Vulnerability identifier: #VU25656

Vulnerability risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3166

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco FXOS
Operating systems & Components / Operating system
Cisco Adaptive Security Appliance (ASA)
Hardware solutions / Security hardware applicances
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a local user to read or write arbitrary files on the target system.

The vulnerability exists due to insufficient validation of user-supplied input. A local user can include specially crafted arguments to a specific CLI command and read or write to arbitrary files on the underlying OS.

This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco FXOS Software:

• Firepower 1000 Series
• Firepower 2100 Series
• Firepower 4100 Series
• Firepower 9300 Security Appliances

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco FXOS: 2.2 - 2.6

Cisco Adaptive Security Appliance (ASA): 9.8 - 9.13

Cisco Firepower Threat Defense (FTD): 6.5.0, 6.4.0, 6.3.0, 6.2.3, 6.2.2

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-fxos-cli-file

---

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.