CVE-2023-23397: Microsoft Office Outlook Privilege Escalation Vulnerability
Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user.
| Vendor | Microsoft |
|---|---|
| Product | Office |
| Date added to KEV | 2023-03-14 |
| Due date (BOD 22-01) | 2023-04-04 |
| Known ransomware campaign use | Unknown |
| CWE | CWE-294 |
| Required action | Apply updates per vendor instructions. |
What to do
- Identify every instance of Microsoft Office in your environment (asset inventory, EDR, vulnerability scanner).
- Apply CISA's required action: Apply updates per vendor instructions.
- Federal civilian agencies must act by 2023-04-04 under BOD 22-01; other organizations can use the same date as a target.
- Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.
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Sources
- NVD entry for CVE-2023-23397 (severity scores, if any, live there)
- CISA KEV catalog entry
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-23397
- https://msrc.microsoft.com/blog/2023/03/microsoft-mitigates-outlook-elevation-of-privilege-vulnerability/
- https://nvd.nist.gov/vuln/detail/CVE-2023-23397