CVE-2025-30472

Remediation/Mitigation Strategy for CVE-2025-30472

1. Vulnerability Description:

  • CVE ID: CVE-2025-30472
  • Software Affected: Corosync (versions through 3.1.9)
  • Description: A stack-based buffer overflow vulnerability exists in the orf_token_endian_convert function within the exec/totemsrp.c file of Corosync. This vulnerability occurs when encryption is disabled or an attacker possesses the encryption key, allowing them to send a large UDP packet that overwrites the stack buffer.
  • Root Cause: The orf_token_endian_convert function does not properly validate the size of incoming UDP packets when encryption is disabled or the key is compromised, leading to a buffer overflow when processing excessively large packets.

2. Severity Assessment:

  • CVSS Score: 9.0 (Critical)
    • CVSS Vector: AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H (Based on data provided)
  • Severity: Critical
  • Impact:
    • Confidentiality: High - An attacker can potentially read sensitive information from the system’s memory.
    • Integrity: High - An attacker can potentially modify system files and configurations.
    • Availability: High - An attacker can potentially crash the Corosync service or even the entire system, leading to a denial-of-service.
  • Attack Vector: Network - Vulnerability is exploitable over the network.
  • Attack Complexity: High - Requires disabling of encryption or knowledge of the encryption key.

3. Known Exploits:

  • Currently, specific, publicly available exploit code is not confirmed. However, the nature of a stack-based buffer overflow is well-understood, and creating a working exploit given the source code and understanding of the vulnerability is considered possible.
  • Exploitation is possible if the attacker has access to the network, and can either force encryption to be disabled, or knows the configured encryption key.

4. Remediation and Mitigation Strategies:

Given the critical severity and potential for exploitation, the following steps are recommended:

  • A. Immediate Actions:

    • 1. Upgrade to a Fixed Version: Upgrade to a patched version of Corosync that addresses this vulnerability. Check the Corosync project website or your OS vendor for updated packages. If a specific patched version isn’t immediately available, monitor for announcements closely and apply the update as soon as it is released.

    • 2. Enable Encryption (Recommended): The most effective immediate mitigation is to ensure encryption is enabled and properly configured within Corosync. This significantly increases the attacker’s difficulty in exploiting the vulnerability, as they would need to decrypt the traffic before crafting a malicious packet.

    • 3. Review and Secure Key Management: If encryption is already enabled, review your key management practices. Ensure that encryption keys are stored securely and are not easily accessible to unauthorized individuals or processes. Rotate keys regularly as a best practice.

  • B. Long-Term Actions:

    • 1. Input Validation: After upgrading, examine the Corosync configuration to determine how input validation is being handled. Ensure strict size limits and format validation are enforced on all incoming UDP packets, regardless of the encryption status. This is a proactive step to prevent similar vulnerabilities in the future.

    • 2. Network Segmentation: Implement network segmentation to isolate the Corosync cluster from less trusted networks. This reduces the attack surface and limits the potential impact of a successful exploit.

    • 3. Intrusion Detection/Prevention Systems (IDS/IPS): Configure IDS/IPS rules to detect and block suspicious network traffic patterns that might indicate an attempt to exploit this vulnerability. Look for unusually large UDP packets originating from untrusted sources.

    • 4. Regular Security Audits: Conduct regular security audits of your Corosync configuration and the surrounding infrastructure to identify and address potential weaknesses. This includes reviewing access controls, network configurations, and key management practices.

    • 5. Monitor Logs: Enable verbose logging for Corosync and other related services. Monitor the logs for any errors or suspicious activity that might indicate an attempted exploit.

  • C. Workaround (If Upgrade is Not Immediately Possible):

    • If an immediate upgrade is not possible, consider the following workaround (which is less effective than an upgrade):

      • Firewall Rules: Implement strict firewall rules that limit the size of incoming UDP packets to the Corosync cluster. This might disrupt legitimate communication, so careful testing is required to determine an appropriate size limit that prevents exploitation without affecting functionality.

5. Testing and Validation:

  • After applying any remediation or mitigation measures, thoroughly test the Corosync cluster to ensure that the changes have not negatively impacted its functionality. This should include testing normal operations as well as simulating potential attack scenarios (e.g., sending large UDP packets) to verify that the vulnerability has been effectively addressed.

6. Reporting and Communication:

  • Report the vulnerability and your remediation efforts to the appropriate parties, including your organization’s security team, the Corosync project (if applicable), and any affected customers or partners. Share your findings and lessons learned to help improve the security posture of the broader community.

Assigner

Date

  • Published Date: 2025-03-22 00:00:00
  • Updated Date: 2025-03-25 16:15:27

More Details

CVE-2025-30472