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Path Traversal in Archive Handling Leading to Code Execution

High
gnaegi published GHSA-x95v-2pgj-9x8j Aug 31, 2021

Package

No package listed

Affected versions

<15.5.3

Patched versions

15.3.18, 15.5.3

Description

Impact

Using a specially prepared ZIP file it is possible to overwrite any file that is writable by the application server user (e.g. the tomcat user). Depending on the configuration this can be limited to files of the OpenOlat user data directory, however, if not properly set up, the attack could also be used to overwrite application server config files, java code or even operating system files.

The attack could be used to corrupt or modify any OpenOlat file such as course structures, config files or temporary test data. Those attack would require in-depth knowledge of the installation and thus more theoretical.

If the app server configuration allows the execution of jsp files and the path to the context is known, it is also possible to execute java code.

If the app server runs with the same user that is used to deploy the OpenOlat code or has write permissions on the OpenOlat code files and the path to the context is know, code injection is possible.

The attack requires an OpenOlat user account to upload a ZIP file and trigger the unzip method. It can not be exploited by unregistered users.

Patches

The problem is fixed in version 15.3.18, 15.5.3 and 16.0. It is advised to upgrade to version 16.0.x

Workarounds

There are no known workarounds to fix this problem, an upgrade is necessary.

References

https://jira.openolat.org/browse/OO-5549 (only visible to members of the OpenOlat partner program)

For more information

If you have any questions or comments about this advisory:

Severity

High

CVE ID

CVE-2021-39180

Weaknesses

No CWEs

Credits