#VU54451 Arbitrary file upload in Nessus Agent - CVE-2021-20106

Vulnerability identifier: #VU54451

Vulnerability risk: Low

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20106

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nessus Agent
Client/Desktop applications / Other client software

Vendor: Tenable Network Security

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload. A remote Nessus administrator user can upload a malicious file and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nessus Agent: 8.0.0 - 8.2.5

---

External links
https://www.tenable.com/security/tns-2021-13

---

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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