# GHSA-2557-x9mg-76w8: ASA-2024-002: Default `PrepareProposalHandler` may produce invalid proposals when used with default `SenderNonceMempool` **Component**: C > An attacker can cause denial of service by submitting transactions with non-sequential sequence numbers, leading to invalid block proposals and reduced network production. - **Severity:** Not scored - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 21 Feb 2024 - **Also known as:** GO-2024-2571 ## What is GHSA-2557-x9mg-76w8? GHSA-2557-x9mg-76w8 is a vulnerability in github.com/cosmos/cosmos-sdk, published on 21 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description ## ASA-2024-002: Default `PrepareProposalHandler` may produce invalid proposals when used with default `SenderNonceMempool` **Component**: Cosmos SDK **Criticality**: Medium **Affected** Versions: Cosmos SDK versions <= 0.50.3; <= 0.47.8 **Affected** Users: Chain developers, Validator and Node operators **Impact**: Denial of Service ## Summary When using the default `PrepareProposalHandler` and the default `SenderNonceMempool`, an issue was identified which may allow invalid blocks to be proposed when a single sender includes multiple transactions with non-sequential sequence numbers in certain conditions. If this state is reached, it can lead to a reduction in block production for a network. ## Next Steps for Impacted Parties If you are a chain developer on an affected version of the Cosmos SDK, it is advised to update to the latest available version of the Cosmos SDK for your project. Once a patched version is available, it is recommended that network operators upgrade. A Github Security Advisory for this issue is available in the Cosmos-SDK [repository](https://github.com/cosmos/cosmos-sdk/security/advisories). For more information about Cosmos SDK, see https://docs.cosmos.network/. This issue was found by [KonradStaniec](https://github.com/KonradStaniec), [gitferry](https://github.com/gitferry), [SebastianElvis](https://github.com/SebastianElvis), and [vitsalis](https://github.com/vitsalis) who reported it to the Cosmos Bug Bounty Program on HackerOne on January 16, 2024. 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. ## Which versions are affected by GHSA-2557-x9mg-76w8? 5 open source packages ship an affected version, including github.com/cosmos/cosmos-sdk. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `github.com/cosmos/cosmos-sdk` | Go | All versions | 0.47.9, 0.50.4 | | `github.com/cosmos/cosmos-sdk` | Go | All versions | 0.47.9 | | `github.com/cosmos/cosmos-sdk` | Go | All versions | 0.47.9 | | `github.com/cosmos/cosmos-sdk` | Go | From 0.50.0 | 0.50.4 | | `github.com/cosmos/cosmos-sdk` | Go | From 0.50.0 | 0.50.4 | ## How do I fix GHSA-2557-x9mg-76w8? Upgrade github.com/cosmos/cosmos-sdk to a fixed version for your release line: 0.47.9 or 0.50.4. ## Is GHSA-2557-x9mg-76w8 being exploited? There is no known exploitation of GHSA-2557-x9mg-76w8 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for GHSA-2557-x9mg-76w8 and fix it if it is affected. What it is: GHSA-2557-x9mg-76w8 is a vulnerability in github.com/cosmos/cosmos-sdk, published on 21 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of GHSA-2557-x9mg-76w8 in the wild and no public exploit code. Affected packages and fixed versions: - github.com/cosmos/cosmos-sdk (Go): affected all versions; fixed in 0.47.9, 0.50.4 - github.com/cosmos/cosmos-sdk (Go): affected all versions; fixed in 0.47.9 - github.com/cosmos/cosmos-sdk (Go): affected all versions; fixed in 0.47.9 - github.com/cosmos/cosmos-sdk (Go): affected from 0.50.0; fixed in 0.50.4 - github.com/cosmos/cosmos-sdk (Go): affected from 0.50.0; fixed in 0.50.4 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/GHSA-2557-x9mg-76w8/ (Markdown: https://insights.sbomify.com/GHSA-2557-x9mg-76w8/index.md) ``` ## Sources - OSV: https://osv.dev/vulnerability/GHSA-2557-x9mg-76w8 --- From sbomify Insights: https://insights.sbomify.com/GHSA-2557-x9mg-76w8/ Summaries are generated and may contain mistakes; the official description above is the record.