CVE - CVE-2023-6245

CVE-ID
CVE-2023-6245	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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 the 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. Note: Canisters written in Motoko are unaffected.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://github.com/dfinity/candid/blob/master/spec/Candid.md URL:https://github.com/dfinity/candid/blob/master/spec/Candid.md MISC:https://github.com/dfinity/candid/pull/478 URL:https://github.com/dfinity/candid/pull/478 MISC:https://github.com/dfinity/candid/security/advisories/GHSA-7787-p7x6-fq3j URL:https://github.com/dfinity/candid/security/advisories/GHSA-7787-p7x6-fq3j MISC:https://internetcomputer.org/docs/current/references/candid-ref URL:https://internetcomputer.org/docs/current/references/candid-ref MISC:https://internetcomputer.org/docs/current/references/ic-interface-spec URL:https://internetcomputer.org/docs/current/references/ic-interface-spec
Assigning CNA
Dfinity Foundation
Date Record Created
20231121	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20231121)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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