CVE-2023-23635 : What You Need to Know

In Jellyfin 10.8.x through 10.8.3, there is a vulnerability where the name of a collection is susceptible to stored XSS. This flaw enables an attacker to retrieve access tokens from the localStorage of the targeted user.

Understanding CVE-2023-23635

This section delves into the specifics of CVE-2023-23635, highlighting its significance and implications.

What is CVE-2023-23635?

CVE-2023-23635 is a security vulnerability present in versions 10.8.x through 10.8.3 of the Jellyfin application. It involves a stored XSS vulnerability in the naming of collections, which can be exploited by malicious actors to extract access tokens from the victim's localStorage.

The Impact of CVE-2023-23635

The impact of CVE-2023-23635 could be severe as it allows attackers to potentially steal sensitive access tokens, compromising the security and privacy of users utilizing the vulnerable Jellyfin versions.

Technical Details of CVE-2023-23635

This section provides more technical insights into the vulnerability, including its description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in Jellyfin 10.8.x through 10.8.3 arises from improper input validation, which results in the execution of malicious scripts within the application environment, leading to stored XSS and token theft.

Affected Systems and Versions

The affected systems include versions 10.8.x through 10.8.3 of Jellyfin. All instances running these versions are susceptible to the stored XSS vulnerability in the collection naming feature.

Exploitation Mechanism

Exploiting CVE-2023-23635 involves crafting a special payload that is stored within the collection name. When a user interacts with the compromised collection, the payload executes, enabling the attacker to extract access tokens from the victim's localStorage.

Mitigation and Prevention

To address CVE-2023-23635, certain steps need to be taken to mitigate the risks associated with this vulnerability and prevent further exploitation.

Immediate Steps to Take

Users and administrators are advised to update their Jellyfin installations to a patched version that addresses the stored XSS vulnerability. Additionally, users should be cautious while interacting with collections containing suspicious or unexpected names.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security assessments, and staying informed about potential vulnerabilities in the software stack can help prevent similar security issues in the future.

Patching and Updates

It is crucial for Jellyfin users to apply the latest patches released by the vendor to safeguard their systems against CVE-2023-23635. Regularly updating the application ensures that known vulnerabilities are mitigated, enhancing overall security posture.