PT-2021-3372 · Microsoft · Windows

James Forshaw · Published 2021-03-30 · Updated 2023-08-01 · CVE-2021-31962

Positive Technologies (AI Summary)

CVSS v3.1

9.4

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Microsoft Windows (affected versions not specified)

Description The issue is related to errors in security settings in the implementation of the Kerberos network authentication protocol for the AppContainer isolated software environment in Microsoft Windows operating systems. Exploitation of this issue may allow a remote attacker to bypass Kerberos-based authentication using an arbitrary Service Principal Name (SPN), enabling password-less connection.

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

Weakness Enumeration

CWE-254

Related Identifiers

BDU:2021-03223

CVE-2021-31962

Affected Products

Windows

References · 12

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31962 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31962 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31962 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31962 · Vendor Advisory
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31962 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-03223 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31962 · Vendor Advisory
• https://cybersecurity-help.cz/vdb/SB2021060836 · Note
• https://securitylab.ru/vulnerability/521028.php · Note
• https://t.me/cvenotify/30855 · Telegram Post
• https://dirteam.com/sander/2021/06/09/kerberos-appcontainer-security-feature-bypass-vulnerability-cve-2021-31962-cvssv3-9-4-8-2 · Note
• http://packetstormsecurity.com/files/163206/Windows-Kerberos-AppContainer-Enterprise-Authentication-Capability-Bypass.html · Note