2021-30560 | Google Chrome Blink XSLT use after free

By Max On Jul 20, 2021

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$5k-$25k	2.37

A vulnerability was found in Google Chrome (Web Browser). It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Blink XSLT. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-416. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 07/17/2021. The advisory is shared at chromereleases.googleblog.com. This vulnerability is known as CVE-2021-30560 since 04/13/2021. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn’t need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/19/2021). It is expected to see the exploit prices for this product increasing in the near future.

Upgrading to version 91.0.4472.164 eliminates this vulnerability.

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