CVE-2025-30472 in Corosync
Summary
by MITRE • 03/22/2025
Corosync through 3.1.9, if encryption is disabled or the attacker knows the encryption key, has a stack-based buffer overflow in orf_token_endian_convert in exec/totemsrp.c via a large UDP packet.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 06/07/2025
The vulnerability identified as CVE-2025-30472 represents a critical stack-based buffer overflow within the Corosync clustering software version 3.1.9 and earlier. This flaw exists in the orf_token_endian_convert function located within the exec/totemsrp.c source file, specifically manifesting when processing large UDP packets. The vulnerability becomes exploitable when encryption is either disabled or when an attacker has obtained the encryption key, creating a significant security risk for systems relying on Corosync for cluster communication and high availability services.
The technical implementation of this vulnerability stems from inadequate input validation and bounds checking within the network packet processing pipeline of Corosync's token handling mechanism. When the orf_token_endian_convert function processes UDP packets containing excessive data, it fails to properly validate the packet size against the allocated buffer space, allowing an attacker to overflow the stack buffer and potentially overwrite adjacent memory locations. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a fundamental memory safety issue that can lead to arbitrary code execution or system crashes.
The operational impact of this vulnerability extends beyond simple denial of service, as it creates a potential pathway for remote code execution when combined with the right conditions. Systems utilizing Corosync for clustering operations, particularly those running in high availability configurations, become susceptible to exploitation. The vulnerability affects the core communication protocols that maintain cluster integrity, potentially allowing attackers to disrupt cluster operations, escalate privileges, or gain unauthorized access to cluster nodes. This risk is particularly severe in enterprise environments where Corosync is used for mission-critical applications and services that require continuous availability.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and control communications, as exploitation could enable attackers to establish persistent access to cluster nodes. The attack surface is particularly concerning given that Corosync typically operates in environments where multiple nodes communicate over UDP, making packet injection attacks feasible. Organizations should implement immediate mitigation strategies including disabling encryption when unnecessary, implementing network segmentation to limit exposure, and monitoring for unusual UDP traffic patterns. Additionally, the vulnerability demonstrates the importance of proper input validation in network protocol implementations and highlights the need for comprehensive security testing of clustering and high availability systems. The remediation approach should involve updating to the patched version of Corosync, implementing network-level controls to restrict UDP packet sizes, and conducting thorough security assessments of all cluster communication components to identify similar vulnerabilities in related systems.