Prototype Pollution research, performed with co-authorship by @_nikitastupin in Advanced Security Research team, is nominated to “Top 10 Web Hacking Techniques of 2021”. The opportunity for bug hunter, who found the research insightful, to support authors: https://t.co/HC1mSKAVk4
— Denis Makrushin (@makrushind) January 12, 2022
We discovered two more JS Prototype Pollution vulnerabilities in one more nmp-package: CVE-2020-28449, CVE-2020-28450. The package has ~200 weekly downloads, so the popularity level is limited. However, due to the patch is still unavailable check the details and make sure that your Node.js app is not affected.
Finally, the English version of “JavaScript prototype pollution: practice of finding and exploitation” article is prepared. Using the techniques Nikita Stupin discovered CVE-2020–28460 in multi-ini parser and a vulnerability in the merge-deep package. With the first one, everything went smoothly, but with the second one, a funny situation came out: after sending the report, the maintainer did not get in touch for a long time, and as a result, GitHub Security Lab found the same vulnerability, managed to reach the maintainer earlier and registered it (GHSL-2020–160). All details related to these vulnerabilities, discovery and exploitation techniques, and recommendations on how to protect your applications are collected in the article.
If you regularly monitor bug bounty reports, you’ve seen “JavaScript prototype pollution” titles. Nikita Stupin decided to dig deeper into the category of vulnerabilities, impacting JavaScript applications, and prepared the practical guide of its discovery and exploitation. Soon we will also prepare an English version of the paper, but currently, you have to manage by yourself to translate it.
