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Successful Application SSO from Rare Unknown Client Device

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Successful Application SSO from Rare Unknown Client Device

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Detects successful single sign-on (SSO) events to Okta applications from an unrecognized or "unknown" client device, as identified by the user-agent string. This activity may be indicative of exploitation of a vulnerability in Okta’s Classic Engine, which could allow an attacker to bypass application-specific sign-on policies, such as device or network restrictions. The vulnerability potentially enables unauthorized access to applications using only valid, stolen credentials, without requiring additional authentication factors.

Rule type: new_terms

Rule indices:

  • filebeat-*
  • logs-okta*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Domain: SaaS
  • Data Source: Okta
  • Use Case: Threat Detection
  • Use Case: Identity and Access Audit
  • Tactic: Initial Access

Version: 2

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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event.dataset: "okta.system"
    and event.action: "user.authentication.sso"
    and event.outcome: "success"
    and okta.client.device: ("Unknown" or "unknown")

Framework: MITRE ATT&CKTM

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