Multiple Vulnerabilities in Google Chrome Could Allow for Arbitrary Code Execution
MS-ISAC ADVISORY NUMBER:2021-091
OVERVIEW:Multiple vulnerabilities have been discovered in Google Chrome, the most severe of which could allow for arbitrary code execution. Google Chrome is a web browser used to access the Internet. Successful exploitation of the most severe of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser. Depending on the privileges associated with the application, an attacker could view, change, or delete data. If this application has been configured to have fewer user rights on the system, exploitation of the most severe of these vulnerabilities could have less impact than if it was configured with administrative rights.
THREAT INTELLIGENCE:Google stated that an exploit for CVE-2021-30563 exists in the wild.
- Google Chrome versions prior to 91.0.4472.164RISK:
- Large and medium government entities: HIGH
- Small government entities: HIGH
- Large and medium business entities: HIGH
- Small business entities: HIGH
TECHNICAL SUMMARY:Multiple vulnerabilities have been discovered in Google Chrome, the most severe of which could allow for arbitrary code execution. Details of the vulnerabilities are as follows:
- A use after free vulnerability exists in V8. (CVE-2021-30541)
- An out of bounds write vulnerability exists in ANGLE. (CVE-2021-30559)
- A use after free vulnerability exists in Blink XSLT. (CVE-2021-30560)
- A type confusion vulnerability exists in V8. (CVE-2021-30561, CVE-2021-30563)
- A use after free vulnerability exists in WebSerial. (CVE-2021-30562)
- A heap buffer overflow vulnerability exists in WebXR. (CVE-2021-30564)
RECOMMENDATIONS:We recommend the following actions be taken:
- Apply the stable channel update provided by Google to vulnerable systems immediately after appropriate testing.
- Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
- Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
- Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
- Apply the Principle of Least Privilege to all systems and services.
REFERENCES:Google: https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.html CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30541 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30559 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30560 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30561 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30562 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30563 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30564
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