X.org X11 Server Access Control improper authentication

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.4$0-$5k0.05

A vulnerability was found in X.org X11 Server (Windowing System Software) (affected version unknown). It has been rated as very critical. This issue affects an unknown functionality of the component Access Control Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

an x server s access control is disabled (e.g. through an "xhost +" command) and allows anyone to connect to the server.

The weakness was released 07/01/1997 as VU#704969 as confirmed advisory (CERT.org). It is possible to read the advisory at kb.cert.org. The identification of this vulnerability is CVE-1999-0526. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/04/2019). Due to its background and reception, this vulnerability has a historic impact.

It is declared as highly functional. The vulnerability scanner Nessus provides a plugin with the ID 19948 (X11 Server Unauthenticated Access), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (155) and Tenable (19948).

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 19948
Nessus Name: X11 Server Unauthenticated Access
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 15897
OpenVAS Name: Open X Server
OpenVAS File: 🔍
OpenVAS Family: 🔍

MetaSploit ID: open_x11.rb
MetaSploit Name: WinRM WQL Query Runner
MetaSploit File: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/01/1997 🔍
07/01/1997 +0 days 🔍
07/01/1997 +0 days 🔍
09/12/2002 +1899 days 🔍
10/08/2002 +25 days 🔍
10/10/2005 +1098 days 🔍
06/18/2014 +3173 days 🔍
05/04/2019 +1781 days 🔍

Sourcesinfo

Vendor: x.org

Advisory: VU#704969
Status: Confirmed

CVE: CVE-1999-0526 (🔍)
X-Force: 155
Vulnerability Center: 17 - Xhost Session Hijacking, Low
OSVDB: 309 - Multiple Vendor X Server Unauthenticated Access

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/18/2014 12:05
Updated: 05/04/2019 16:40
Changes: 06/18/2014 12:05 (74), 05/04/2019 16:40 (1)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Are you interested in using VulDB?

Download the whitepaper to learn more about our service!