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NOTICE UPDATE

NIST has updated the NVD program announcement page with additional information regarding recent concerns and the temporary delays in enrichment efforts.

CVE-2023-6245 Detail

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.


Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  DFINITY Foundation
Base Score:  7.5 HIGH
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/dfinity/candid/blob/master/spec/Candid.md Product 
https://github.com/dfinity/candid/pull/478 Patch 
https://github.com/dfinity/candid/security/advisories/GHSA-7787-p7x6-fq3j Patch  Third Party Advisory 
https://internetcomputer.org/docs/current/references/candid-ref Product 
https://internetcomputer.org/docs/current/references/ic-interface-spec Product 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') cwe source acceptance level NIST   Reference acceptance level DFINITY Foundation  
CWE-20 Improper Input Validation Reference acceptance level DFINITY Foundation  
CWE-1288 Improper Validation of Consistency within Input Reference acceptance level DFINITY Foundation  
CWE-168 Improper Handling of Inconsistent Special Elements Reference acceptance level DFINITY Foundation  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-6245
NVD Published Date:
12/08/2023
NVD Last Modified:
12/13/2023
Source:
DFINITY Foundation