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GHSA-mx2j-7cmv-353c

Published Feb 4, 2025·Last modified Jul 9, 2025
Affected Components(0)

No affected components available

Description

CWA-2025-002

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

  • 1.5: https://github.com/CosmWasm/cosmwasm/commit/2b7f2faa57a1efc8207455c37f87f1eee6035a27
  • 2.0: https://github.com/CosmWasm/cosmwasm/commit/d6143b0aff16a39bbea4be37597d8e9d9b213d3b
  • 2.1: https://github.com/CosmWasm/cosmwasm/commit/f0c04c03cbe2557634c1bbcdc2ce203fe7caca58
  • 2.2: https://github.com/CosmWasm/cosmwasm/commit/a5d62f65b5eb947ebe40e2085b1c48a9d0a244d0

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.

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

Risk Scores
Base Score
0.0

Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.

Threat Intelligence
0.0

No exploitation activity has been observed at this time. Continue routine monitoring.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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