CVE-2020-3436: Malicious File Upload
First published: Wed Oct 21 2020(Updated: )
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.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Adaptive Security Appliance | <9.6.4.45 | |
| Cisco Firepower Threat Defense | <=6.2.2 | |
| Cisco Firepower Threat Defense | >=6.3.0<6.3.0.6 | |
| Cisco Firepower Threat Defense | >=6.4.0<6.4.0.10 | |
| Cisco Firepower Threat Defense | >=6.5.0<6.5.0.5 | |
| Cisco Firepower Threat Defense | =6.6.0 | |
| Cisco Adaptive Security Appliance Software | >=9.8.0<9.8.4.25 | |
| Cisco Adaptive Security Appliance Software | >=9.9.0<9.9.2.80 | |
| Cisco Adaptive Security Appliance Software | >=9.10.0<9.10.1.44 | |
| Cisco Adaptive Security Appliance Software | >=9.12.0<9.12.4.2 | |
| Cisco Adaptive Security Appliance Software | >=9.13.0<9.13.1.12 | |
| Cisco Adaptive Security Appliance Software | >=9.14.0<9.14.1.15 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-3436?
CVE-2020-3436 is a vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) and Cisco Firepower Threat Defense (FTD) Software that allows an unauthenticated, remote attacker to upload arbitrary-sized files to specific folders on an affected device.
What is the severity of CVE-2020-3436?
CVE-2020-3436 has a severity rating of 8.6 (High).
Which software versions are affected by CVE-2020-3436?
CVE-2020-3436 affects Cisco Adaptive Security Appliance versions up to 9.6.4.45 and Cisco Firepower Threat Defense versions up to 6.2.2.
How can an attacker exploit CVE-2020-3436?
An attacker can exploit CVE-2020-3436 by uploading arbitrary-sized files to specific folders on an affected device.
Where can I find more information about CVE-2020-3436?
More information about CVE-2020-3436 can be found on the Cisco Security Advisories and Alerts website.
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- canonical/cisco adaptive security appliance software
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- version/cisco adaptive security appliance software/9.9.0
- version/cisco adaptive security appliance software/9.10.0
- version/cisco adaptive security appliance software/9.12.0
- version/cisco adaptive security appliance software/9.13.0
- version/cisco adaptive security appliance software/9.14.0