CVE-2023-21674KEV · OVERDUECWE-416

Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

High · published January 10, 2023

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 98.7th percentile for exploit probability.

1362
days past CISA
deadline
CVSS v3.1
8.8
EPSS
41%
Percentile
98.7
In the wild
Confirmed
What it is

🚨 A quick trick can elevate privileges in Windows ALPC, giving attackers the keys to the kingdom! ⚡ Think of it like a hotel where a visitor discovers an unlocked staff door—suddenly, they're free to roam areas they shouldn't, accessing exclusive services without any authentication check! An attacker could leverage this vulnerability to gain higher privileges on the system, allowing them to execute arbitrary code or access sensitive data. This could lead to a complete takeover of the affected system, putting your entire network at risk!

Put simply

Think of it like a hotel where a visitor discovers an unlocked staff door—suddenly, they're free to roam areas they shouldn't, accessing exclusive services without any authentication check! This vulnerability allows attackers to exploit the Advanced Local Procedure Call (ALPC) feature in Windows, facilitating privilege escalation by bypassing security measures that should prevent unauthorized access.

What to do

An attacker could leverage this vulnerability to gain higher privileges on the system, allowing them to execute arbitrary code or access sensitive data. This could lead to a complete takeover of the affected system, putting your entire network at risk! To protect your systems, immediately apply the latest security patch released for this vulnerability. Regularly review user permissions and monitor for unusual activity in your network as an extra precaution. Don't forget to update your security policies to reflect the latest best practices! You can tackle this head-on! By following these steps, you’ll strengthen your defenses in no time! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.40987 · 98.7th percentile
Weakness
CWE-416 · Use After Free
Published
2023-01-10T00:00Z
KEV added
2023-01-10 · due 2023-01-31
EPSS history
Timeline
  • 10 JAN 00:00Z
    Added to CISA KEV — remediate by Jan 31
    kev
  • 10 JAN 00:00Z
    Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
    cvelistv5