Microsoft Windows AppX Deployment Extensions Privilege Escalation Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-05-23
• Known to be used in ransomware campaigns

[ Description ]Official description

An elevation of privilege vulnerability exists when the Windows AppX Deployment Extensions improperly performs privilege management, resulting in access to system files.To exploit this vulnerability, an authenticated attacker would need to run a specially crafted application to elevate privileges.The security update addresses the vulnerability by correcting how AppX Deployment Extensions manages privileges., aka 'Windows AppX Deployment Extensions Elevation of Privilege Vulnerability'.

CISA: A privilege escalation vulnerability exists when the Windows AppX Deployment Extensions improperly performs privilege management, resulting in access to system files.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 13 Jun 2022): Apply updates per vendor instructions.

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

[ References ]References

• portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1385PatchVendor Advisory
• www.zerodayinitiative.com/advisories/ZDI-19-979Third Party Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource