Detect Apple Multiple Products Buffer Overflow Exploitation (CVE-2026-20700) in Sumo Logic CSE
Detects exploitation attempts and post-exploitation activity related to CVE-2026-20700, a buffer overflow vulnerability (CWE-119) affecting multiple Apple products. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. Buffer overflow exploitation against Apple platforms may result in arbitrary code execution, privilege escalation, or sandbox escape.
MITRE ATT&CK
Sumo Detection Query
_sourceCategory=endpoint/apple OR _sourceCategory=crowdstrike OR _sourceCategory=sentinelone
| where %"os.type" in ("macos", "ios", "ipados") or %"vendor" = "Apple"
| where (%"parent_process" matches "*Safari*" or %"parent_process" matches "*WebKit*" or %"parent_process" matches "*MobileSafari*")
and (%"process_name" in ("sh","bash","zsh","python","python3","osascript","launchctl","curl","nc"))
or %"event_type" in ("exploit_detected","buffer_overflow","heap_corruption")
| fields _messageTime, %"host", %"user", %"parent_process", %"process_name", %"cmdline", %"dest_ip", %"event_type"
| eval cve = "CVE-2026-20700"
| count by %"host", %"user", %"parent_process", %"process_name"
| where _count > 0
| sort by _messageTime descSumo Logic query for CVE-2026-20700 detection targeting Apple platform endpoint logs, looking for suspicious child processes spawned from browser components and direct exploit detection events.
Data Sources
Required Tables
False Positives & Tuning
- Automated UI testing frameworks (e.g., Selenium with Safari WebDriver) spawning shell utilities
- Corporate endpoint management agents that use browser-based UI and spawn system processes
- Legitimate Electron apps built on WebKit that spawn child processes for functionality
- Developer environments with browser-based IDEs that invoke terminal commands
Other platforms for CVE-2026-20700
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 1Simulate WebKit Child Process Spawn (macOS)
Expected signal: EDR should log process creation event with parent process name matching 'com.apple.WebKit.WebContent' spawning 'bash' with shell commands. Network telemetry should show no external connections in this baseline test.
- Test 2Simulate Post-Exploitation Persistence via LaunchAgent (macOS)
Expected signal: File creation event in ~/Library/LaunchAgents/ with a plist filename mimicking Apple system components. EDR should log the file write and potentially the LaunchAgent registration.
- Test 3Simulate Exploit Attempt Network Callback (macOS)
Expected signal: Network connection attempt from curl process with unusual User-Agent string. In production scenario, this would be replaced with the WebKit process making the network connection directly.
- Test 4Heap Spray Pattern Simulation via Python (macOS/Linux)
Expected signal: Python process allocating large contiguous memory blocks in rapid succession. Memory allocation anomaly detection in EDR should generate telemetry showing large heap allocations.
Unlock Pro Content
Get the full detection package for CVE-2026-20700 including response playbook, investigation guide, and atomic red team tests.