git-vuln-finder

Finding potential software vulnerabilities from git commit messages. The output format is a JSON with the associated commit which could contain a fix regarding a software vulnerability. The search is based on a set of regular expressions against the commit messages only. If CVE IDs are present, those are added automatically in the output.

Requirements

• jq (sudo apt install jq)

Installation

Use it as a library

git-vuln-finder can be install with poetry. If you don't have poetry installed, you can do the following curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python.

$ poetry install
$ poetry shell
$ git-vuln-finder -h

You can also use pip. Then just import it:

Python 3.8.0 (default, Dec 11 2019, 21:43:13)
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from git_vuln_finder import find
>>> all_potential_vulnerabilities, all_cve_found, found = find("~/git/curl")

>>> [commit for commit, summary in all_potential_vulnerabilities.items() if summary['state'] == 'cve-assigned']
['9069838b30fb3b48af0123e39f664cea683254a5', 'facb0e4662415b5f28163e853dc6742ac5fafb3d',
... snap ...
 '8a75dbeb2305297640453029b7905ef51b87e8dd', '1dc43de0dccc2ea7da6dddb7b98f8d7dcf323914', '192c4f788d48f82c03e9cef40013f34370e90737', '2eb8dcf26cb37f09cffe26909a646e702dbcab66', 'fa1ae0abcde5df8d0b3283299e3f246bedf7692c', 'c11c30a8c8d727dcf5634fa0cc6ee0b4b77ddc3d', '75ca568fa1c19de4c5358fed246686de8467c238', 'a20daf90e358c1476a325ea665d533f7a27e3364', '042cc1f69ec0878f542667cb684378869f859911']

 >>> print(json.dumps(all_potential_vulnerabilities['9069838b30fb3b48af0123e39f664cea683254a5'], sort_keys=True, indent=4, separators=(",", ": ")))
 {
     "author": "Daniel Stenberg",
     "author-email": "daniel@haxx.se",
     "authored_date": 1567544372,
     "branches": [
         "master"
     ],
     "commit-id": "9069838b30fb3b48af0123e39f664cea683254a5",
     "committed_date": 1568009674,
     "cve": [
         "CVE-2019-5481",
         "CVE-2019-5481"
     ],
     "language": "en",
     "message": "security:read_data fix bad realloc()\n\n... that could end up a double-free\n\nCVE-2019-5481\nBug: https://curl.haxx.se/docs/CVE-2019-5481.html\n",
     "origin": "https://github.com/curl/curl.git",
     "origin-github-api": "https://api.github.com/repos///github.com/curl/curl/commits/9069838b30fb3b48af0123e39f664cea683254a5",
     "pattern-matches": [
         "double-free"
     ],
     "pattern-selected": "(?i)(double[-| ]free|buffer overflow|double free|race[-| ]condition)",
     "state": "cve-assigned",
     "stats": {
         "deletions": 4,
         "files": 1,
         "insertions": 2,
         "lines": 6
     },
     "summary": "security:read_data fix bad realloc()",
     "tags": []
 }

Use it as a command line tool

$ pipx install git-vuln-finder
$ git-vuln-finder --help

You can also use pip. pipx installs scripts (system wide available) provided by Python packages into separate virtualenvs to shield them from your system and each other.

Usage

usage: git-vuln-finder [-h] [-v] [-r R] [-o O] [-s S] [-p P] [-c] [-t]

Finding potential software vulnerabilities from git commit messages.

optional arguments:
  -h, --help  show this help message and exit
  -v          increase output verbosity
  -r R        git repository to analyse
  -o O        Output format: [json]
  -s S        State of the commit found
  -p P        Matching pattern to use: [vulnpatterns, cryptopatterns,
              cpatterns] - the pattern 'all' is used to match all the patterns
              at once.
  -c          output only a list of the CVE pattern found in commit messages
              (disable by default)
  -t          Include tags matching a specific commit

More info: https://github.com/cve-search/git-vuln-finder

Patterns

git-vuln-finder comes with 3 default patterns which can be selected to find the potential vulnerabilities described in the commit messages such as:

• vulnpatterns is a generic vulnerability pattern especially targeting web application and generic security commit message. Based on an academic paper.
• cryptopatterns is a vulnerability pattern for cryptographic errors mentioned in commit messages.
• cpatterns is a set of standard vulnerability patterns see for C/C++-like languages.

A sample partial output from Curl git repository

$ git-vuln-finder -r ~/git/curl | jq .
...
 "6df916d751e72fc9a1febc07bb59c4ddd886c043": {
    "message": "loadlibrary: Only load system DLLs from the system directory\n\nInspiration provided by: Daniel Stenberg and Ray Satiro\n\nBug: https://curl.haxx.se/docs/adv_20160530.html\n\nRef: Windows DLL hijacking with curl, CVE-2016-4802\n",
    "language": "en",
    "commit-id": "6df916d751e72fc9a1febc07bb59c4ddd886c043",
    "summary": "loadlibrary: Only load system DLLs from the system directory",
    "stats": {
      "insertions": 180,
      "deletions": 8,
      "lines": 188,
      "files": 7
    },
    "author": "Steve Holme",
    "author-email": "steve_holme@hotmail.com",
    "authored_date": 1464555460,
    "committed_date": 1464588867,
    "branches": [
      "master"
    ],
    "pattern-selected": "(?i)(denial of service |\bXXE\b|remote code execution|\bopen redirect|OSVDB|\bvuln|\bCVE\b |\bXSS\b|\bReDoS\b|\bNVD\b|malicious|x−frame−options|attack|cross site |exploit|malicious|directory traversal |\bRCE\b|\bdos\b|\bXSRF \b|\bXSS\b|clickjack|session.fixation|hijack|\badvisory|\binsecure |security |\bcross−origin\b|unauthori[z|s]ed |infinite loop)",
    "pattern-matches": [
      "hijack"
    ],
    "origin": "git@github.com:curl/curl.git",
    "origin-github-api": "https://api.github.com/repos/curl/curl/commits/6df916d751e72fc9a1febc07bb59c4ddd886c043",
    "tags": [],
    "cve": [
      "CVE-2016-4802"
    ],
    "state": "cve-assigned"
  },
  "c2b3f264cb5210f82bdc84a3b89250a611b68dd3": {
    "message": "CONNECT_ONLY: don't close connection on GSS 401/407 reponses\n\nPreviously, connections were closed immediately before the user had a\nchance to extract the socket when the proxy required Negotiate\nauthentication.\n\nThis regression was brought in with the security fix in commit\n79b9d5f1a42578f\n\nCloses #655\n",
    "language": "en",
    "commit-id": "c2b3f264cb5210f82bdc84a3b89250a611b68dd3",
    "summary": "CONNECT_ONLY: don't close connection on GSS 401/407 reponses",
    "stats": {
      "insertions": 4,
      "deletions": 2,
      "lines": 6,
      "files": 1
    },
    "author": "Marcel Raad",
    "author-email": "raad@teamviewer.com",
    "authored_date": 1455523116,
    "committed_date": 1461704516,
    "branches": [
      "master"
    ],
    "pattern-selected": "(?i)(denial of service |\bXXE\b|remote code execution|\bopen redirect|OSVDB|\bvuln|\bCVE\b |\bXSS\b|\bReDoS\b|\bNVD\b|malicious|x−frame−options|attack|cross site |exploit|malicious|directory traversal |\bRCE\b|\bdos\b|\bXSRF \b|\bXSS\b|clickjack|session.fixation|hijack|\badvisory|\binsecure |security |\bcross−origin\b|unauthori[z|s]ed |infinite loop)",
    "pattern-matches": [
      "security "
    ],
    "origin": "git@github.com:curl/curl.git",
    "origin-github-api": "https://api.github.com/repos/curl/curl/commits/c2b3f264cb5210f82bdc84a3b89250a611b68dd3",
    "tags": [],
    "state": "under-review"
  },
...

• Extracting CVE id(s) from git messages

  "98d132cf6a879faf0147aa83ea0c07ff326260ed": {
    "message": "Add a macro for testing assertion in both debug and production builds\n\nIf we have an assert then in a debug build we want an abort() to occur.\nIn a production build we wan
t the function to return an error.\n\nThis introduces a new macro to assist with that. The idea is to replace\nexisting use of OPENSSL_assert() with this new macro. The problem with\nOPENSSL
_assert() is that it aborts() on an assertion failure in both debug\nand production builds. It should never be a library's decision to abort a\nprocess (we don't get to decide when to kill t
he life support machine or\nthe nuclear reactor control system). Additionally if an attacker can\ncause a reachable assert to be hit then this can be a source of DoS attacks\ne.g. see CVE-20
17-3733, CVE-2015-0293, CVE-2011-4577 and CVE-2002-1568.\n\nReviewed-by: Tim Hudson <tjh@openssl.org>\n(Merged from https://github.com/openssl/openssl/pull/3496)",
    "commit-id": "98d132cf6a879faf0147aa83ea0c07ff326260ed",
    "summary": "Add a macro for testing assertion in both debug and production builds",
    "stats": {
      "insertions": 18,
      "deletions": 0,
      "lines": 18,
      "files": 1
    },
    "author": "Matt Caswell",
    "author-email": "matt@openssl.org",
    "authored_date": 1495182637,
    "committed_date": 1495457671,
    "branches": [
      "master"
    ],
    "pattern-selected": "(?i)(denial of service |\bXXE\b|remote code execution|\bopen redirect|OSVDB|\bvuln|\bCVE\b |\bXSS\b|\bReDoS\b|\bNVD\b|malicious|x−frame−options|attack|cross site |ex
ploit|malicious|directory traversal |\bRCE\b|\bdos\b|\bXSRF \b|\bXSS\b|clickjack|session.fixation|hijack|\badvisory|\binsecure |security |\bcross−origin\b|unauthori[z|s]ed |infinite loop)",
    "pattern-matches": [
      "attack"
    ],
    "cve": [
      "CVE-2017-3733",
      "CVE-2015-0293",
      "CVE-2011-4577",
      "CVE-2002-1568"
    ],
    "state": "cve-assigned"
  }

Running the tests

$ pytest

License and author(s)

This software is free software and licensed under the AGPL version 3.

Copyright (c) 2019-2020 Alexandre Dulaunoy - https://github.com/adulau/

Acknowledgment

• Thanks to Jean-Louis Huynen for the discussions about the crypto vulnerability patterns.
• Thanks to Sebastien Tricaud for the discussions regarding native language, commit messages and external patterns.
• Thanks to Cedric Bonhomme to make git-vuln-finder a Python library, add tests and improve the overall installation process.

Contributing

We welcome contributions for the software and especially additional vulnerability patterns. Every contributors will be added in the AUTHORS file and collectively own this open source software. The contributors acknowledge the Developer Certificate of Origin.

References

• Notes
• https://csce.ucmss.com/cr/books/2017/LFS/CSREA2017/ICA2077.pdf (mainly using CVE referenced in the commit message) - archive (http://archive.is/xep9o)
• https://asankhaya.github.io/pdf/automated-identification-of-security-issues-from-commit-messages-and-bug-reports.pdf (2 main regexps)