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How the CVE Works
CVE-2025-31218 is an information disclosure vulnerability in macOS Sequoia (versions before 15.5). The flaw allows malicious applications to observe hostnames of new network connections due to improper handling of network request logging. Attackers can exploit this by monitoring DNS queries or network socket activity, potentially leaking sensitive domain information. The vulnerability stems from insufficient sandbox restrictions, allowing apps to access network metadata. Apple resolved this by removing the vulnerable logging mechanism in macOS Sequoia 15.5.
DailyCVE Form
Platform: macOS
Version: <15.5
Vulnerability: Info Disclosure
Severity: Medium
Date: 05/27/2025
Prediction: Patch expected by 06/10/2025
What Undercode Say:
Analytics:
- Exploit likelihood: Moderate (requires local app execution)
- Data exposure: Partial (hostnames only)
- Attack vector: Local (malicious app)
Exploit Commands:
Monitor active network connections (proof-of-concept) lsof -i -n | grep ESTABLISHED DNS query interception (requires elevated privileges) sudo tcpdump -i en0 -n port 53
Mitigation Code:
// Sandbox enment to restrict network access (macOS) <key>com.apple.security.network.client</key> <false/>
Patch Verification:
Check macOS version post-update sw_vers -productVersion
Detection Rule (YARA):
rule macos_hostname_leak {
meta:
description = "Detects apps querying network hostnames"
strings:
$api_call = "getaddrinfo"
condition:
$api_call
}
Network Hardening:
Disable unnecessary network services sudo launchctl unload -w /System/Library/LaunchDaemons/.plist
Log Monitoring:
Audit network connections via syslog log stream --predicate 'eventMessage contains "network"'
Apple-Signed Patch Note:
<patchnote> <version>15.5</version> <fix>CVE-2025-31218</fix> </patchnote>
End of Report.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
