CVE-2022-25219 : Exploit Details and Defense Strategies

A null byte interaction error has been discovered in Phicomm Routers that can lead to predictable ephemeral passwords. This vulnerability allows an unauthenticated attacker on the local network to exploit the issue and potentially spawn a telnet service.

Understanding CVE-2022-25219

This section provides insights into the nature of the vulnerability and its impact.

What is CVE-2022-25219?

The CVE-2022-25219 vulnerability in Phicomm Routers stems from a null byte interaction error, making ephemeral passwords predictable under certain conditions. By manipulating data processed by OpenSSL, an attacker can exploit this issue.

The Impact of CVE-2022-25219

The impact of this vulnerability is significant as it enables an unauthenticated attacker to potentially access the telnet service on the router and persist such access even after reboots. Successful exploitation depends on specific circumstances of data manipulation.

Technical Details of CVE-2022-25219

In this section, we delve into the technical aspects of the CVE-2022-25219 vulnerability.

Vulnerability Description

The vulnerability arises from a null byte interaction error in the telnetd_startup daemon's code within Phicomm Routers, allowing the manipulation of ephemeral passwords.

Affected Systems and Versions

Phicomm Routers versions K3 >= 21.5.37.246, K3C >= 32.1.22.113, K2P >= 20.4.1.7, K2 A7 >= 22.6.506.28, and K2G A1 >= 22.6.3.20 are affected by this vulnerability.

Exploitation Mechanism

An unauthenticated attacker can exploit the null byte interaction error by leveraging crafted UDP packets to make ephemeral passwords predictable with specific odds, ultimately gaining unauthorized access.

Mitigation and Prevention

In this final section, we outline steps to address and mitigate the CVE-2022-25219 vulnerability.

Immediate Steps to Take

Immediately apply appropriate patches or updates provided by Phicomm to mitigate the vulnerability and enhance system security.

Long-Term Security Practices

Implement strong security practices such as network segmentation, Principle of Least Privilege (PoLP), and regular security audits to safeguard against potential attacks.

Patching and Updates

Regularly monitor security advisories from Phicomm and promptly apply patches and updates to address known vulnerabilities and enhance overall system security.