Microsoft Office Elevation of Privilege Vulnerability (Microsoft Skype for Business Server 2019 CU2)
At a glance
- Source
- NVD
- EPSS
- EPSS 5.85 % · percentile 93 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Modified
Description
An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.
Weaknesses (CWE)
- CWE-20 — Improper Input Validation
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | HIGH 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2020-11921
- GCVE · GCVE-0-2020-1025
CERT-FR advisories
- CERTFR-2020-AVI-431 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
- CERTFR-2020-AVI-428 — Multiples vulnérabilités dans Microsoft Office · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:microsoft:lync:2013:*:*:*:*:*:*:*cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:*cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*cpe:2.3:a:microsoft:skype_for_business:2015:cumulative_update_8:*:*:*:*:*:*cpe:2.3:a:microsoft:skype_for_business:2019:cumulative_update_2:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Microsoft · Skype for Business Server 2019 CU2 | affected 7.0.0 < publication |
| Microsoft · Skype for Business Server 2015 CU 8 | affected 2015 CU 8 < publication |
| Microsoft · Microsoft Lync Server 2013 | affected 0 < publication |
| Microsoft · Microsoft SharePoint Enterprise Server 2016 | affected 16.0.0 < publication |
| Microsoft · Microsoft SharePoint Server 2019 | affected 16.0.0 < publication |
| Microsoft · Microsoft SharePoint Foundation 2013 Service Pack 1 | affected 15.0.0 < publication |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |