CVE-2020-8300 Auth bypass in Citrix ADC, Citrix Gateway

Medium 6.5 Published 16 Jun 2021 Updated 4 Aug 2024

Attackers can hijack SAML sessions via phishing to steal user access if Citrix ADC is configured as a SAML SP or IdP.

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-2020-8300?

CVE-2020-8300 is a medium-severity authentication bypass vulnerability in Citrix ADC, Citrix Gateway, published on 16 Jun 2021. 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

Citrix ADC and Citrix/NetScaler Gateway before 13.0-82.41, 12.1-62.23, 11.1-65.20 and Citrix ADC 12.1-FIPS before 12.1-55.238 suffer from improper access control allowing SAML authentication hijack through a phishing attack to steal a valid user session. Note that Citrix ADC or Citrix Gateway must be configured as a SAML SP or a SAML IdP for this to be possible.

Weakness: CWE-284

Which versions are affected by CVE-2020-8300?

It affects 3 products.

Products include Citrix Application Delivery Controller Firmware, Citrix Gateway, Citrix Netscaler Gateway.

How do I fix CVE-2020-8300?

No fix has been published for CVE-2020-8300 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-8300 being exploited?

There is no known exploitation of CVE-2020-8300 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-pq9q-4fcv-7rvj.