CVE-2023-33193 : Security Advisory and Response
Critical vulnerability in Emby Server (CVE-2023-33193) allows unauthorized access. Learn impact, mitigation steps, and affected versions. Update to secure your system.
Emby Server is a user-installable home media server which stores and organizes a user's media files of virtually any format. A vulnerability in Emby Server, known as the Proxy Header Spoofing Vulnerability, has been identified.
Understanding CVE-2023-33193
This vulnerability allows for the spoofing of specific headers intended for interoperation with reverse proxy servers, potentially providing unauthorized administrative access to an Emby Server system.
What is CVE-2023-33193?
The Emby Server Proxy Header Spoofing Vulnerability, tracked as CVE-2023-33193, arises due to inconsistent interpretation of HTTP requests, specifically related to 'HTTP Request/Response Smuggling' (CWE-444). It impacts Emby Server systems that are publicly accessible and have lax account login configurations for administrative users.
The Impact of CVE-2023-33193
The vulnerability poses a critical risk with a CVSS base score of 9.1 out of 10. Attackers may exploit this flaw to gain unauthorized administrative privileges, compromising the confidentiality and integrity of data stored on the affected system.
Technical Details of CVE-2023-33193
The vulnerability has the following technical details:
Vulnerability Description
By spoofing specific headers, attackers can manipulate the local/non-local network determination, enabling unauthorized access to Emby Server systems, potentially without requiring a password.
Affected Systems and Versions
- Vendor: EmbySupport
- Product: security
- Vulnerable Versions: < 4.7.12, < 4.8.31
Exploitation Mechanism
Exploitation of this vulnerability involves the manipulation of HTTP headers to circumvent authentication mechanisms, gaining admin access.
Mitigation and Prevention
Addressing the Emby Server Proxy Header Spoofing Vulnerability requires immediate action to enhance security measures.
Immediate Steps to Take
- Update Emby Server to the patched versions: Emby Server Beta 4.8.31 or Emby Server 4.7.12.
- Tighten account login configurations for administrative users.
Long-Term Security Practices
- Regularly monitor and update Emby Server to the latest versions.
- Implement network security measures to prevent unauthorized access.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by EmbySupport to mitigate the vulnerability.