GHSA-7787-p7x6-fq3j

Suggest an improvement
Source
https://github.com/advisories/GHSA-7787-p7x6-fq3j
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-7787-p7x6-fq3j/GHSA-7787-p7x6-fq3j.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-7787-p7x6-fq3j
Aliases
Published
2023-12-08T15:23:22Z
Modified
2023-12-09T10:26:19.388920Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Candid infinite decoding loop through specially crafted payload
Details

Impact

The Candid library causes a Denial of Service while parsing a specially crafted payload with empty data type. For example, if the payload is record { * ; empty } and the canister interface expects record { * } then the rust candid decoder treats empty as an extra field required by the type. The problem with type empty is that the candid rust library wrongly categorizes empty as a recoverable error when skipping the field and thus causing an infinite decoding loop.

Canisters using affected versions of candid are exposed to denial of service by causing the decoding to run indefinitely until the canister traps due to reaching maximum instruction limit per execution round. Repeated exposure to the payload will result in degraded performance of the canister.

For asset canister users, dfx versions >= 0.14.4 to <= 0.15.2-beta.0 ships asset canister with an affected version of candid.

Unaffected

  • Rust canisters using candid < 0.9.0 or >= 0.9.10
  • Rust canister interfaces of type other than record { * }
  • Motoko based canisters
  • dfx (for asset canister) <= 0.14.3 or >= 0.15.2

Patches

The issue has been patched in 0.9.10. All rust based canisters on candid versions >= 0.9.0 must upgrade their candid versions to >= 0.9.10 and deploy their canisters to mainnet as soon as possible.

Workarounds

There is no workaround for canisters using the affected versions of candid other than upgrading to patched version.

References

Database specific
{
    "nvd_published_at": "2023-12-08T15:15:08Z",
    "cwe_ids": [
        "CWE-1288",
        "CWE-400",
        "CWE-835"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2023-12-08T15:23:22Z"
}
References

Affected packages

crates.io / candid

Package

Affected ranges

Type
SEMVER
Events
Introduced
0.9.0
Fixed
0.9.10