CVE-2021-1492 Duo Authentication Proxy Installer Denial of Service Vulnerability
Local attackers can exploit path validation flaws in the Duo Authentication Proxy installer to write to privileged directories, causing denial of service or privilege escalation.
- 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-2021-1492?
CVE-2021-1492 is a medium-severity path traversal vulnerability in Cisco Duo Authentication Proxy, published on 25 Mar 2021. 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 Duo Authentication Proxy installer prior to 5.2.1 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 Duo Authentication Proxy installer, cause Denial of Service (DoS) by deleting file(s), or replace system files to potentially achieve elevation of privileges. This is only exploitable during new installations, while the installer is running, and is not exploitable once installation has finished. Versions 5.2.1 of Duo Authentication Proxy installer addresses this issue.
Weakness: CWE-64
Which versions are affected by CVE-2021-1492?
It affects 1 product.
Products include Duo Authentication Proxy.
How do I fix CVE-2021-1492?
No fix has been published for CVE-2021-1492 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-2021-1492 being exploited?
There is no known exploitation of CVE-2021-1492 in the wild and no public exploit code.
Other vulnerabilities in Cisco Duo Authentication Proxy
Sources
Also known as GHSA-5hf3-34gj-8w5g.