MS-ISAC CYBERSECURITY ADVISORIES

MS-ISAC ADVISORY NUMBER:
2015-124

DATE(S) ISSUED:
10/13/2015

SUBJECT:
Multiple Vulnerabilities in Google Chrome Could Allow for Arbitrary Code Execution

OVERVIEW:

Multiple vulnerabilities have been discovered in Google Chrome, which could result in arbitrary code execution. Google Chrome is a web browser used to access the Internet. These vulnerabilities can be exploited if a user visits, or is redirected to, a specially crafted web page. Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser, obtain sensitive information, bypass security restrictions, or cause denial-of-service conditions.

THREAT INTELLIGENCE:

There are currently no reports of these vulnerabilities being exploited in the wild.

SYSTEM AFFECTED:

  • Google Chrome prior to version 46.0.2490.71

  • Google V8 prior to version 4.6.85.23

 

RISK:

Government:

  • Large and medium government entities: High

  • Small government entities:High

Businesses:

  • Large and medium business entities: High

  • Small business entities: High

Home users: High

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Google Chrome. These vulnerabilities can be triggered by a user visiting a specially crafted web page. Details of these vulnerabilities are as follows:

  • A cross-origin policy bypass vulnerability that exists in Blink (CVE-2015-6755)

  • A use-after-free vulnerability that exists in PDFium (CVE-2015-6756)

  • A use-after-free vulnerability that exists in ServiceWorker (CVE-2015-6757)

  • A Bad-cast vulnerability that exists in PDFium (CVE-2015-6758)

  • An information disclosure vulnerability that exists in LocalStorage (CVE-2015-6759)

  • A vulnerability that exists due to improper error handling in libANGLE (CVE-2015-6760)

  • A memory corruption vulnerability that exists in FFMpeg (CVE-2015-6761)

  • A CORS bypass vulnerability that is executed via CSS fonts (CVE-2015-6762)

  • Multiple vulnerabilities that were revealed through internal audits, fuzzing and other initiatives (CVE-2015-6763)

Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code in the context of the browser, obtain sensitive information, bypass security restrictions, or cause denial-of-service conditions.

RECOMMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches 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.

REFERENCES:

Google:

http://googlechromereleases.blogspot.in/2015/10/stable-channel-update.html

CVE:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6755

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6756

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6757

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6758

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6759

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6760

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6761

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6762

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6763