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CWA-2025-002.md

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CWA-2025-002: Malicious smart contract can slow down block production

Severity

Medium (Moderate + Likely)1

Affected versions:

  • wasmvm >= 2.2.0, < 2.2.2
  • wasmvm >= 2.1.0, < 2.1.5
  • wasmvm >= 2.0.0, < 2.0.6
  • wasmvm < 1.5.8

Patched versions:

  • wasmvm 1.5.8, 2.0.6, 2.1.5, 2.2.2

Description of the bug

The vulnerability can be used to slow down block production. The attack requires a malicious contract, so permissioned chains are unlikely to be affected.

(We'll add more detail once chains had a chance to upgrade.)

Patch

Applying the patch

The patch will be shipped in releases of wasmvm. You can update more or less as follows:

  1. Check the current wasmvm version: go list -m github.com/CosmWasm/wasmvm
  2. Bump the github.com/CosmWasm/wasmvm dependency in your go.mod to one of the patched version depending on which minor version you are on; go mod tidy; commit.
  3. If you use the static libraries libwasmvm_muslc.aarch64.a/libwasmvm_muslc.x86_64.a, update them accordingly.
  4. Check the updated wasmvm version: go list -m github.com/CosmWasm/wasmvm and ensure you see 1.5.8, 2.0.6, 2.1.5 or 2.2.2.
  5. Follow your regular practices to deploy chain upgrades.

The patch is consensus breaking and requires a coordinated upgrade.

Acknowledgement

This issue was found by meadow101 who reported it to the Cosmos Bug Bounty Program on HackerOne.

If you believe you have found a bug in the Interchain Stack or would like to contribute to the program by reporting a bug, please see https://hackerone.com/cosmos.

Timeline

  • 2024-11-24: Confio receives a report through the Cosmos bug bounty program maintained by Amulet.
  • 2024-12-20: Confio security contributors confirm the report.
  • 2024-01-27: Confio developed the patch internally.
  • 2025-02-04: Patch gets released.

Footnotes

  1. following Amulet's Severity Classification Framework ACMv1.2: https://github.com/interchainio/security/blob/0295254e8645301ccb606d46108a45cede0a73e0/resources/CLASSIFICATION_MATRIX.md ↩