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The biggest problem of cookie is: it is stored in user’s computer, which leads to many possibilities. The server lost control of the cookie’s privacy once it is sent to client. As the cookie data is stored in user’s computer, the data can be leaked when: Vulnerability in operating system is exploited by attacker.
Data sent over SSL (HTTPS) is fully encrypted, headers included (hence cookies), only the Host you are sending the request to is not encrypted. It also means that the GET request is encrypted (the rest of the URL).
What does the secure attribute of an HTTP cookie signify?
When a cookie has the Secure attribute, the user agent will include the cookie in an HTTP request only if the request is transmitted over a secure channel (typically HTTPS). Although seemingly useful for protecting cookies from active network attackers, the Secure attribute protects only the cookie’s confidentiality.
Securing HTTP Cookies
- HTTP Only. One level of security with cookies is to enable HTTP Only.
- Encrypted Cookies. HTTP cookies often come from the web server so consider encrypting cookie values.
- Client-Side Persistence. The browser will use cookies to persist data across HTTP requests.
- Conclusion.
The Path attribute plays a major role in setting the scope of the cookies in conjunction with the domain . In addition to the domain, the URL path that the cookie is valid for can be specified. If the domain and path match, then the cookie will be sent in the request.
Can I see HttpOnly cookies in Chrome?
Yes. Enter document. cookie in the console, and you’ll see that none of the checked cookies are visible. HTTP = HttpOnly flag, Secure = secure flag.
The user agent (possibly with user interaction) MAY determine what level of security it considers appropriate for “secure” cookies. The Secure attribute should be considered security advice from the server to the user agent, indicating that it is in the session’s interest to protect the cookie contents.
This way, the authentication cookie will not be disclosed in insecure communication (HTTP). It turns out, however, that an insecure HTTP response can overwrite a cookie with secure flag in modern browsers.
What happens when a cookie has a Secure flag?
When a cookie has secure flag set, it will only be sent over secure HTTPS, which is HTTP over SSL/TLS. This way, the authentication cookie will not be disclosed in insecure communication (HTTP). It turns out, however, that an insecure HTTP response can overwrite a cookie with secure flag in modern browsers.
The reason it is not used very often may be one of: This scenario may just not be very common. Usually if you care enough to make part of your site secure, you’d restrict the login session just to that secure part, or you’d make the entire site always use HTTPS (like Paypal).