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.
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. This vulnerability is known to be actively exploited by threat actors. 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.
Products Associated with CVE-2021-27876
Want to know whenever a new CVE is published for Veritas Backup Exec? stack.watch will email you.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.