CVE-2020-5222 – org.opencastproject:opencast-kernel

Package

Manager: maven
Name: org.opencastproject:opencast-kernel
Vulnerable Version: >=0 <7.6 || >=8.0 <8.1

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

EPSS: 0.0026 pctl0.49109

Details

Hard-Coded Key Used For Remember-me Token in Opencast ### Impact The security configuration in `etc/security/mh_default_org.xml` enables a remember-me cookie based on a hash created from the [username, password, and an additional system key](https://docs.spring.io/spring-security/site/docs/3.0.x/reference/remember-me.html). Opencast has hard-coded this system key in the large XML file and never mentions to change this, basically ensuring that all systems use the same key: ```xml <sec:remember-me key="opencast" user-service-ref="userDetailsService" /> ``` This means that an attacker getting access to a remember-me token for one server can get access to all servers which allow log-in using the same credentials without ever needing the credentials. For example, a remember-me token obtained from develop.opencast.org can be used on stable.opencast.org without actually knowing the log-in credentials. Such an attack will usually not work on different installations – assuming that safe, unique passwords are used – but it is basically guaranteed to work to get access to all machines of one cluster if a token from one machine is compromised. ### Patches This problem is fixed in Opencast 7.6 and Opencast 8.1 ### Workarounds We strongly recommend updating to the patched version. Still, as a workaround for older versions, in `etc/security/mh_default_org.xml`, set a custom key for each server: ```xml <sec:remember-me key="CUSTOM_RANDOM_KEY" user-service-ref="userDetailsService" /> ``` ### References - [Relevant lines in the security configuration](https://github.com/opencast/opencast/blob/161ee619382f144dc35eea211fc6b556025b98e1/etc/security/mh_default_org.xml#L335-L336) - [Spring Security Remember-Me Authentication Documentation](https://docs.spring.io/spring-security/site/docs/3.0.x/reference/remember-me.html#remember-me-hash-token) ### For more information If you have any questions or comments about this advisory: - Open an issue in [opencast/opencast](https://github.com/opencast/opencast/issues) - For security-relevant information, email us at [security@opencast.org](mailto:security@opencast.org) ### Thanks Thanks to @LukasKalbertodt for reporting the issue.

Metadata

Created: 2020-01-30T21:21:44Z
Modified: 2021-10-20T18:03:56Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/01/GHSA-mh8g-hprg-8363/GHSA-mh8g-hprg-8363.json
CWE IDs: ["CWE-798"]
Alternative ID: GHSA-mh8g-hprg-8363
Finding: F009
Auto approve: 1