THREATPORT/VULNERABILITY/CVE-2019-1258
HIGH SEVERITY

CVE-2019-1258

Active Directory Authentication Library vulnerability

CVSS
8.8
EPSS
3.8%
EPSS pct
89th
Exploited
No known
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.
Affected vendor
Microsoft
Affected product
Active Directory Authentication Library
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2019-08-14

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2019-1258

  • Confirm whether Microsoft Active Directory Authentication Library is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-1258.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-1258

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-1258 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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