Detect CVE-2021-30952: Apple Multiple Products Integer Overflow Exploitation in CrowdStrike LogScale
Detects exploitation attempts of CVE-2021-30952, an integer overflow vulnerability in Apple Multiple Products. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. Integer overflow conditions in Apple platform components can lead to memory corruption, arbitrary code execution, or privilege escalation.
MITRE ATT&CK
LogScale Detection Query
event_simpleName IN (ProcessRollup2, SyntheticProcessRollup2)
| filter (FileName = "com.apple.WebKit.WebContent" OR FileName = "WebContent" OR FileName = "Safari" OR FileName = "MobileSafari")
| filter NOT (ImageFileName = "/Applications/*" OR ImageFileName = "/System/*" OR ImageFileName = "/usr/bin/*")
| filter ParentBaseFileName NOT IN ("launchd", "softwareupdated", "mdmclient", "installd")
| eval RiskLevel = case(
ParentBaseFileName IN ("sh", "bash", "zsh", "python3", "python"), "HIGH",
match(ImageFileName, "(?i)(tmp|var/folders|Library/Caches)"), "HIGH",
true, "MEDIUM"
)
| stats count() as ProcessCount, values(CommandLine) as CommandLines by DeviceName, UserName, FileName, ImageFileName, ParentBaseFileName, RiskLevel
| sort -ProcessCountCrowdStrike Falcon CQL detecting WebKit process anomalies on macOS endpoints that may indicate CVE-2021-30952 exploitation, using process lineage and execution path analysis.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate macOS software updates temporarily executing WebKit processes from update staging directories
- Enterprise app deployment tools extracting and running WebKit-embedded applications
- Automated UI testing frameworks using Safari WebDriver from non-standard locations
Other platforms for CVE-2021-30952
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 WebKit Process Spawning Shell from Non-Standard Path
Expected signal: Process creation event showing /tmp/webkit-sim/WebContent spawning with process name matching WebContent but executing from /tmp path
- Test 2Create Persistence via LaunchAgent After Simulated WebKit Compromise
Expected signal: File creation event for plist in ~/Library/LaunchAgents/ followed by launchctl process execution loading the new agent
- Test 3Simulate Integer Overflow Memory Pressure via Safari Crash Report Generation
Expected signal: File creation event for .crash file in /tmp with WebContent prefix; potential file integrity monitoring alert
Unlock Pro Content
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