Vulnerability Description
Tremor is an event processing system for unstructured data. A vulnerability exists between versions 0.7.2 and 0.11.6. This vulnerability is a memory safety Issue when using `patch` or `merge` on `state` and assign the result back to `state`. In this case, affected versions of Tremor and the tremor-script crate maintains references to memory that might have been freed already. And these memory regions can be accessed by retrieving the `state`, e.g. send it over TCP or HTTP. This requires the Tremor server (or any other program using tremor-script) to execute a tremor-script script that uses the mentioned language construct. The issue has been patched in version 0.11.6 by removing the optimization and always cloning the target expression of a Merge or Patch. If an upgrade is not possible, a possible workaround is to avoid the optimization by introducing a temporary variable and not immediately reassigning to `state`.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Tremor | >= 0.7.2, < 0.11.6 |
Related Weaknesses (CWE)
References
- https://github.com/tremor-rs/tremor-runtime/commit/1a2efcdbe68e5e7fd0a05836ac32dPatchThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/pull/1217ExploitPatchThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/releases/tag/v0.11.6Release NotesThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/security/advisories/GHSA-mc22-5q92-8MitigationThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/commit/1a2efcdbe68e5e7fd0a05836ac32dPatchThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/pull/1217ExploitPatchThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/releases/tag/v0.11.6Release NotesThird Party Advisory
- https://github.com/tremor-rs/tremor-runtime/security/advisories/GHSA-mc22-5q92-8MitigationThird Party Advisory
FAQ
What is CVE-2021-39228?
CVE-2021-39228 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Tremor is an event processing system for unstructured data. A vulnerability exists between versions 0.7.2 and 0.11.6. This vulnerability is a memory safety Issue when using `patch` or `merge` on `stat...
How severe is CVE-2021-39228?
CVE-2021-39228 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-39228?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Tremor.