CVE-2020-3436 File upload in Cisco Adaptive Security Appliance (ASA) Software

High 8.6 Published 21 Oct 2020 Updated 13 Nov 2024

Unauthenticated remote attackers can upload large files to trigger a watchdog timeout and device reload, causing denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-3436?

CVE-2020-3436 is a high-severity vulnerability in Cisco Adaptive Security Appliance, published on 21 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to upload arbitrary-sized files to specific folders on an affected device, which could lead to an unexpected device reload. The vulnerability exists because the affected software does not efficiently handle the writing of large files to specific folders on the local file system. An attacker could exploit this vulnerability by uploading files to those specific folders. A successful exploit could allow the attacker to write a file that triggers a watchdog timeout, which would cause the device to unexpectedly reload, causing a denial of service (DoS) condition.

Weakness: CWE-434

Which versions are affected by CVE-2020-3436?

It affects 3 products.

Products include Cisco Adaptive Security Appliance, Cisco Adaptive Security Appliance Software, Cisco Secure Firewall Threat Defense.

How do I fix CVE-2020-3436?

No fix has been published for CVE-2020-3436 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-3436 being exploited?

There is no known exploitation of CVE-2020-3436 in the wild and no public exploit code.

All Cisco Adaptive Security Appliance vulnerabilities

Sources

Also known as GHSA-w8jp-qw34-jrrq.