CVE-2021-41168
Assigner: GitHub_M
Published: 2021-10-21T20:10:12
State: PUBLISHED
affected: product: snudown
vendor: reddit
versions: status: affected
version: < 1.7.0
descriptions: value: Snudown is a reddit-specific fork of the Sundown Markdown parser used by GitHub, with Python integration added. In affected versions snudown was found to be vulnerable to denial of service attacks to its reference table implementation. References written in markdown ` [reference_name]: https://www.example.com` are inserted into a hash table which was found to have a weak hash function, meaning that an attacker can reliably generate a large number of collisions for it. This makes the hash table vulnerable to a hash-collision DoS attack, a type of algorithmic complexity attack. Further the hash table allowed for duplicate entries resulting in long retrieval times. Proofs of concept and further discussion of the hash collision issue are discussed on the snudown GHSA(https://github.com/reddit/snudown/security/advisories/GHSA-6gvv-9q92-w5f6). Users are advised to update to version 1.7.0.
metrics: cvssV3_1: attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
version: 3.1
problemTypes: descriptions: cweId: CWE-400
description: CWE-400: Uncontrolled Resource Consumption
type: CWE
descriptions: cweId: CWE-20
description: CWE-20: Improper Input Validation
type: CWE
descriptions: cweId: CWE-327
description: CWE-327: Use of a Broken or Risky Cryptographic Algorithm
type: CWE
source: advisory: GHSA-6gvv-9q92-w5f6
discovery: UNKNOWN
title: Hash-Collision Denial-of-Service Vulnerability in snudown