CVE-2020-26262 : Vulnerability Insights and Analysis

Coturn before version 4.5.2 is affected by a vulnerability that allows a malicious user to bypass loopback restrictions, potentially leading to unauthorized access.

Understanding CVE-2020-26262

This CVE identifies a security issue in Coturn that enables malicious users to relay packets to the loopback interface.

What is CVE-2020-26262?

Coturn, an open-source TURN and STUN Server implementation, prior to version 4.5.2, allows unauthorized relay of packets to loopback addresses, compromising system security.

The Impact of CVE-2020-26262

The vulnerability poses a high severity risk, with a CVSS base score of 7.2, enabling attackers to bypass loopback restrictions and potentially gain unauthorized access.

Technical Details of CVE-2020-26262

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from Coturn's failure to restrict relay of packets to loopback addresses, particularly when using specific peer addresses like

0.0.0.0

or

[::1]

.

Affected Systems and Versions

Product: Coturn
Vendor: Coturn
Versions Affected: < 4.5.2

Exploitation Mechanism

Malicious users can exploit the vulnerability by sending a

CONNECT

request with specific peer addresses, allowing them to relay packets to the loopback interface.

Mitigation and Prevention

Protect your systems from CVE-2020-26262 with these mitigation strategies.

Immediate Steps to Take

Update Coturn to version 4.5.2 or newer to patch the vulnerability.
Deny addresses in the block

0.0.0.0/8

,

[::1]

, and

[::]

by default.

Long-Term Security Practices

Regularly monitor and update your Coturn installation to stay protected against known vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches to address any identified vulnerabilities.