SB2021011280 - Privilege escalation in Microsoft SQL Server
Published: January 12, 2021
Security Bulletin ID
SB2021011280
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2021-1636)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to insufficient validation of user-supplied input, when the affected SQL Server is configured to run an Extended Event session. A remote user can send specially crafted data to the server and execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.