Microsoft Task Scheduler Privilege Escalation Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-15
• Known to be used in ransomware campaigns

[ Description ]Official description

An elevation of privilege vulnerability exists in the way the Task Scheduler Service validates certain file operations. An attacker who successfully exploited the vulnerability could gain elevated privileges on a victim system. To exploit the vulnerability, an attacker would require unprivileged code execution on a victim system. The security update addresses the vulnerability by correctly validating file operations.

CISA: A privilege escalation vulnerability exists in the way the Task Scheduler Service validates certain file operations.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 5 Apr 2022): Apply updates per vendor instructions.

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

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1069PatchVendor Advisory
• blog.0patch.com/2019/06/another-task-scheduler-0day-another.htmlExploitThird Party Advisory
• portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1069PatchVendor Advisory
• www.kb.cert.org/vuls/id/119704Third Party AdvisoryUS Government Resource
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource