Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-03
• Known to be used in ransomware campaigns
• EPSS: 37% chance of exploitation in the next 30 days (higher than 99% of CVEs)

[ Description ]Official description

The Secondary Logon Service in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 does not properly process request handles, which allows local users to gain privileges via a crafted application, aka "Secondary Logon Elevation of Privilege Vulnerability."

CISA: A privilege escalation vulnerability exists in Microsoft Windows if the Windows Secondary Logon Service fails to properly manage request handles in memory. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 24 Mar 2022): Apply updates per vendor instructions.

• Patch on docs.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• www.securityfocus.com/bid/84034Broken LinkThird Party AdvisoryVDB Entry
• www.securitytracker.com/id/1035210Broken LinkThird Party AdvisoryVDB Entry
• docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-032PatchVendor Advisory
• www.exploit-db.com/exploits/39574ExploitThird Party AdvisoryVDB Entry
• www.exploit-db.com/exploits/39719ExploitThird Party AdvisoryVDB Entry
• www.exploit-db.com/exploits/39809ExploitThird Party AdvisoryVDB Entry
• www.exploit-db.com/exploits/40107ExploitThird Party AdvisoryVDB Entry
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource