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GHSA-f8v5-jmfh-pr69
No affected components available
Summary
A low privilege user account with page edit privilege can read any server files using Twig Syntax. This includes Grav user account files - /grav/user/accounts/*.yaml. This file stores hashed user password, 2FA secret, and the password reset token. This can allow an adversary to compromise any registered account by resetting a password for a user to get access to the password reset token from the file or by cracking the hashed password.
Proof Of Concept
{{ read_file('/var/www/html/grav/user/accounts/riri.yaml') }}
Use the above Twig template syntax in a page and observe that the administrator riri's authentication details are exposed accessible by any unauthenticated user.
As an additional proof of concept for reading system files, observe the /etc/passwd file read using the following Twig syntax:
{{ read_file('/etc/passwd') }}
Impact
This can allow a low privileged user to perform a full account takeover of other registered users including Adminsitrators. This can also allow an adversary to read any file in the web server.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a low impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
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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