go.lang.security.audit.net.cookie-missing-httponly.cookie-missing-httponly

profile photo of returntocorpreturntocorp
Author
5,552
Download Count*
LGPL Commons Clause
License

A session cookie was detected without setting the 'HttpOnly' flag. The 'HttpOnly' flag for cookies instructs the browser to forbid client-side scripts from reading the cookie which mitigates XSS attacks. Set the 'HttpOnly' flag by setting 'HttpOnly' to 'true' in the Cookie.

Run Locally

Run in CI

Semgrep CI docs

Defintion

Edit RuleView Source
Open in Playground 
rules:
  - id: cookie-missing-httponly
    patterns:
      - pattern-not-inside: |
          http.Cookie{
            ...,
            HttpOnly: true,
            ...,
          }
      - pattern: |
          http.Cookie{
            ...,
          }
    message: A session cookie was detected without setting the 'HttpOnly' flag. The
      'HttpOnly' flag for cookies instructs the browser to forbid client-side
      scripts from reading the cookie which mitigates XSS attacks. Set the
      'HttpOnly' flag by setting 'HttpOnly' to 'true' in the Cookie.
    metadata:
      cwe:
        - "CWE-1004: Sensitive Cookie Without 'HttpOnly' Flag"
      owasp:
        - A05:2021 - Security Misconfiguration
      references:
        - https://github.com/0c34/govwa/blob/139693e56406b5684d2a6ae22c0af90717e149b8/util/cookie.go
        - https://golang.org/src/net/http/cookie.go
      category: security
      technology:
        - go
      confidence: MEDIUM
      subcategory:
        - vuln
      likelihood: LOW
      impact: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
    fix-regex:
      regex: (HttpOnly\s*:\s+)false
      replacement: \1true
    severity: WARNING
    languages:
      - go

Examples

cookie-missing-httponly.go

// cf. https://github.com/0c34/govwa/blob/139693e56406b5684d2a6ae22c0af90717e149b8/util/cookie.go

package util

import (
	"net/http"
	"time"
)

func SetCookieLevel(w http.ResponseWriter, r *http.Request, cookievalue string){

	level := cookievalue
	if level == "" {
		level = "low"
	}
	SetCookie(w,"Level",level)

}

func CheckLevel(r *http.Request) bool {
	level := GetCookie(r, "Level")
	if level == "" || level == "low" {
		return false //set default level to low
	} else if level == "high" {
		return true //level == high
	} else {
		return false // level == low
	}
}

/* cookie setter getter */

func SetCookie(w http.ResponseWriter, name, value string){
    // ruleid: cookie-missing-httponly
	cookie := http.Cookie{
		Name: name,
		Value: value,
	}
	http.SetCookie(w, &cookie)
}

func SetSecureCookie(w http.ResponseWriter, name, value string){
    // ok: cookie-missing-httponly
	cookie := http.Cookie{
        Secure: true,
        HttpOnly: true,
		Name: name,
		Value: value,
	}
	http.SetCookie(w, &cookie)
}

func GetCookie(r *http.Request, name string)string{
	cookie, _ := r.Cookie(name)
	return cookie.Value
}

func DeleteCookie(w http.ResponseWriter, cookies []string){
	for _,name := range cookies{
        // ruleid: cookie-missing-httponly
		cookie := &http.Cookie{
			Name:     name,
			Value:    "",
			Expires: time.Unix(0, 0),
		}
		http.SetCookie(w, cookie)
	}
}