(Pwn2Own) Mozilla Firefox IonMonkey Optimizer Type Confusion Remote Code Execution Vulnerability

April 15th, 2019
ZDI-19-365 ZDI-CAN-8373

CVE ID

CVE-2019-9813

CVSS Score

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

Affected Vendors

Mozilla

Affected Products

Firefox

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Mozilla Firefox. 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 IonMonkey. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this vulnerability to execute code in the context of the current process.

Additional Details

Mozilla has issued an update to correct this vulnerability. More details can be found at:
https://www.mozilla.org/en-US/security/advisories/mfsa2019-09/#CVE-2019-9813

Disclosure Timeline

  • 2019-03-21 - Vulnerability reported to vendor
  • 2019-04-15 - Coordinated public release of advisory
  • 2019-06-14 - Advisory Updated

Credit

Niklas Baumstark (@_niklasb)

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