Hash-Collision Denial-of-Service Vulnerability in snudown

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

未加控制的资源消耗(资源穷尽)

Snudown 加密问题漏洞

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。

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