Veritas · Backup Exec Agent
CVE-2021-27876
Veritas Backup Exec Agent File Access Vulnerability
What it is
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.
CISA: 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.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: April 28, 2023
More exploited flaws from Veritas
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Apr 7, 2023 | Improper Authentication | Backup Exec Agent | High 8.2 | 65% |
| Apr 7, 2023 | Command Execution | Backup Exec Agent | High 8.8 | 24% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.