Insufficient Validation in Linux Kernel TIPC Functionality
CVE-2021-43267

9.8CRITICAL

Key Information:

Vendor

Linux
Status
Linux Kernel
Vendor
CVE Published:
2 November 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 72%

What is CVE-2021-43267?

The Linux kernel's Transparent Inter-Process Communication (TIPC) functionality presents a security concern wherein remote attackers can exploit the system through insufficient validation of user-supplied sizes for the MSG_CRYPTO message type. This flaw could potentially allow unauthorized access and manipulation of sensitive data, highlighting the need for robust patching and system updates to mitigate such risks, especially in versions prior to 5.14.16.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-43267
Created by zzhacked

CVE-2021-43267
Created by YunchoHang

CVE-2021-43267-POC
Created by DarkSprings

References

https://github.com/torvalds/linux/commit/fa40d9734a57bcbf...
x_refsource_MISC
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5....
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA

EPSS Score

72% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2021-43267 : Insufficient Validation in Linux Kernel TIPC Functionality