In short
- CVE-2019-1258 is a HIGH (CVSS 8.8) vulnerability affecting microsoft.identitymodel.clients.activedirectory, active directory authentication library (microsoft), nuget (microsoft).
- Chance of exploitation in the next 30 days (EPSS): 3.8%, higher than 90.0% of all vulnerabilities.
- Fix: update to 5.2.0 or later.
Description
An elevation of privilege vulnerability exists in Azure Active Directory Authentication Library On-Behalf-Of flow, in the way the library caches tokens, aka 'Azure Active Directory Authentication Library Elevation of Privilege Vulnerability'.
NVD description
An elevation of privilege vulnerability exists in Azure Active Directory Authentication Library On-Behalf-Of flow, in the way the library caches tokens. This vulnerability allows an authenticated attacker to perform actions in context of another user.
The authenticated attacker can exploit this vulneraiblity by accessing a service configured for On-Behalf-Of flow that assigns incorrect tokens.
This security update addresses the vulnerability by removing fallback cache look-up for On-Behalf-Of scenarios.
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