CVE-2021-23543

Sandbox Bypass

Critical · published January 7, 2022

CVSS v3.1
9.8
EPSS
2%
Percentile
77.9
In the wild
Unconfirmed
What it is

🔥 A sneaky Prototype Pollution vulnerability in realms-shim lets attackers bypass sandbox protections—great news if you’re looking for trouble! 🚨 Imagine a party where the bouncer lets anyone in because they don’t check IDs properly—once inside, anyone could cause chaos. This vulnerability acts like that bouncer, allowing an attacker to manipulate the prototype chain in a way that can lead to unauthorized access or actions. An attacker could exploit this vulnerability to manipulate object prototypes, potentially leading to unauthorized access, data corruption, or even a complete compromise of the application. With a CVSS score of 9.8, the stakes are incredibly high—this is like leaving your front door wide open while hosting a massive event!

Put simply

Imagine a party where the bouncer lets anyone in because they don’t check IDs properly—once inside, anyone could cause chaos. This vulnerability acts like that bouncer, allowing an attacker to manipulate the prototype chain in a way that can lead to unauthorized access or actions. This flaw allows attackers to inject properties into the global object through Prototype Pollution, effectively bypassing sandbox restrictions and compromising the integrity of the application.

What to do

An attacker could exploit this vulnerability to manipulate object prototypes, potentially leading to unauthorized access, data corruption, or even a complete compromise of the application. With a CVSS score of 9.8, the stakes are incredibly high—this is like leaving your front door wide open while hosting a massive event! Patch realms-shim to the latest version immediately to close this critical security hole. Review your code to ensure proper input validation and consider implementing additional security measures like strict object freezing. This is fixable! Stay vigilant, follow these steps, and you’ll keep your application safe and sound! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P
CVSS v4.0
Not supplied
EPSS
0.01762 · 77.9th percentile
Published
2022-01-07T20:05Z
EPSS history
Timeline
  • 07 JAN 20:05Z
    Sandbox Bypass
    cvelistv5