Vulnerability in Microsoft Active Directory Authentication Library
CVE-2019-1258
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.038 (90.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.038 · newest: 0.038 · change: 0.000
Affected products
- Microsoft Active Directory Authentication Library — versions 5.0.0, 5.0.1, 5.0.2
- Microsoft Adal.net — versions 5.0.0
- Microsoft Nuget — versions 5.2.0
- Microsoft Nuget 5.2.0 — versions 5.0.0
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1258 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2019-1258?
- CVE-2019-1258 is a high-severity vulnerability in Microsoft Active Directory Authentication Library. CVSS score: 8.8/10. Published 2019-08-14.
- How severe is CVE-2019-1258?
- High severity. CVSS v3 base score is 8.8 out of 10.