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CVE-2020-1025

CRITICALCVSS 9.8/10EPSS 5.85%

Last modified

CVE-2020-1025 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 5.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
5.85%

92.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
MicrosoftLync2013—
MicrosoftSharepoint Enterprise Server2016—
MicrosoftSharepoint Foundation2013Sp1
MicrosoftSharepoint Server2019—
MicrosoftSkype For Business2015Cumulative Update 8
MicrosoftSkype For Business2019Cumulative Update 2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-1025?
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.
How severe is CVE-2020-1025?
CVE-2020-1025 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.85% probability of exploitation in the next 30 days.
How do I fix CVE-2020-1025?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1025?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST