PT-2022-10535 · Toaruos · Toaruos

Published 2022-06-08 · Updated 2023-08-08 · CVE-2021-36710

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions ToaruOS version 1.99.2

Description The issue is related to incorrect access control via the kernel, specifically due to improper MMU management and a low GDT address that allows it to be mapped in userland. This can be exploited by writing a call gate to escalate to CPL 0, which refers to the privilege level of the processor, in this case, the highest privilege level.

Recommendations For ToaruOS version 1.99.2, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Exposure of Resource to Wrong Sphere

Weakness Enumeration

CWE-668

Related Identifiers

CVE-2021-36710

Affected Products

Toaruos

References · 4

• 🔥 https://github.com/mehsauce/kowasuos/blob/master/exploits/kowasu-sysfunc-strikes-back.c · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-36710 · Security Note
• https://osv.dev/vulnerability/CVE-2021-36710 · Vendor Advisory
• https://t.me/cibsecurity/44037 · Telegram Post