CVE-2021-39228
A vulnerability exists between versions 0.7.2 and 0.11.6.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.35% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-825
- Affected
- linuxfoundation/tremor
- Source
- security-advisories@github.com
References
- https://github.com/tremor-rs/tremor-runtime/commit/1a2efcdbe68e5e7fd0a05836ac32d2cde78a0b2ePatch, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/pull/1217Exploit, Patch, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/releases/tag/v0.11.6Release Notes, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/security/advisories/GHSA-mc22-5q92-8v85Mitigation, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/commit/1a2efcdbe68e5e7fd0a05836ac32d2cde78a0b2ePatch, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/pull/1217Exploit, Patch, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/releases/tag/v0.11.6Release Notes, Third Party Advisory
- https://github.com/tremor-rs/tremor-runtime/security/advisories/GHSA-mc22-5q92-8v85Mitigation, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.