Products
ic_cdk
- 0.8.2
- 0.9.3
- 0.10.1
- 0.11.6
- 0.12.2
- 0.13.5
- 0.14.1
- 0.15.1
ic_cdk_timers
- UNKNOWN
Source
6b35d637-e00f-4228-858c-b20ad6e1d07b
Tags
CVE-2024-7884 details
Last Modified : Sept. 5, 2024, 5:45 p.m.
Description
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. PatchesThe 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. WorkaroundsThere 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. Upgrading the canisters (without updating `ic_cdk`) also frees the leaked memory but it's only a temporary solution.
CVSS Score
1 | 2 | 3 | 4 | 5 | 6 | 7.5 | 8 | 9 | 10 |
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Weakness
Weakness | Name | Description |
---|---|---|
CWE-401 | Missing Release of Memory after Effective Lifetime | The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. |
CVSS Data
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Base Score
7.5
Exploitability Score
3.9
Impact Score
3.6
Base Severity
HIGH
Vector String : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
URL | Source |
---|---|
https://docs.rs/ic-cdk/latest/ic_cdk/ | 6b35d637-e00f-4228-858c-b20ad6e1d07b |
https://github.com/dfinity/cdk-rs/pull/509 | 6b35d637-e00f-4228-858c-b20ad6e1d07b |
https://internetcomputer.org/docs/current/references/ic-interface-spec | 6b35d637-e00f-4228-858c-b20ad6e1d07b |