CVE-2023-48423
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Android devices without user interaction. The flaw exists in the DHCPv4 client implementation where missing bounds checking enables out-of-bounds writes. This affects Android devices running vulnerable versions of the DHCP client.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, and persistent backdoor installation.
Likely Case
Device compromise allowing attacker to gain elevated privileges, access sensitive data, and potentially pivot to other network resources.
If Mitigated
Attack prevented through proper network segmentation and device isolation, limiting impact to isolated network segments.
🎯 Exploit Status
Exploitation requires network access to send malicious DHCP responses. No user interaction needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: December 2023 Android security patch level
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2023-12-01
Restart Required: Yes
Instructions:
1. Apply December 2023 Android security patch. 2. Update affected devices through Settings > System > System update. 3. Reboot device after update completes.
🔧 Temporary Workarounds
Network segmentation
allIsolate vulnerable devices from untrusted networks and DHCP servers.
Use trusted DHCP servers only
allConfigure devices to use only authorized, trusted DHCP servers.
🧯 If You Can't Patch
- Segment affected devices into isolated network zones with strict access controls
- Implement network monitoring for DHCP traffic anomalies and unauthorized DHCP servers
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is earlier than December 2023, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows December 2023 or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- DHCP request/response anomalies
- Unexpected process crashes in DHCP client
- Suspicious network activity from DHCP client
Network Indicators:
- Malformed DHCP packets
- DHCP responses from unauthorized servers
- Unusual network traffic patterns from affected devices
SIEM Query:
source="android_logs" AND (process="dhcp4" OR process="dhcpclient") AND (event="crash" OR event="exception")