CVE-2020-27846 XML Processing error in github.com/crewjam/saml

What is CVE-2020-27846?

CVE-2020-27846 is a critical authentication bypass vulnerability in Fedoraproject Fedora, published on 21 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Weakness: CWE-115

Which versions are affected by CVE-2020-27846?

4 open source packages ship an affected version, including github.com/crewjam/saml and grafana. It affects 6 products.

Products include Fedoraproject Fedora, Grafana Grafana, Redhat Enterprise Linux, Redhat Openshift Container Platform, Redhat Openshift Service Mesh, Saml Project Saml.

How do I fix CVE-2020-27846?

Upgrade github.com/crewjam/saml to 0.4.3 or later.

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

Is CVE-2020-27846 being exploited?

There is no known exploitation of CVE-2020-27846 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-grafana-2020-27846, GHSA-4hq8-gmxx-h6w9, GO-2021-0058.