CVE-2021-27876

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. By using crafted input parameters in one of these commands, an attacker can access an arbitrary file on the system using System privileges.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 8.1CVSS 3.1, Highfrom the CNA (mitre)CVSS:3.1/AC:L/AV:N/A:N/C:H/I:H/PR:L/S:U/UI:N

What to do

• Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 1 Mar 2021 Published
2. 7 Apr 2023 CVE-2021-27876 added to CISA KEV
3. 7 Apr 2023 Added to the CISA KEV catalogue

References

• www.veritas.comx_refsource_MISC
• packetstormsecurity.comx_refsource_MISC