Privilege escalation in Nessus Agent

Published: 2021-06-30

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-20099 CVE-2021-20100
CWE-ID	CWE-264
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Nessus Agent Client/Desktop applications / Other client software
Vendor	Tenable Network Security

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU54452

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20099

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nessus Agent: 8.0.0 - 8.2.4

CPE2.3

External links

https://www.tenable.com/security/tns-2021-12

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU54453