veritas backup-exec CVE-2021-27876 is a vulnerability in Veritas Backup Exec
Published on March 1, 2021

An issue was discovered in Veritas Backup Exec before 21.2. The communication between a client and an Agent requires successful authentication, which is typically completed over a secure TLS communication. However, due to a vulnerability in the SHA Authentication scheme, an attacker is able to gain unauthorized access and complete the authentication process. Subsequently, the client can execute data management protocol commands on the authenticated connection. By using crafted input parameters in one of these commands, an attacker can access an arbitrary file on the system using System privileges.

Vendor Advisory NVD

Known Exploited Vulnerability

This Veritas Backup Exec Agent File Access Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Veritas Backup Exec (BE) Agent contains a file access vulnerability that could allow an attacker to specially craft input parameters on a data management protocol command to access files on the BE Agent machine.

The following remediation steps are recommended / required by April 28, 2023: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2021-27876 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

What is an authentification Vulnerability?

When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.

CVE-2021-27876 has been classified to as an authentification vulnerability or weakness.


Products Associated with CVE-2021-27876

You can be notified by stack.watch whenever vulnerabilities like CVE-2021-27876 are published in these products:

Veritas Backup Exec
 

What versions of Backup Exec are vulnerable to CVE-2021-27876?