CVE-2019-9813

Mozilla Firefox IonMonkey Optimizer Type Confusion Remote Code Execution Vulnerability

Severity Score

8.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.

Un manejo incorrecto de __proto__ mutations puede llevar a confusión de tipo en el código IonMonkey JIT, y puede aprovecharse para la lectura y escritura de memoria arbitraria. Esta vulnerabilidad afecta a Firefox versiones anteriores a 66.0.1, Firefox ESR versiones anteriores a 60.6.1 y Thunderbird versiones anteriores a 60.6.1.

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.

A bug in IonMonkey leaves type inference information inconsistent, which in turn allows the compilation of JITed functions that cause type confusions between arbitrary objects.

*Credits: Niklas Baumstark (@_niklasb)

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-03-14 CVE Reserved
2019-03-25 CVE Published
2019-04-03 First Exploit
2024-06-12 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

CAPEC

References (8)

URL	Tag	Source

URL	Date	SRC
https://www.exploit-db.com/exploits/46646	2019-04-03

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:0966	2020-08-24
https://access.redhat.com/errata/RHSA-2019:1144	2020-08-24
https://www.mozilla.org/security/advisories/mfsa2019-09	2020-08-24
https://www.mozilla.org/security/advisories/mfsa2019-10	2020-08-24
https://www.mozilla.org/security/advisories/mfsa2019-12	2020-08-24
https://access.redhat.com/security/cve/CVE-2019-9813	2019-05-13
https://bugzilla.redhat.com/show_bug.cgi?id=1692182	2019-05-13

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Firefox Search vendor "Mozilla" for product "Firefox"				< 66.0.1 Search vendor "Mozilla" for product "Firefox" and version " < 66.0.1"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 60.6.1 Search vendor "Mozilla" for product "Firefox Esr" and version " < 60.6.1"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 60.6.1 Search vendor "Mozilla" for product "Thunderbird" and version " < 60.6.1"		-		Affected