Arbitrary file upload in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2020-3436
Published: October 21, 2020 / Updated: October 27, 2020
Vulnerability identifier: #VU47942
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-3436
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to the affected software does not efficiently handle the writing of large files to specific folders on the local file system. A remote attacker can upload a malicious file and cause a denial of service (DoS) condition on the target system.
Affected software
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Firewall Threat Defense (FTD)
How to mitigate CVE-2020-3436
Install updates from vendor's website.
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.6.4.45, 9.8.4.25, 9.9.2.80, 9.10.1.44, 9.12.4.2
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.3.0.6, 6.4.0.10, 6.5.0.5, 6.6.1
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.3.0.6, 6.4.0.10, 6.5.0.5, 6.6.1