CVE intelligence and bounded remediation
CVE-2019-1258 — Microsoft Active Directory Authentication Library security vulnerability
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.
- Severity
- High
- CVSS
- 8.8 (3.0)
- Published
- 2019-08-14
- CISA KEV
- Not currently listed
- Ecosystem
- windows/system
Affected products
- microsoft / active_directory_authentication_library
- microsoft / active_directory_authentication_library / 5.0.0
- microsoft / active_directory_authentication_library / 5.0.1
- microsoft / active_directory_authentication_library / 5.0.2
- microsoft / active_directory_authentication_library / 5.0.3
- microsoft / nuget / 5.2.0
Matched remediation archetype
Privilege escalation and unsafe privilege management
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Map service accounts, operating-system identities, roles, capabilities, impersonation, set-user transitions, and administrative helper paths.
- Determine whether untrusted users or lower-privilege processes can reach the affected transition or modify inputs it trusts.
- Review file, socket, registry, device, job, container, and cloud-role permissions used before and after privilege changes.
Remediate safely
- Apply the supported fix and redesign privileged operations as a minimal, authenticated, allowlisted interface.
- Drop privileges before processing untrusted input, verify the drop succeeds, and remove unnecessary roles, capabilities, and write permissions.
- Validate ownership and permissions at time of use and add explicit lower-to-higher privilege boundary tests.
Authoritative sources
Complete CVE record and remediation plan
The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.