Executive Summary

Summary
Title Groupnotes Inc. Videostream Mac client allows for privilege escalation to root account
Informations
Name VU#757109 First vendor Publication 2023-08-28
Vendor VU-CERT Last vendor Modification 2023-08-28
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7
Base Score 7 Environmental Score 7
impact SubScore 5.9 Temporal Score 7
Exploitabality Sub Score 1
 
Attack Vector Local Attack Complexity High
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores

Detail

Overview

Groupnotes Inc. Videostream Mac client installs a LaunchDaemon that runs with root privileges. The daemon is vulnerable to a race condition that allows for arbitrary file writes. A low privileged attacker can escalate privileges to root on affected systems.

Description

Every five hours the Videostream LaunchDaemon runs with root privileges to check for updates. During the download, it's possible to replace the update file as any user with a crafted tar archive. The LaunchDaemon process will extract the archive and replace any requested file on the system.

Impact

An attacker with low privilege access can overwrite arbitrary files on the affected system. This can be leveraged to escalate privileges to control the root account.

Solution

The CERT/CC is currently unaware of a practical solution to this problem.

Acknowledgements

Thank you to Dan Revah for reporting this issue.

This document was written by Kevin Stephens.

Original Source

Url : https://kb.cert.org/vuls/id/757109

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 2

Alert History

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0
1
2
Date Informations
2023-08-29 00:36:05
  • Multiple Updates
2023-08-28 21:35:46
  • Multiple Updates
2023-08-28 21:22:07
  • First insertion