X.org 1.19.0 Entropy information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in X.org 1.19.0 and classified as problematic. The impacted element is an unknown function of the component Entropy. Such manipulation leads to information disclosure. This vulnerability is documented as CVE-2017-2624. The attack needs to be performed locally. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in X.org 1.19.0. Affected by this issue is an unknown code of the component Entropy. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality, integrity, and availability. CVE summarizes:

It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.

The bug was discovered 02/28/2017. The weakness was released 02/28/2017 by Eric Sesterhenn with X41 D-Sec GmbH as Advisory X41-2017-001: Multiple Vulnerabilities in X.org as confirmed mailinglist post (Full-Disclosure). The advisory is available at seclists.org. void GenerateRandomData(int len, char *buf) { int fd; fd = open("/dev/urandom", O_RDONLY); read(fd, buf, len); close(fd); } This vulnerability is handled as CVE-2017-2624 since 12/01/2016. The exploitation is known to be difficult. Local access is required to approach this attack. A simple authentication is needed for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 101949 (Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities (USN-3362-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196856 (Ubuntu Security Notification for Xorg-server, Xorg-server-hwe-16.04, Xorg-server-lts-xenial Vulnerabilities (USN-3362-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 6 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101949), SecurityFocus (BID 96480†) and SecurityTracker (ID 1037919†). Entries connected to this vulnerability are available at VDB-97342, VDB-97343, VDB-97344 and VDB-97345. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.8
VulDB Meta Temp Score: 5.7

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CNA Base Score: 5.9
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101949
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities (USN-3362-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for xorg-server USN-3362-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

12/01/2016 🔍
02/28/2017 +89 days 🔍
02/28/2017 +0 days 🔍
02/28/2017 +0 days 🔍
02/28/2017 +0 days 🔍
02/28/2017 +0 days 🔍
07/24/2017 +146 days 🔍
07/25/2017 +1 days 🔍
07/27/2018 +367 days 🔍
08/29/2025 +2590 days 🔍

Sourcesinfo

Advisory: Advisory X41-2017-001: Multiple Vulnerabilities in X.org
Researcher: Eric Sesterhenn
Organization: X41 D-Sec GmbH
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-2624 (🔍)
GCVE (CVE): GCVE-0-2017-2624
GCVE (VulDB): GCVE-100-97346
SecurityFocus: 96480 - X.org X Server Local Multiple Security Vulnerabilities
OSVDB: - CVE-2017-2624 - xorg-x11-server - Brute Force Issue
SecurityTracker: 1037919

See also: 🔍

Entryinfo

Created: 02/28/2017 20:24
Updated: 08/29/2025 16:56
Changes: 02/28/2017 20:24 (71), 08/18/2020 07:01 (17), 08/29/2025 16:56 (29)
Complete: 🔍
Cache ID: 216:EB5:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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