CVE-2025-69205 identifies a vulnerability in the Micro Registration Utility (µURU), a telephone self-registration utility built on the Asterisk platform. The vulnerability stems from improper input validation (CWE-20) of federation names, which allows an attacker to inject special characters that Asterisk treats specially into the Dial() application. This injection can manipulate call routing logic, enabling an attacker to redirect calls between federating µURU instances. The attack requires that an administrator accepts the malicious federation request, introducing a prerequisite of privileged user interaction. The vulnerability affects all versions of µURU up to and including commit 88db9a953f38a3026bcd6816d51c7f3b93c55893. The impact of a successful attack is high, potentially compromising call confidentiality, integrity, and availability. However, the attack complexity is elevated due to the need for administrative approval and high privileges (PR:H). The CVSS v3.1 score is 6.3 (medium severity), with attack vector local, high attack complexity, required privileges, and user interaction. No known exploits are currently in the wild, and no official patch has been released at the time of publication. This vulnerability is categorized under CWE-20 (Improper Input Validation) and CWE-74 (Injection).

For European organizations, especially those relying on µURU for telephony federation across branches or partners, this vulnerability poses a significant risk. Successful exploitation can lead to unauthorized call redirection, enabling eavesdropping, call interception, or denial of service by disrupting legitimate call flows. This undermines confidentiality and integrity of communications, potentially exposing sensitive conversations or enabling fraud. The availability of telephony services may also be impacted if calls are misrouted or dropped. Given the requirement for administrative approval, insider threats or social engineering attacks targeting administrators could facilitate exploitation. The lack of a patch increases exposure duration. Organizations in sectors with high telephony usage such as finance, government, and critical infrastructure are particularly vulnerable. The medium CVSS score reflects the balance between impact and exploitation complexity, but the real-world impact could be severe if exploited in targeted attacks.

1. Implement strict policies and training to ensure administrators carefully validate and authenticate all federation requests before approval. 2. Employ network segmentation to isolate µURU instances and limit lateral movement in case of compromise. 3. Monitor and log all federation requests and call routing changes to detect suspicious activity promptly. 4. Apply input validation controls at the application level to sanitize federation names and reject inputs containing special characters or injection patterns. 5. Use multi-factor authentication and least privilege principles for administrative accounts managing federation requests. 6. Engage with the vendor or community to track patch releases and apply updates immediately once available. 7. Consider deploying compensating controls such as call anomaly detection systems to identify unusual call redirection patterns. 8. Conduct regular security assessments and penetration testing focused on telephony infrastructure to identify similar weaknesses.