Possible VMware Workspace ONE SSRF via instanceHealth hostName At-Injection (via webserver)

ATT&CK techniques

Initial Access → Cred Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1528Steal Application Access Token
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects requests to the SAAS REST instanceHealth endpoint whose hostName or path parameters contain an at-sign injection redirecting the server-side request to an attacker host. This is the post-auth SSRF CVE-2021-22056 used to leak administrative JWT Authorization tokens from internal cluster instances. Detecting it surfaces token theft and internal request forgery against the vulnerable appliance.

Reporting behind it

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Possible VMware Workspace ONE SSRF via instanceHealth hostName At-Injection (via webserver)

Pivot detection · T1190 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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