CVE-2019-9813

HIGH

Firefox < 66.0.1 - Memory Corruption

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-9813. PoCs published by Google Security Research.

AI-analyzed exploit summary The writeup details a type confusion vulnerability in SpiderMonkey's IonMonkey JIT compiler, where inconsistent type inference leads to crashes during property access. The bug arises from missing type barriers in JIT-compiled code when object prototypes are modified.

Description

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.

Exploits (1)

exploitdb WRITEUP VERIFIED

by Google Security Research · textdosmultiple

https://www.exploit-db.com/exploits/46646

View Code ZIP pw:eip

The writeup details a type confusion vulnerability in SpiderMonkey's IonMonkey JIT compiler, where inconsistent type inference leads to crashes during property access. The bug arises from missing type barriers in JIT-compiled code when object prototypes are modified.

Classification

Writeup 100%

Attack Type

Rce

Complexity

Complex

Reliability

Reliable

Target: Mozilla SpiderMonkey (Firefox JavaScript engine)

No auth needed

Prerequisites: A vulnerable version of SpiderMonkey with IonMonkey JIT enabled

MITRE ATT&CK