Affected versions of http-signature
contain a vulnerability which can allow an attacker in a privileged network position to modify header names and change the meaning of the request, without requiring an updated signature.
This problem occurs because vulnerable versions of http-signature
sign the contents of headers, but not the header names.
Consider this to be the initial, untampered request:
POST /pay HTTP/1.1
Host: example.com
Date: Thu, 05 Jan 2012 21:31:40 GMT
X-Payment-Source: src@money.com
X-Payment-Destination: dst@money.com
Authorization: Signature keyId="Test",algorithm="rsa-sha256",headers="x-payment-source x-payment-destination" MDyO5tSvin5...
And the request is intercepted and tampered as follows:
X-Payment-Source: dst@money.com // Emails switched
X-Payment-Destination: src@money.com
Authorization: Signature keyId="Test",algorithm="rsa-sha256",headers="x-payment-destination x-payment-source" MDyO5tSvin5...
In the resulting responses, both requests would pass signature verification without issue.
src@money.com\n
dst@money.com\n
Update to version 0.10.0 or higher.
{ "nvd_published_at": null, "cwe_ids": [ "CWE-20" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2020-06-16T21:50:21Z" }