CVE-2020-26234 Disabled Hostname Verification in OpenCast

What is CVE-2020-26234?

CVE-2020-26234 is a medium-severity vulnerability in opencast, published on 8 Dec 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Opencast before versions 8.9 and 7.9 disables HTTPS hostname verification of its HTTP client used for a large portion of Opencast's HTTP requests. Hostname verification is an important part when using HTTPS to ensure that the presented certificate is valid for the host. Disabling it can allow for man-in-the-middle attacks. This problem is fixed in Opencast 7.9 and Opencast 8.8 Please be aware that fixing the problem means that Opencast will not simply accept any self-signed certificates any longer without properly importing them. If you need those, please make sure to import them into the Java key store. Better yet, get a valid certificate.

Weakness: CWE-346

Which versions are affected by CVE-2020-26234?

4 open source packages ship an affected version, including org.opencastproject:opencast-kernel. It affects 1 product.

Products include Apereo Opencast.

How do I fix CVE-2020-26234?

Upgrade org.opencastproject:opencast-kernel to a fixed version for your release line: 7.9 or 8.9.

Is CVE-2020-26234 being exploited?

There is no known exploitation of CVE-2020-26234 in the wild and no public exploit code.

Other vulnerabilities in opencast

• CVE-2021-43821 Files Accessible to External Parties in Opencast Critical 9.9
• CVE-2020-5206 Authentication Bypass For Endpoints With Anonymous Access in OpenCast High 8.7
• CVE-2021-32623 Opencast vulnerable to billion laughs attack (XML bomb) High 8.1
• CVE-2020-5229 Opencast stores passwords using outdated MD5 hash algorithm High 7.7
• CVE-2020-5230 Opencast uses unsafe identifiers High 7.7

Sources

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

Also known as GHSA-44cw-p2hm-gpf6.