git-vuln-finder/README.md

# 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

- Python 3.6
- GitPython
- langdetect

# Usage

~~~bash
usage: finder.py [-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

~~~bash
python3 finder.py -r /home/adulau/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

~~~json
  "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"
  }
~~~

# License and author(s)

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

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

# Acknowledgment

- Thanks to [Jean-Louis Huynen](https://github.com/gallypette) for the discussions about the crypto vulnerability pattern
- Thanks to [Sebastien Tricaud](https://github.com/stricaud) for the discussions regarding native language and commit messages

# References

- [Notes](https://gist.github.com/adulau/dce5a6ca5c65017869bb01dfee576303#file-finding-vuln-git-commit-messages-md)
- 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)