GNOME Display Manager up to 3.18.1 Lock Screen Key Press access control

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 GNOME Display Manager up to 3.18.1. It has been rated as problematic. This issue affects some unknown processing of the component Lock Screen. This manipulation with the input Escape as part of Key Press causes access control. This vulnerability appears as CVE-2015-7496. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in GNOME Display Manager up to 3.18.1 and classified as problematic. Affected by this vulnerability is an unknown function of the component Lock Screen. The manipulation with the input value Escape leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

GNOME Display Manager (gdm) before 3.18.2 allows physically proximate attackers to bypass the lock screen by holding the Escape key.

The weakness was presented 11/24/2015 (Website). It is possible to read the advisory at download.gnome.org. This vulnerability is known as CVE-2015-7496 since 09/29/2015. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 86922 (FreeBSD : gdm -- lock screen bypass when holding escape key (68847b20-8ddc-11e5-b69c-c86000169601)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 256259 (CentOS Security Update for gnome-session (CESA-2017:2128)).

Upgrading to version 3.18.2 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (86922), SecurityFocus (BID 77623†) and Vulnerability Center (SBV-54741†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.7

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

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
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: 86922
Nessus Name: FreeBSD : gdm -- lock screen bypass when holding escape key (68847b20-8ddc-11e5-b69c-c86000169601)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 871165
OpenVAS Name: RedHat Update for gdm and gnome-session RHSA-2017:2128-01
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Display Manager 3.18.2

Timelineinfo

09/29/2015 🔍
11/17/2015 +49 days 🔍
11/17/2015 +0 days 🔍
11/18/2015 +1 days 🔍
11/19/2015 +1 days 🔍
11/24/2015 +5 days 🔍
11/24/2015 +0 days 🔍
11/25/2015 +1 days 🔍
12/02/2015 +7 days 🔍
06/27/2022 +2399 days 🔍

Sourcesinfo

Vendor: gnome.org

Advisory: RHSA-2017:2128
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-7496 (🔍)
GCVE (CVE): GCVE-0-2015-7496
GCVE (VulDB): GCVE-100-79303
SecurityFocus: 77623 - GNOME Display Manager CVE-2015-7496 Local Denial of Service Vulnerability
Vulnerability Center: 54741 - GNOME Display Manager (gdm) before 3.18.2 Local DoS in Log Screen, High

Entryinfo

Created: 11/25/2015 09:54
Updated: 06/27/2022 16:42
Changes: 11/25/2015 09:54 (61), 05/09/2018 12:00 (15), 06/27/2022 16:42 (3)
Complete: 🔍
Cache ID: 216::103

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