CVE-2022-39063 : Security Advisory and Response

Open5GS UPF versions prior to 2.4.9 are impacted by a critical vulnerability that can lead to a segmentation fault. Attackers can exploit this flaw by sending a specially crafted PFCP Session Establishment Request, causing a memcpy() function to overwrite critical fields and trigger the fault.

Understanding CVE-2022-39063

This vulnerability affects Open5GS, particularly the UPF component, by mishandling data during the processing of specific requests, leading to a severe impact on system stability and security.

What is CVE-2022-39063?

In Open5GS UPF, a lack of proper length validation when copying data during PFCP Session Establishment Request processing can result in a segmentation fault due to an incorrect memcpy() call.

The Impact of CVE-2022-39063

Exploitation of this vulnerability could allow remote attackers to cause a denial of service (DoS) condition on the affected system, potentially disrupting network operations and services.

Technical Details of CVE-2022-39063

The vulnerability arises from the mishandling of f_teid_len values in incoming messages, leading to unintended consequences during the response building process.

Vulnerability Description

Open5GS UPF fails to verify the maximum length of f_teid values before copying them, allowing for potential buffer overflows and memory corruption.

Affected Systems and Versions

Versions of Open5GS UPF prior to 2.4.9 are vulnerable to this issue, highlighting the importance of updating to the latest secure releases.

Exploitation Mechanism

By sending a malformed PFCP Session Establishment Request, an attacker can manipulate f_teid_len values to trigger a memcpy() function with unintended consequences, causing a segmentation fault.

Mitigation and Prevention

To mitigate the risks associated with CVE-2022-39063, immediate action is necessary to secure Open5GS deployments and prevent potential exploitation.

Immediate Steps to Take

Deploy security patches or updates provided by Open5GS to address this vulnerability promptly and protect systems from exploitation.

Long-Term Security Practices

Implement rigorous input validation and boundary checks in network-facing components to prevent similar memory-related vulnerabilities in the future.

Patching and Updates

Regularly monitor for security advisories from Open5GS and apply recommended patches or updates to ensure ongoing protection against known vulnerabilities.