Detect CVE-2022-48503 Apple Multiple Products Unspecified Vulnerability Exploitation in Elastic Security
Detects potential exploitation of CVE-2022-48503, an unspecified vulnerability affecting Apple multiple products. This CVE is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. Detection focuses on suspicious process activity, network connections, and crash telemetry from Apple ecosystem processes that may indicate exploitation attempts.
MITRE ATT&CK
- Tactic
- Initial Access Execution Persistence
Elastic Detection Query
sequence by host.name with maxspan=5m
[process where event.type == "start"
and process.name : ("Safari", "com.apple.WebKit*", "WebKitWebProcess")
and not process.parent.name : ("launchd", "Finder", "Dock")]
[any where event.category : ("network", "process")
and (
(event.category == "network" and network.direction == "egress" and destination.port in (80, 443, 4444, 8080, 8443))
or
(event.category == "process" and process.name : ("bash", "zsh", "sh", "python*", "ruby", "perl"))
)
]Uses EQL sequence detection to correlate Apple WebKit process starts with subsequent suspicious network egress or shell interpreter spawning within a 5-minute window, indicating potential CVE-2022-48503 exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Browser automation tools triggering both WebKit processes and shell commands
- Development environments where Safari is tested alongside terminal workflows
- Security research environments performing controlled exploit testing
- Enterprise proxy configurations causing unusual network destination patterns
Other platforms for CVE-2022-48503
Testing Methodology
Validate this detection against 3 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 1Simulate Safari Child Shell Spawn (macOS)
Expected signal: Process launch event showing bash or osascript spawned in temporal proximity to Safari process activity; macOS Unified Log entries capturing both process starts
- Test 2WebKit Process Crash Simulation (macOS)
Expected signal: Crash report generated in ~/Library/Logs/DiagnosticReports/ for safaridriver; macOS Unified Log capturing SIGABRT receipt; endpoint EDR (CrowdStrike/Defender) process termination event with abnormal exit code
- Test 3Suspicious Outbound Connection from Safari Process (macOS)
Expected signal: Network connection event logged by endpoint EDR showing outbound TCP to port 4444 from curl process with Safari user-agent; DNS or network flow records capturing the connection attempt
Response Playbook
Triage
- Identify the affected Apple device(s) and confirm the OS version and product(s) involved; cross-reference against Apple security advisories HT213340–HT213346 to determine if the device is running a vulnerable version.
- Review endpoint telemetry for the flagged device within a 24-hour window around the alert: look for Safari/WebKit process crashes, unexpected child process spawning (shells, interpreters), and outbound network connections to non-standard or suspicious IPs.
- Check whether the device has received the relevant Apple security patches; query MDM (e.g., Jamf, Mosyle) for patch compliance status and last check-in time.
- Determine if the affected user account has accessed any suspicious URLs, received phishing emails, or installed third-party extensions around the time of the alert.
Containment
- Isolate the affected macOS device from the network via MDM remote lock or CrowdStrike network containment to prevent lateral movement or data exfiltration while investigation proceeds.
- Revoke active user sessions and force re-authentication for the affected user account, particularly for any cloud or SaaS services accessed from the device, to limit blast radius of potential credential theft.
Evidence Collection
- Collect a full macOS Unified Log capture (`log collect --output /tmp/system_logs.logarchive`) from the affected device covering the alert timeframe, preserving crash reports from `/Library/Logs/DiagnosticReports/` and `~/Library/Logs/DiagnosticReports/`.
- Export browser history, cookies, and cache from Safari (`~/Library/Safari/`) and capture a memory image if live forensics tooling (e.g., osquery, Velociraptor) is available, focusing on WebKit process memory.
Escalation Criteria
- !Escalate to incident response if lateral movement is detected from the affected device, if credentials are observed being exfiltrated, or if additional devices show similar Apple process anomalies within the same network segment.
- !Escalate immediately if the affected device has privileged access (admin, service account, developer keys) or if the compromise correlates with access to sensitive internal systems or data repositories.
Investigation Guide
Related Techniques
Forensic Artifacts
- >
macOS Unified Log entries (`/private/var/db/diagnostics/`) capturing process launch, crash, and network events for Safari/WebKit around the incident timeframe - >
Crash reports in `/Library/Logs/DiagnosticReports/` and `~/Library/Logs/DiagnosticReports/` for WebKit or Safari processes, which may contain stack traces revealing exploit behavior - >
Safari browsing history and cache at `~/Library/Safari/History.db` and `~/Library/Caches/com.apple.Safari/` to identify malicious URLs visited pre-exploitation - >
LaunchAgent and LaunchDaemon plist files in `~/Library/LaunchAgents/` and `/Library/LaunchDaemons/` for persistence mechanisms dropped post-exploitation
Tuning Guidance
Begin by baselining Apple product process parent-child relationships in your environment over 14 days to identify legitimate patterns (e.g., MDM solutions, dev tooling). Exclude known-good parent processes such as Xcode, Instruments, and MDM agents by their code-signed bundle IDs. If crash-based detection generates excessive noise, narrow to crash events followed within 60 seconds by network connections to external IPs. Adjust severity to critical if your fleet includes devices with access to sensitive systems or high-privilege accounts.
Hunting Queries
Threat hunt for Apple WebKit/Safari processes spawned by shell interpreters or scripting engines over the past 30 days — a low-frequency, high-fidelity signal for CVE-2022-48503 or similar browser exploitation across the fleet
DeviceProcessEvents
| where TimeGenerated >= ago(30d)
| where FileName in~ ('Safari', 'WebKitWebProcess', 'com.apple.WebKit')
| where InitiatingProcessFileName in~ ('bash', 'zsh', 'sh', 'python', 'python3', 'ruby', 'perl', 'curl', 'wget', 'osascript')
| summarize count(), make_set(ProcessCommandLine), make_set(DeviceName) by InitiatingProcessFileName, FileName, bin(TimeGenerated, 1h)
| order by count_ descindex=endpoint (sourcetype=crowdstrike:events OR sourcetype=jamf:events)
| eval apple_proc=if(match(process_name, "(?i)(safari|webkit|webkitwebprocess)"), 1, 0)
| eval shell_parent=if(match(parent_process_name, "(?i)(bash|zsh|sh|python|ruby|perl|osascript|curl|wget)"), 1, 0)
| where apple_proc=1 AND shell_parent=1
| stats dc(host) as unique_hosts, count as total_events by process_name, parent_process_name
| sort -unique_hostsAtomic Red Team Tests
Simulates the post-exploitation behavior of CVE-2022-48503 where an exploited Safari/WebKit process spawns a shell interpreter, generating the parent-child process relationship that detection rules target.
Command
open -a Safari --args 'about:blank' & sleep 2 && osascript -e 'do shell script "bash -c \"id > /tmp/cve_2022_48503_test.txt\""'Cleanup
rm -f /tmp/cve_2022_48503_test.txt; pkill -f 'Safari' 2>/dev/null || trueExpected Telemetry
Process launch event showing bash or osascript spawned in temporal proximity to Safari process activity; macOS Unified Log entries capturing both process starts
Expected Detection
Alert triggered by parent-child process relationship detection rules (Splunk, CrowdStrike CQL) correlating Safari/WebKit activity with shell interpreter invocation
Forces a WebKit process crash to generate the crash report artifacts and telemetry that detection rules monitoring for CVE-2022-48503 exploitation indicators would alert on.
Command
python3 -c "
import subprocess, os, signal, time
p = subprocess.Popen(['/usr/bin/safaridriver', '--port', '9999'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
time.sleep(2)
os.kill(p.pid, signal.SIGABRT)
print('Crash signal sent to safaridriver PID:', p.pid)
"Cleanup
pkill -f safaridriver 2>/dev/null || true; rm -f ~/Library/Logs/DiagnosticReports/safaridriver*.crash 2>/dev/null || trueExpected Telemetry
Crash report generated in ~/Library/Logs/DiagnosticReports/ for safaridriver; macOS Unified Log capturing SIGABRT receipt; endpoint EDR (CrowdStrike/Defender) process termination event with abnormal exit code
Expected Detection
Crash-based detection rules in Splunk and Elastic EQL should trigger on the abnormal WebKit process termination; Defender DeviceEvents ActionType=ProcessCrashed for Safari-family processes
Simulates network-based post-exploitation behavior by establishing an outbound connection from a process masquerading as or launched in context of Safari, targeting a non-standard port as a C2 beacon indicator.
Command
curl -s --connect-timeout 5 --max-time 5 -A 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15' http://127.0.0.1:4444/ 2>/dev/null; echo 'Connection attempt complete (expected to fail in lab)'Cleanup
echo 'No cleanup required — connection to localhost:4444 expected to fail'Expected Telemetry
Network connection event logged by endpoint EDR showing outbound TCP to port 4444 from curl process with Safari user-agent; DNS or network flow records capturing the connection attempt
Expected Detection
Network-based detection rules (KQL DeviceNetworkEvents, QRadar AQL on non-standard ports) should log the connection attempt; alert may require correlation with Apple process context to fire at high confidence