Jitsi Meet Remote Code Execution Scanner

Jitsi Meet is a popular collection of free and open-source multiplatform applications used for voice, video conferencing, and instant messaging, predominantly across Web platforms. It is widely used for online meetings, webinars, and personal interactions by individuals, small businesses, and large enterprises. Its cross-platform compatibility and ease of use make it accessible for a wide range of users worldwide. Designed for maximum flexibility, it integrates smoothly with a variety of service providers for enhanced functionality. Users value its encryption and privacy features, which ensure secure communications. Due to its open-source nature, continuous improvements and features are consistently added by the community.

The Remote Code Execution vulnerability in Jitsi Meet is a critical security flaw that allows unauthorized users to execute arbitrary code remotely. This vulnerability arises from the integration and use of Apache Log4j, a Java-based logging utility. Exploitors typically use the JNDI APIs vulnerable to remote code loading through LDAP. Successfully exploiting this vulnerability can lead to total system control, unauthorized data access, and severe service disruption. It poses a high risk, as attackers need no authentication or direct user interaction to execute their code. Due to its critical nature, immediate action to mitigate this vulnerability is essential.

The vulnerability resides in the Apache Log4j library exploited via JNDI, which is a Java-based interface for directory services used in Jitsi Meet. Attackers manipulate the logging functionality with crafted request strings that make the system connect to malicious resources. The endpoint susceptible to this is typically an HTTP GET request made to the '/http-bind' path. Its exploitation relies on inducing the server to reach out to external, attacker-controlled resources, which then deliver executable or malicious payloads. Parameters like room identifiers and extended URLs are passed through interactsh, facilitating the methodology of attack.

If exploited, this vulnerability can cause unauthorized access and control over the application's hosting server, affecting any data or services provided by the system. The potential consequences include data breaches, loss of service, injection of malicious software, and unauthorized access to sensitive communication. System integrity and confidentiality get compromised, potentially leading to significant financial loss and reputational damage. In severe cases, continual exploitation could turn the system into a platform for further attacks on internal or external targets.

REFERENCES

• https://github.com/jitsi/security-advisories/blob/4e1ab58585a8a0593efccce77d5d0e22c5338605/advisories/JSA-2021-0004.md