(Pwn2Own) Google Chromium RegExpReplace Type Confusion Remote Code Execution Vulnerability

October 29th, 2019
ZDI-19-921 ZDI-CAN-8378

CVE ID

CVE-2019-13698

CVSS Score

8.8 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors

Google

Affected Products

Chromium

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Google Chromium. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the implementation of the JavaScript RegExp.replace method. By performing actions in JavaScript, an attacker can trigger a type confusion condition. An attacker can leverage this vulnerability to execute code in the context of the current process.

Additional Details

Google has issued an update to correct this vulnerability. More details can be found at:
https://chromereleases.googleblog.com/2019/04/stable-channel-update-for-desktop.html

Disclosure Timeline

  • 2019-10-29 - Vulnerability reported to vendor
  • 2019-10-29 - Coordinated public release of advisory

Credit

fluoroacetate (@fluoroacetate)

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