CVE-2021-27878

Published Mar 1, 2021

Last updated a month ago

Veritas Backup Exec

Overview

AI description

Automated description summarized from trusted sources.

CVE-2021-27878 is a vulnerability found in Veritas Backup Exec versions before 21.2. It relates to the communication process between a client and an agent, which usually requires secure TLS authentication. The vulnerability lies within the SHA Authentication scheme, which can allow an attacker to bypass the authentication process and gain unauthorized access. Once authenticated, the client can then execute data management protocol commands, potentially leading to arbitrary command execution on the system with system privileges.

Description: 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. The attacker could use one of these commands to execute an arbitrary command on the system using system privileges.
Source: cve@mitre.org
NVD status: Analyzed
Products: backup_exec

Risk scores

CVSS 3.1

Type: Primary
Base score: 8.8
Impact score: 5.9
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

CVSS 2.0

Type: Primary
Base score: 9
Impact score: 10
Exploitability score: 8
Vector string: AV:N/AC:L/Au:S/C:C/I:C/A:C

Known exploits

Data from CISA

Vulnerability name: Veritas Backup Exec Agent Command Execution Vulnerability
Exploit added on: Apr 7, 2023
Exploit action due: Apr 28, 2023
Required action: Apply updates per vendor instructions.

Weaknesses

nvd@nist.gov: NVD-CWE-noinfo

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "2E6F2EEE-7E5A-4EA1-87F2-97C26EAE8FCC",
            "versionEndExcluding": "21.2"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.