Executive Summary



This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Summary
Title Veritas Backup Exec is vulnerable to privilege escalation due to OPENSSLDIR location
Informations
Name VU#429301 First vendor Publication 2020-12-23
Vendor VU-CERT Last vendor Modification 2021-01-06
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Overall CVSS Score 8.8
Base Score 8.8 Environmental Score 8.8
impact SubScore 6 Temporal Score 8.8
Exploitabality Sub Score 2
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Changed Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Overview

Veritas Backup Exec contains a privilege escalation vulnerability due to the use of an OPENSSLDIR variable that specifies a location where an unprivileged Windows user can create files.

Description

CVE-2019-1552

Veritas Backup Exec includes an OpenSSL component that specifies an OPENSSLDIR variable as /usr/local/ssl/. On the Windows platform, this path is interpreted as C:\usr\local\ssl. Backup Exec contains a privileged service that uses this OpenSSL component. Because unprivileged Windows users can create subdirectories off of the system root, a user can create the appropriate path to a specially-crafted openssl.cnf file to achieve arbitrary code execution with SYSTEM privileges.

Impact

By placing a specially-crafted openssl.cnf in the C:\usr\local\ssl directory, an unprivileged user may be able to execute arbitrary code with SYSTEM privileges on a Windows system with the vulnerable Veritas software installed.

Solution

Apply an update

This vulnerability is addressed in Backup Exec 21.1 Hotfix 657517 (Engineering version 21.0.1200.1217) and Backup Exec 20.6 Hotfix 298543 (Engineering version 20.0.1188.2734).

Create a C:\usr\local\ssl directory

In cases where an update cannot be installed, this vulnerability can be mitigated by creating a C:\usr\local\ssl directory and restricting ACLs to prevent unprivileged users from being able to write to this location.

Acknowledgements

This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Original Source

Url : https://kb.cert.org/vuls/id/429301

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-434 Unrestricted Upload of File with Dangerous Type (CWE/SANS Top 25)
50 % CWE-295 Certificate Issues

Alert History

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Date Informations
2021-04-09 21:18:03
  • Multiple Updates
2021-01-06 21:29:06
  • Multiple Updates
2021-01-06 21:17:56
  • Multiple Updates
2020-12-24 00:17:34
  • Multiple Updates
2020-12-23 21:18:00
  • First insertion