Detect Apple Multiple Products Use-After-Free Vulnerability (CVE-2023-43000) in Google Chronicle
Detects exploitation of CVE-2023-43000, a use-after-free vulnerability (CWE-416) affecting multiple Apple products. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. Use-after-free conditions in Apple system components can allow attackers to execute arbitrary code, escalate privileges, or achieve kernel-level compromise on affected macOS, iOS, and related platforms.
MITRE ATT&CK
- Tactic
- Privilege Escalation Execution
YARA-L Detection Query
rule cve_2023_43000_apple_uaf_exploit {
meta:
author = "df00tech Detection Engineering"
description = "Detects potential CVE-2023-43000 Apple use-after-free exploitation via crash reporter activity and suspicious network connections"
severity = "HIGH"
priority = "HIGH"
reference = "https://nvd.nist.gov/vuln/detail/CVE-2023-43000"
yara_version = "YL2.0"
rule_version = "1.0"
events:
$crash.metadata.event_type = "PROCESS_LAUNCH"
$crash.principal.hostname = $host
$crash.target.process.file.full_path = /(?i)(ReportCrash|CrashReporter|osanalyticshelper|sysdiagnose)/
$crash.principal.platform = "MAC"
$net.metadata.event_type = "NETWORK_CONNECTION"
$net.principal.hostname = $host
$net.network.direction = "OUTBOUND"
$net.network.application_protocol != "DNS"
not $net.target.ip = /^(10\.|172\.(1[6-9]|2[0-9]|3[01])\.|192\.168\.)/
$net.target.port in (4444, 1337, 8080, 8443, 9001)
match:
$host over 10m
condition:
$crash and $net
}Chronicle YARA-L rule detecting correlation between Apple crash reporter process activity and suspicious outbound network connections on macOS endpoints, indicating potential CVE-2023-43000 use-after-free exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate Apple diagnostic submissions from CrashReporter to Apple servers after normal app crashes
- macOS system integrity verification processes that spawn crash-adjacent processes
- Enterprise monitoring agents that intercept crashes and forward to internal SOC infrastructure
- Developer debugging sessions using crash handlers with network-enabled debugging backends
Other platforms for CVE-2023-43000
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 macOS Use-After-Free Crash with C2-like Network Beacon
Expected signal: Process crash event for python3, EXC_BAD_ACCESS in crash logs, outbound TCP connection to LAB_C2_HOST:4444 from the same host within 10 seconds of crash
- Test 2Invoke CrashReporter from Non-Standard Parent Process
Expected signal: ProcessRollup2 event for ReportCrash with parent_process=bash; crash report file creation in DiagnosticReports directory
- Test 3Mass Crash Generation and External Reachback Simulation
Expected signal: 5 crash report files created in DiagnosticReports, 5 outbound HTTP connections to LAB_C2_HOST:4444 over ~5 seconds
Unlock Pro Content
Get the full detection package for CVE-2023-43000 including response playbook, investigation guide, and atomic red team tests.