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mobsfscan
mobsfscan is a static analysis tool that can find insecure code patterns in your Android and iOS source code. Supports Java, Kotlin, Android XML, Swift and Objective C Code. mobsfscan uses MobSF static analysis rules and is powered by semgrep and libsast pattern matcher.
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e-Learning Courses & Certifications
Automated Mobile Application Security Assessment with MobSF -MAS
Android Security Tools Expert -ATX
Installation
pip install mobsfscan
Requires Python 3.7+
Command Line Options
$ mobsfscan
usage: mobsfscan [-h] [--json] [--sarif] [--sonarqube] [--html] [--type {android,ios,auto}]
[-o OUTPUT] [-c CONFIG] [-mp {default,billiard,thread}] [-w] [--no-fail] [-v]
[path ...]
positional arguments:
path Path can be file(s) or directories with source code
options:
-h, --help show this help message and exit
--json set output format as JSON
--sarif set output format as SARIF 2.1.0
--sonarqube set output format compatible with SonarQube
--html set output format as HTML
--type {android,ios,auto}
optional: force android or ios rules explicitly
-o OUTPUT, --output OUTPUT
output filename to save the result
-c CONFIG, --config CONFIG
location to .mobsf config file
-mp {default,billiard,thread}, --multiprocessing {default,billiard,thread}
optional: specify multiprocessing strategy
-w, --exit-warning non zero exit code on warning
--no-fail force zero exit code, takes precedence over --exit-warning
-v, --version show mobsfscan version
Example Usage
$ mobsfscan tests/assets/src/
- Pattern Match ████████████████████████████████████████████████████████████ 3
- Semantic Grep ██████ 37
mobsfscan: v0.3.0 | Ajin Abraham | opensecurity.in
╒══════════════╤════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╕
│ RULE ID │ android_webview_ignore_ssl │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ DESCRIPTION │ Insecure WebView Implementation. WebView ignores SSL Certificate errors and accept any SSL Certificate. This application is vulnerable to MITM attacks │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ TYPE │ RegexAnd │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ PATTERN │ ['onReceivedSslError\\(WebView', '\\.proceed\\(\\);'] │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ SEVERITY │ ERROR │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ INPUTCASE │ exact │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ CVSS │ 7.4 │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ CWE │ CWE-295 Improper Certificate Validation │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ OWASP-MOBILE │ M3: Insecure Communication │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ MASVS │ MSTG-NETWORK-3 │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ REF │ https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05g-Testing-Network-Communication.md#webview-server-certificate-verification │
├──────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ FILES │ ╒════════════════╤═════════════════════════════════════════════════════════════════════════════════════════════╕ │
│ │ │ File │ ../test_files/android_src/app/src/main/java/opensecurity/webviewignoressl/MainActivity.java │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ Match Position │ 1480 - 1491 │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ Line Number(s) │ 50 │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ Match String │ .proceed(); │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ File │ ../test_files/android_src/app/src/main/java/opensecurity/webviewignoressl/MainActivity.java │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ Match Position │ 1331 - 1357 │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ Line Number(s) │ 46 │ │
│ │ ├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────┤ │
│ │ │ Match String │ onReceivedSslError(WebView │ │
│ │ ╘════════════════╧═════════════════════════════════════════════════════════════════════════════════════════════╛ │
╘══════════════╧════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╛
Python API
>>> from mobsfscan.mobsfscan import MobSFScan
>>> src = 'tests/assets/src/java/java_vuln.java'
>>> scanner = MobSFScan([src], json=True)
>>> scanner.scan()
{
'results': {
'android_logging': {
'files': [{
'file_path': 'tests/assets/src/java/java_vuln.java',
'match_position': (13, 73),
'match_lines': (19, 19),
'match_string': ' Log.d("htbridge", "getAllRecords(): " + records.toString());'
}],
'metadata': {
'cwe': 'CWE-532 Insertion of Sensitive Information into Log File',
'owasp-mobile': 'M1: Improper Platform Usage',
'masvs': 'MSTG-STORAGE-3',
'reference': 'https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05d-Testing-Data-Storage.md#logs',
'description': 'The App logs information. Please ensure that sensitive information is never logged.',
'severity': 'INFO'
}
},
'android_certificate_pinning': {
'metadata': {
'cwe': 'CWE-295 Improper Certificate Validation',
'owasp-mobile': 'M3: Insecure Communication',
'masvs': 'MSTG-NETWORK-4',
'reference': 'https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05g-Testing-Network-Communication.md#testing-custom-certificate-stores-and-certificate-pinning-mstg-network-4',
'description': 'This App does not use TLS/SSL certificate or public key pinning to detect or prevent MITM attacks in secure communication channel.',
'severity': 'INFO'
}
},
'android_root_detection': {
'metadata': {
'cwe': 'CWE-919 - Weaknesses in Mobile Applications',
'owasp-mobile': 'M8: Code Tampering',
'masvs': 'MSTG-RESILIENCE-1',
'reference': 'https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05j-Testing-Resiliency-Against-Reverse-Engineering.md#testing-root-detection-mstg-resilience-1',
'description': 'This App does not have root detection capabilities. Running a sensitive application on a rooted device questions the device integrity and affects users data.',
'severity': 'INFO'
}
},
'android_prevent_screenshot': {
'metadata': {
'cwe': 'CWE-200 Information Exposure',
'owasp-mobile': 'M2: Insecure Data Storage',
'masvs': 'MSTG-STORAGE-9',
'reference': 'https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05d-Testing-Data-Storage.md#finding-sensitive-information-in-auto-generated-screenshots-mstg-storage-9',
'description': 'This App does not have capabilities to prevent against Screenshots from Recent Task History/ Now On Tap etc.',
'severity': 'INFO'
}
},
'android_safetynet_api': {
'metadata': {
'cwe': 'CWE-353 Missing Support for Integrity Check',
'owasp-mobile': 'M8: Code Tampering',
'masvs': 'MSTG-RESILIENCE-1',
'reference': 'https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05j-Testing-Resiliency-Against-Reverse-Engineering.md#testing-root-detection-mstg-resilience-1',
'description': "This App does not uses SafetyNet Attestation API that provides cryptographically-signed attestation, assessing the device's integrity. This check helps to ensure that the servers are interacting with the genuine app running on a genuine Android device. ",
'severity': 'INFO'
}
},
'android_detect_tapjacking': {
'metadata': {
'cwe': 'CWE-200 Information Exposure',
'owasp-mobile': 'M1: Improper Platform Usage',
'masvs': 'MSTG-PLATFORM-9',
'reference': 'https://github.com/MobSF/owasp-mstg/blob/master/Document/0x05h-Testing-Platform-Interaction.md#testing-for-overlay-attacks-mstg-platform-9',
'description': "This app does not has capabilities to prevent tapjacking attacks. An attacker can hijack the user's taps and tricks him into performing some critical operations that he did not intend to.",
'severity': 'INFO'
}
}
},
'errors': []
}
Configure mobsfscan
A .mobsf file in the root of the source code directory allows you to configure mobsfscan. You can also use a custom .mobsf file using --config argument.
---
- ignore-filenames:
- skip.java
ignore-paths:
- __MACOSX
- skip_dir
ignore-rules:
- android_kotlin_logging
- android_safetynet_api
- android_prevent_screenshot
- android_detect_tapjacking
- android_certificate_pinning
- android_root_detection
- android_certificate_transparency
severity-filter:
- WARNING
- ERROR
Suppress Findings
You can suppress findings from source files by adding the comment // mobsf-ignore: rule_id1, rule_id2 to the line that trigger the findings.
Example:
String password = "strong password"; // mobsf-ignore: hardcoded_password
CI/CD Integrations
You can enable mobsfscan in your CI/CD or DevSecOps pipelines.
Github Action
Add the following to the file .github/workflows/mobsfscan.yml.
name: mobsfscan
on:
push:
branches: [ master, main ]
pull_request:
branches: [ master, main ]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4.2.2
- uses: actions/setup-python@v5.3.0
with:
python-version: '3.12'
- name: mobsfscan
uses: MobSF/mobsfscan@main
with:
args: '. --json'
Example: pivaa with mobsfscan github action
Github Code Scanning Integration
Add the following to the file .github/workflows/mobsfscan_sarif.yml.
name: mobsfscan sarif
on:
push:
branches: [ master, main ]
pull_request:
branches: [ master, main ]
jobs:
mobsfscan:
runs-on: ubuntu-latest
name: mobsfscan code scanning
steps:
- name: Checkout the code
uses: actions/checkout@v4.2.2
- uses: actions/setup-python@v5.3.0
with:
python-version: '3.12'
- name: mobsfscan
uses: MobSF/mobsfscan@main
with:
args: '. --sarif --output results.sarif || true'
- name: Upload mobsfscan report
uses: github/codeql-action/upload-sarif@v2
with:
sarif_file: results.sarif
Gitlab CI/CD
Add the following to the file .gitlab-ci.yml.
stages:
- test
mobsfscan:
image: python
before_script:
- pip3 install --upgrade mobsfscan
script:
- mobsfscan .
Example:
Travis CI
Add the following to the file .travis.yml.
language: python
install:
- pip3 install --upgrade mobsfscan
script:
- mobsfscan .
Circle CI
Add the following to the file .circleci/config.yaml
version: 2.1
jobs:
mobsfscan:
docker:
- image: cimg/python:3.9.6
steps:
- checkout
- run:
name: Install mobsfscan
command: pip install --upgrade mobsfscan
- run:
name: mobsfscan check
command: mobsfscan .
Docker
Prebuilt image from DockerHub
docker pull opensecurity/mobsfscan
docker run -v /path-to-source-dir:/src opensecurity/mobsfscan /src
Build Locally
docker build -t mobsfscan .
docker run -v /path-to-source-dir:/src mobsfscan /src