CVE-2020-3156 Cisco Identity Services Engine Cross-Site Scripting Vulnerability

Medium 6.1 Published 19 Feb 2020 Updated 15 Nov 2024

Unauthenticated remote attackers can execute arbitrary script code or access sensitive browser-based information via improper validation of endpoint data in logs.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2020-3156?

CVE-2020-3156 is a medium-severity cross-site scripting vulnerability in Cisco Identity Services Engine, published on 19 Feb 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A vulnerability in the logging component of Cisco Identity Services Engine could allow an unauthenticated remote attacker to conduct cross-site scripting attacks. The vulnerability is due to the improper validation of endpoint data stored in logs used by the web-based interface. An attacker could exploit this vulnerability by sending malicious endpoint data to the targeted system. An exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or to access sensitive, browser-based information.

Weakness: CWE-79

Which versions are affected by CVE-2020-3156?

It affects 1 product.

Products include Cisco Identity Services Engine.

How do I fix CVE-2020-3156?

No fix has been published for CVE-2020-3156 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2020-3156 being exploited?

There is no known exploitation of CVE-2020-3156 in the wild and no public exploit code.

All Cisco Identity Services Engine vulnerabilities

Sources

Also known as GHSA-v237-v8f4-gj29.