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CVE-2023-33193— Emby Server Proxy Header Spoofing Vulnerability

Quick assessment

Affected
EmbySupport security
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Emby Server是个人开发者的一款功能强大的媒体服务器。该产品主要可用于视频音频和照片等多媒体整合编辑。 Emby Server 4.7.12之前版本存在安全漏洞，该漏洞源于通过欺骗某些旨在与反向代理服务器互操作的标头，可能会影响本地/非本地网络的确定，以允许在没有密码的情况下登录或查看可能没有配置密码的用户帐户列表。

CVSS 9.1 · Critical EPSS 1.70% · P77

Public Exploits 1

Nuclei · 1 CVE-2023-33193.yaml [template]
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I. Basic Information for CVE-2023-33193

Vulnerability Information
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Vulnerability Title
Emby Server Proxy Header Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Emby Server is a user-installable home media server which stores and organizes a user's media files of virtually any format and makes them available for viewing at home and abroad on a broad range of client devices. This vulnerability may allow administrative access to an Emby Server system, depending on certain user account settings. By spoofing certain headers which are intended for interoperation with reverse proxy servers, it may be possible to affect the local/non-local network determination to allow logging in without password or to view a list of user accounts which may have no password configured. Impacted are all Emby Server system which are publicly accessible and where the administrator hasn't tightened the account login configuration for administrative users. This issue has been patched in Emby Server Beta version 4.8.31 and Emby Server version 4.7.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Emby Server 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Emby Server是个人开发者的一款功能强大的媒体服务器。该产品主要可用于视频音频和照片等多媒体整合编辑。 Emby Server 4.7.12之前版本存在安全漏洞，该漏洞源于通过欺骗某些旨在与反向代理服务器互操作的标头，可能会影响本地/非本地网络的确定，以允许在没有密码的情况下登录或查看可能没有配置密码的用户帐户列表。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
EmbySupport security < 4.7.12 -

II. Public POCs for CVE-2023-33193

# POC Description Source Link Shenlong Link
1 Emby Server is a user-installable home media server which stores and organizes a user's media files of virtually any format and makes them available for viewing at home and abroad on a broad range of client devices. This vulnerability may allow administrative access to an Emby Server system, depending on certain user account settings. By spoofing certain headers which are intended for interoperation with reverse proxy servers, it may be possible to affect the local/non-local network determination to allow logging in without password or to view a list of user accounts which may have no password configured. Impacted are all Emby Server system which are publicly accessible and where the administrator hasn't tightened the account login configuration for administrative users. This issue has been patched in Emby Server Beta version 4.8.31 and Emby Server version 4.7.12. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-33193.yaml POC Details
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III. Intelligence Information for CVE-2023-33193

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Vendor Advisories for CVE-2023-33193 (1)

IV. Related Vulnerabilities

Same product: security
Same vendor: EmbySupport
Same weakness: CWE-444