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CVE-2021-41168— Hash-Collision Denial-of-Service Vulnerability in snudown

Quick assessment

Affected
reddit snudown
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Snudown是开源的一个软件包。是 GitHub 使用的Sundown Markdown 解析器的 reddit 特定分支，添加了 Python 集成。 Snudown 存在加密问题漏洞，攻击者可以利用该漏洞进行 DoS 攻击。

CVSS 6.5 · Medium EPSS 0.79% · P54

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-41168

Vulnerability Information
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Vulnerability Title
Hash-Collision Denial-of-Service Vulnerability in snudown
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Snudown 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Snudown是开源的一个软件包。是 GitHub 使用的Sundown Markdown 解析器的 reddit 特定分支，添加了 Python 集成。 Snudown 存在加密问题漏洞，攻击者可以利用该漏洞进行 DoS 攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
reddit snudown < 1.7.0 -

II. Public POCs for CVE-2021-41168

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III. Intelligence Information for CVE-2021-41168

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Patches & Fixes for CVE-2021-41168 (1)

Vendor Advisories for CVE-2021-41168 (1)

IV. Related Vulnerabilities

Same weakness: CWE-400

V. Comments for CVE-2021-41168

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