GHSA-rwq6-crjg-9cpw
First published: Thu Sep 05 2024(Updated: )
When a canister method is called via `ic_cdk::call*`, a new Future `CallFuture` is created and can be awaited by the caller to get the execution result. Internally, the state of the Future is tracked and stored in a struct called `CallFutureState`. A bug in the polling implementation of the `CallFuture` allows multiple references to be held for this internal state and not all references were dropped before the `Future` is resolved. Since we have unaccounted references held, a copy of the internal state ended up being persisted in the canister's heap and thus causing a memory leak. ### Impact Canisters built in Rust with `ic_cdk` and `ic_cdk_timers` are affected. If these canisters call a canister method, use timers or heartbeat, they will likely leak a small amount of memory on every such operation. **In the worst case, this could lead to heap memory exhaustion triggered by an attacker.** Motoko based canisters are not affected by the bug. ### Patches The patch has been backported to all minor versions between `>= 0.8.0, <= 0.15.0`. The patched versions available are `0.8.2, 0.9.3, 0.10.1, 0.11.6, 0.12.2, 0.13.5, 0.14.1, 0.15.1` and their previous versions have been yanked. ### Workarounds There are no known workarounds at the moment. Developers are recommended to upgrade their canister as soon as possible to the latest available patched version of `ic_cdk` to avoid running out of Wasm heap memory. > [!NOTE] > Upgrading the canisters (without updating `ic_cdk`) also frees the leaked memory but it's only a temporary solution. ### References - [dfinity/cdk-rs/pull/509](https://github.com/dfinity/cdk-rs/pull/509) - [ic_cdk docs](https://docs.rs/ic-cdk/latest/ic_cdk/) - [Internet Computer Specification](https://internetcomputer.org/docs/current/references/ic-interface-spec)
| Affected Software | Affected Version | How to fix |
|---|---|---|
| rust/ic_cdk | >=0.15.0<0.15.1 | 0.15.1 |
| rust/ic_cdk | >=0.14.0<0.14.1 | 0.14.1 |
| rust/ic_cdk | >=0.13.0<0.13.4 | 0.13.5 |
| rust/ic_cdk | >=0.12.0<0.12.2 | 0.12.2 |
| rust/ic_cdk | >=0.11.0<0.11.5 | 0.11.6 |
| rust/ic_cdk | >=0.10.0<0.10.1 | 0.10.1 |
| rust/ic_cdk | >=0.9.0<0.9.3 | 0.9.3 |
| rust/ic_cdk | >=0.8.0<0.8.2 | 0.8.2 |
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Reference Links
- https://github.com/dfinity/cdk-rs/security/advisories/GHSA-rwq6-crjg-9cpw
- https://nvd.nist.gov/vuln/detail/CVE-2024-7884
- https://github.com/dfinity/cdk-rs/pull/509
- https://docs.rs/ic-cdk/latest/ic_cdk
- https://internetcomputer.org/docs/current/references/ic-interface-spec
- https://github.com/advisories/GHSA-rwq6-crjg-9cpw (Advisory)
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-rwq6-crjg-9cpw
- alias/CVE-2024-7884
- agent/software-canonical-lookup
- agent/weakness
- agent/last-modified-date
- agent/severity
- agent/references
- agent/softwarecombine
- agent/tags
- agent/type
- agent/description
- agent/first-publish-date
- agent/event
- package-manager/rust