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cookie without secure flag - different issues

Robin Wood Mar 20, 2017 10:26AM UTC

Can you explain the difference in these two issue which have both been flagged on the same site?

Issue:  SSL cookie without secure flag set
Severity:  Medium
Confidence:  Firm
Host:  https://abc
Path:  /

Set-Cookie: ASP.NET_SessionId=054nklywi05mesavwtc3g4ck; path=/; HttpOnly

Issue:  SSL cookie without secure flag set
Severity:  Information
Confidence:  Certain
Host:  https://abc
Path:  /login.aspx

Set-Cookie: .ASPXAUTH=686...3E29CB0; path=/; HttpOnly

They are both from different pages but both for cookies which obviously don't have the secure flag. Why is one Informational and one Medium? And what is the difference between Firm and Certain?

It doesn't really make a difference in this instance but if there are other findings which are sometimes logged as info and sometimes as more serious then it might trip some people up.

Dafydd Stuttard Mar 20, 2017 11:45AM UTC Support Center agent

Burp tries to identify session tokens in cookies, and it looks like in this case it is deciding that one of the cookies does contain a session token, but it isn’t sure about the other.

The (apparent) session token is reported with medium severity (and firm confidence, since we might be wrong about it being a session token) while the other token is reported as information only (and therefore certain confidence).

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