VDB-129082 · CVE-2019-6133 · RHSA-2019:0230

PolicyKit 0.115 Protection Mechanism polkitbackendinteractiveauthority.c fork access control

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.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in PolicyKit 0.115. This affects the function fork of the file polkitbackend/polkitbackendinteractiveauthority.c of the component Protection Mechanism. Executing a manipulation can lead to access control. This vulnerability is tracked as CVE-2019-6133. The attack is restricted to local execution. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in PolicyKit 0.115 and classified as critical. This vulnerability affects the function fork of the file polkitbackend/polkitbackendinteractiveauthority.c of the component Protection Mechanism. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In PolicyKit (aka polkit) 0.115, the "start time" protection mechanism can be bypassed because fork() is not atomic, and therefore authorization decisions are improperly cached. This is related to lack of uid checking in polkitbackend/polkitbackendinteractiveauthority.c.

The bug was discovered 01/09/2019. The weakness was disclosed 01/11/2019 by Jann Horn with Google (Website). The advisory is available at securityfocus.com. This vulnerability was named CVE-2019-6133 since 01/11/2019. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 121423 (Debian DLA-1644-1 : policykit-1 security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197387 (Ubuntu Security Notification for Linux, Linux-azure, Linux-gcp, Linux-kvm, Linux-raspi2 Vulnerabilities (USN-3903-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (121423) and SecurityFocus (BID 106537†). The entries VDB-127414, VDB-127475, VDB-127910 and VDB-130311 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

PolicyKit

Version

0.115

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.7
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 121423
Nessus Name: Debian DLA-1644-1 : policykit-1 security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: gitlab.freedesktop.org

Timelineinfo

01/09/2019 🔍
01/11/2019 +2 days 🔍
01/11/2019 +0 days 🔍
01/11/2019 +0 days 🔍
01/11/2019 +0 days 🔍
01/12/2019 +1 days 🔍
01/28/2019 +16 days 🔍
01/29/2019 +1 days 🔍
06/26/2023 +1609 days 🔍

Sourcesinfo

Advisory: RHSA-2019:0230⛔
Researcher: Jann Horn
Organization: Google
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-6133 (🔍)
GCVE (CVE): GCVE-0-2019-6133
GCVE (VulDB): GCVE-100-129082
SecurityFocus: 106537 - PolicyKit CVE-2019-6133 Unauthorized Access Vulnerability

See also: 🔍

Entryinfo

Created: 01/12/2019 13:15
Updated: 06/26/2023 13:07
Changes: 01/12/2019 13:15 (74), 04/29/2020 10:42 (8), 06/26/2023 13:07 (5)
Complete: 🔍
Cache ID: 216:41D:103

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