CVE-2020-3427 Duo Authentication for Windows Logon and RDP Privilege Escalation Vulnerability
Local attackers can exploit path validation flaws in the installer to write to privileged directories, potentially achieving privilege escalation or causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-3427?
CVE-2020-3427 is a medium-severity path traversal vulnerability in Cisco Duo Authentication for Windows Logon and RDP, published on 14 Oct 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
The Windows Logon installer prior to 4.1.2 did not properly validate file installation paths. This allows an attacker with local user privileges to coerce the installer to write to arbitrary privileged directories. If successful, an attacker can manipulate files used by Windows Logon, cause Denial of Service (DoS) by deleting file(s), or replace system files to potentially achieve elevation of privileges. Note that this can only exploitable during new installations while the installer is running and is not exploitable once installation is finished. Versions 4.1.2 of Windows Logon addresses this issue.
Weakness: CWE-280
Which versions are affected by CVE-2020-3427?
It affects 1 product.
Products include Cisco Duo Authentication for Windows Logon and Rdp.
How do I fix CVE-2020-3427?
No fix has been published for CVE-2020-3427 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2020-3427 being exploited?
There is no known exploitation of CVE-2020-3427 in the wild and no public exploit code.
Other vulnerabilities in Cisco Duo Authentication for Windows Logon and RDP
Sources
Also known as GHSA-437m-6wfg-j372.