libXdmcp up to 1.1.1 Session Key Entropy key management

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in libXdmcp up to 1.1.1. Affected by this issue is some unknown functionality of the component Session Key Handler. Performing a manipulation results in key management (Entropy). This vulnerability is reported as CVE-2017-2625. The attack requires a local approach. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in libXdmcp up to 1.1.1. This affects an unknown functionality of the component Session Key Handler. The manipulation with an unknown input leads to a key management vulnerability (Entropy). CWE is classifying the issue as CWE-320. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users' sessions.

The bug was discovered 02/28/2017. The weakness was disclosed 07/27/2018 with X41 D-Sec GmbH as not defined bug report (Bugzilla). The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2017-2625 since 11/30/2016. An attack has to be approached locally. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1600.001 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 32 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101569 (Fedora 26 : libXdmcp (2017-09f65e5e00)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236421 (Red Hat Update for X.org X11 libraries (RHSA-2017:1865)).

Upgrading to version 1.1.2 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101569) and SecurityFocus (BID 96480†). The entries VDB-97342, VDB-97343, VDB-97344 and VDB-97345 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: Entropy
Class: Key management / Entropy
CWE: CWE-320
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: 101569
Nessus Name: Fedora 26 : libXdmcp (2017-09f65e5e00)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for libXdmcp FEDORA-2017-bcb1999e65
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libXdmcp 1.1.2
Patch: cgit.freedesktop.org

Timelineinfo

11/30/2016 🔍
02/28/2017 +89 days 🔍
02/28/2017 +0 days 🔍
04/01/2017 +31 days 🔍
07/17/2017 +107 days 🔍
07/27/2018 +374 days 🔍
07/27/2018 +0 days 🔍
07/28/2018 +1 days 🔍
04/27/2023 +1734 days 🔍

Sourcesinfo

Advisory: FEDORA-2017-09f65e5e00
Organization: X41 D-Sec GmbH
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-2625 (🔍)
GCVE (CVE): GCVE-0-2017-2625
GCVE (VulDB): GCVE-100-122277
SecurityFocus: 96480 - X.org X Server Local Multiple Security Vulnerabilities
SecurityTracker: 1037919

See also: 🔍

Entryinfo

Created: 07/28/2018 07:13
Updated: 04/27/2023 12:22
Changes: 07/28/2018 07:13 (77), 03/10/2020 20:51 (5), 04/27/2023 12:07 (6), 04/27/2023 12:15 (12), 04/27/2023 12:22 (1)
Complete: 🔍
Cache ID: 216::103

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