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CVE-2021-27876

Status Candidate

Overview

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.

Related Files

Veritas Backup Exec Agent Remote Code Execution
Posted Sep 26, 2022
Authored by Alexander Korotin | Site metasploit.com

Veritas Backup Exec Agent supports multiple authentication schemes and SHA authentication is one of them. This authentication scheme is no longer used within Backup Exec versions, but had not yet been disabled. An attacker could remotely exploit the SHA authentication scheme to gain unauthorized access to the BE Agent and execute an arbitrary OS command on the host with NT AUTHORITY\SYSTEM or root privileges depending on the platform. The vulnerability presents in 16.x, 20.x and 21.x versions of Backup Exec up to 21.2 (or up to and including Backup Exec Remote Agent revision 9.3).

tags | exploit, remote, arbitrary, root
advisories | CVE-2021-27876, CVE-2021-27877, CVE-2021-27878
SHA-256 | 5d2a9879ee25f3f36daab21dabc7454caa668fe4871c215806df28dda8ea3890
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