feat(python): add sensitive data in cookie rule for Python http lib (…

…CWE-315)

rules/python/lang/cookies.yml

@@ -0,0 +1,45 @@
+imports:
+  - python_shared_lang_datatype
+patterns:
+  - pattern: $<COOKIE_INIT>[$<_>] = $<DATA_TYPE>
+    filters:
+      - variable: COOKIE_INIT
+        detection: python_lang_cookies_init
+        scope: cursor
+      - variable: DATA_TYPE
+        detection: python_shared_lang_datatype
+        scope: result
+auxiliary:
+  - id: python_lang_cookies_init
+    patterns:
+      - pattern: $<COOKIE>()
+        filters:
+          - variable: COOKIE
+            regex: \A(http\.)?(cookies\.)?(Simple|Base)Cookie\z
+languages:
+  - python
+severity: high
+metadata:
+  description: Leakage of sensitive data in cookie
+  remediation_message: |-
+    ## Description
+
+    Storing sensitive data in cookies can lead to a data breach. This vulnerability occurs when sensitive information is stored in browser cookies, putting it at risk of unauthorized access.
+
+    ## Remediations
+
+    - **Do not** store sensitive data in unencrypted cookies. This practice can expose sensitive information to potential security threats.
+      ```python
+      HttpResponse.set_cookie("user", "[email protected]", ...) # unsafe
+      ```
+    - **Do** use encrypted cookies to protect sensitive data stored in cookies.
+      ```python
+      HttpResponse.set_signed_cookie("user", "[email protected]", ...)
+      ```
+
+    ## References
+    
+  cwe_id:
+    - 315
+  id: python_lang_cookies
+  documentation_url: https://docs.bearer.com/reference/rules/python_lang_cookies

tests/python/lang/cookies/test.js

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+const {
+  createNewInvoker,
+  getEnvironment,
+} = require("../../../helper.js")
+const { ruleId, ruleFile, testBase } = getEnvironment(__dirname)
+
+describe(ruleId, () => {
+  const invoke = createNewInvoker(ruleId, ruleFile, testBase)
+
+  test("cookies", () => {
+    const testCase = "main.py"
+
+    const results = invoke(testCase)
+
+    expect(results).toEqual({
+      Missing: [],
+      Extra: []
+    })
+  })
+})

tests/python/lang/cookies/testdata/main.py

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+from http import cookies
+
+def bad(user):
+  myCookie = cookies.SimpleCookie()
+  # bearer:expected python_lang_cookies
+  myCookie["user"] = user.email
+
+def bad2(customer):
+  myBasicCookie = http.cookies.BaseCookie()
+  # bearer:expected python_lang_cookies
+  myBasicCookie["logged customer"] = customer.email
+
+def ok(user):
+  safeCookie = cookies.SimpleCookie()
+  safeCookie["user"] = "current"
+