PT-2023-1046 · Microsoft · Windows

Yuki Chen · Published 2023-01-10 · Updated 2024-05-29 · CVE-2023-21556

Positive Technologies · (AI Summary)

CVSS v3.1

8.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions:

Windows versions prior to the fixed version

Description:

The issue is related to the implementation of the Layer 2 Tunneling Protocol (L2TP) in Microsoft Windows, specifically involving the use of memory after it has been freed. This can be exploited by a remote attacker who sends a specially crafted connection request to a RAS server, potentially allowing the execution of arbitrary code.

Recommendations:

For Windows versions prior to the fixed version, apply the necessary patch or update to resolve the issue.

At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Integer Underflow

Use After Free

Weakness Enumeration

CWE-191

CWE-416

Related Identifiers

BDU:2023-00140

CVE-2023-21556

Affected Products

Windows

References · 13

• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-21556 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-00140 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-21556 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/688799 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2023-21556 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21556 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-21556 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/688435 · Security Note
• https://t.me/cvenotify/42247 · Telegram Post
• https://t.me/cvenotify/41760 · Telegram Post
• https://t.me/cvenotify/41761 · Telegram Post
• https://t.me/cibsecurity/56308 · Telegram Post
• https://t.me/cibsecurity/56292 · Telegram Post