Rule Category

BROWSER-CHROME -- Snort has detected suspicious traffic known to exploit vulnerabilities present in the Chrome browser. These rules are separate from the "browser-webkit" category; while it uses the Webkit rendering engine, there's a lot of other features to create a secondary Chrome category.

Alert Message

BROWSER-CHROME Google Chrome Javascript V8 Array.indexOf information leak attempt

Rule Explanation

This event is generated when an attempt to exploit Google Chrome via CVE-2017-5040 is detected. Impact: Attempted User Privilege Gain Details: A vulnerability exists in Google Chrome Browser's Javascript V8 engine. It is possible to craft Javascript in such a way that when calling Array.indexOf, properties of the array can be changed, and certain values in memory can be disclosed to the user. Ease of Attack:

What To Look For

Known Usage

No public information

False Positives

No known false positives


Cisco Talos Intelligence Group

MITRE ATT&CK Framework



For reference, see the MITRE ATT&CK vulnerability types here:


Additional Links

Rule Vulnerability

CVE Additional Information

V8 in Google Chrome prior to 57.0.2987.98 for Mac, Windows, and Linux and 57.0.2987.108 for Android was missing a neutering check, which allowed a remote attacker to read values in memory via a crafted HTML page.
Severity Base Score4.3
Impact Score1.4 Exploit Score2.8
Confidentiality ImpactLOW Integrity ImpactNONE
Availability ImpactNONE Attack VectorNETWORK
Authentication Ease of AccessLOW
Privileges RequiredNONE