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GHSA-q257-vv4p-fg92
http-signatureAffected 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.
Proof of Concept
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
Recommendation
Update to version 0.10.0 or higher.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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