#VU74470 Improper Authentication in Backup Exec - CVE-2021-27876

Vulnerability identifier: #VU74470

Vulnerability risk: High

CVSSv4.0: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-27876

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Backup Exec
Client/Desktop applications / Multimedia software

Vendor: Veritas Technologies

Description

The vulnerability allows a remote user to compromise the affected system.

The vulnerability exists due to an error in SHA Authentication scheme. A remote user can use specially crafted input parameters on one of the data management protocol commands to access an arbitrary file on the system using System privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Backup Exec: 16 FP1 (16.0.1142.1327) - 21.1

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External links
https://www.veritas.com/content/support/en_US/security/VTS21-001#issue2

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.