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 ReadableStream out of bounds read attempt

Rule Explanation

This rule is looking for a specific set of JavaScript functions that when used together can lead to an out of bounds read in vulnerable versions of Google Chrome. Attackers who leverage this vulnerability may be able to leak sensitive information, or in conjunction with another exploit to further compromise a user. Specifically, this vulnerability looks for an issue within the ReadableStream set of functionality that is supported by Google Chrome. Attackers who abuse JavaScript Promises in conjunction with a ReadableStream may be able to access memory they otherwise would not have access to.

What To Look For

This rule when an attacker attempts to exploit CVE-2020-6390.

Known Usage

Public information/Proof of Concept available

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic: Execution

Technique: User Execution

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org

Rule Vulnerability

Memory Corruption

Memory Corruption is any vulnerability that allows the modification of the content of memory locations in a way not intended by the developer. Memory corruption results are inconsistent; they could lead to fatal errors and system crashes or data leakage; some have no effect at all.

CVE Additional Information