Detect Omnissa Workspace ONE UEM Server-Side Request Forgery (CVE-2021-22054) in Google Chronicle
Detects exploitation of CVE-2021-22054, a Server-Side Request Forgery (SSRF) vulnerability in Omnissa (formerly VMware) Workspace ONE UEM. An unauthenticated attacker can send crafted HTTP requests to the UEM server, causing it to make arbitrary outbound HTTP/HTTPS requests to internal or external resources. This can be leveraged to scan internal networks, access cloud metadata services (e.g., AWS IMDS), or pivot to internal services not directly reachable by the attacker. The vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
MITRE ATT&CK
YARA-L Detection Query
rule cve_2021_22054_workspace_one_ssrf {
meta:
author = "df00tech"
description = "Detects SSRF exploitation attempts against Omnissa Workspace ONE UEM (CVE-2021-22054)"
severity = "HIGH"
priority = "HIGH"
mitre_attack_tactic = "Reconnaissance, Discovery, Lateral Movement"
cve = "CVE-2021-22054"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2021-22054"
events:
$e.metadata.event_type = "NETWORK_HTTP"
(
re.regex($e.target.url, `(169\.254\.169\.254|metadata\.google\.internal|100\.100\.100\.200|127\.0\.0\.1|localhost|::1)`)
or re.regex($e.network.http.referral_url, `(169\.254\.169\.254|metadata\.google\.internal|127\.0\.0\.1|localhost)`)
)
re.regex($e.target.url, `(/DeviceManagement/|/AirWatch/|/API/mdm/|/mGroups/)`)
condition:
$e
}Chronicle YARA-L rule detecting HTTP network events where Workspace ONE UEM paths are accessed with URL parameters or referrer values pointing to cloud metadata services or loopback addresses, indicating SSRF exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate UEM callback URLs that inadvertently match metadata IP patterns in test environments
- Authorized internal security scans targeting the UEM server
- Network monitoring agents that generate SSRF-like patterns during health polling
- Misconfigured DNS resolution causing internal hostnames to resolve to loopback
Other platforms for CVE-2021-22054
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1SSRF via Workspace ONE UEM Unauthenticated Endpoint to IMDS
Expected signal: IIS access log entry for /DeviceManagement/enrollment with url= parameter containing 169.254.169.254; outbound network connection from UEM server to 169.254.169.254:80
- Test 2SSRF Internal Network Port Scan via Workspace ONE UEM
Expected signal: Multiple IIS log entries within seconds for /AirWatch/ paths with url= parameters containing RFC1918 addresses on varying ports; timing differences in responses reveal open vs closed ports
- Test 3SSRF to Internal Administrative Interface via Redirect Parameter
Expected signal: IIS log entry with redirect= parameter pointing to internal host; potential Windows Defender firewall log showing outbound connection from UEM process to internal admin host; Sysmon Event ID 3 network connection from IIS worker process (w3wp.exe) to internal IP
- Test 4SSRF File URI Scheme Attempt for Local File Read
Expected signal: IIS log entry with file:// URI in URL parameter; absence of outbound network connection (file read is local); potential application error log entries if file:// is rejected by URL validation
Unlock Pro Content
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