Layer Security protocol used for securing communications over datagram protocols. This flaw represents a critical denial-of-service condition that can be exploited by remote attackers to disrupt service availability. The vulnerability exists in versions prior to 2.1.4, indicating that the developers identified and addressed this specific issue in their subsequent release. The affected implementation processes incoming packets in a manner that can lead to infinite loop conditions during DTLS packet handling, which fundamentally undermines the reliability and stability of systems relying on this security library.
The technical root cause of this vulnerability lies in the improper handling of malformed or specially crafted DTLS packets during the processing phase of the protocol implementation. When Pion DTLS encounters certain packet structures, the internal state machine or packet parsing logic enters a condition where it continuously loops without making progress, consuming CPU resources indefinitely. This behavior manifests as a denial-of-service condition where legitimate service operations are disrupted, and the system becomes unresponsive to further DTLS connections. The vulnerability is classified under CWE-835, which specifically addresses the issue of infinite loops in software implementations, making it particularly dangerous in network services where continuous operation is critical.
The operational impact of this vulnerability extends beyond simple service disruption to potentially affect the entire infrastructure relying on Pion DTLS for secure communications. Attackers can exploit this condition by sending carefully crafted packets to target systems, causing them to enter an infinite loop state that consumes significant computational resources. This can result in complete service unavailability, making it difficult for legitimate users to establish secure connections. The vulnerability is particularly concerning because it affects the core security protocol implementation, potentially compromising not only availability but also the overall security posture of systems that depend on DTLS for encrypted communications. Organizations using Pion DTLS in production environments face the risk of being unable to maintain secure communication channels, which could lead to data exposure or service interruption.
Mitigation strategies for this vulnerability center exclusively on upgrading to version 2.1.4 or later of the Pion DTLS library, as no effective workarounds exist for this specific issue. System administrators and security teams must prioritize updating their implementations to address this vulnerability promptly, as the infinite loop condition can be exploited remotely without requiring authentication or special privileges. The patch implemented in version 2.1.4 likely includes enhanced packet validation and state machine logic to prevent the conditions that lead to the infinite loop scenario. Organizations should conduct thorough testing of the updated library in their environments to ensure compatibility and verify that the vulnerability has been resolved. Additionally, monitoring systems should be configured to detect unusual CPU usage patterns that might indicate exploitation attempts, though the primary defense remains the immediate deployment of the patched version. This vulnerability demonstrates the importance of maintaining up-to-date security libraries and highlights the potential for seemingly minor implementation flaws to create significant operational risks in network security infrastructure.