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RUSTSEC-2022-0103
No affected components available
The coreos-installer is a program to fetch a disk image and stream it to a target disk.
During the installation process the installation image gpg signatures are verified.
The signature verification can be bypassed for gzip-compressed images due to a flaw in gzip coreos-installer wrapper.
When the decoder encounters the gzip trailer, it signals EOF to its output and does not continue reading from its input. As a result, earlier wrappers don't notice that they've reached EOF.
In particular, the GPG wrapper does not check the exit code of GPG.
Thus, if an attacker can substitute an attacker-controlled gzipped disk image, installation will complete successfully without a valid signature.
This vulnerability impacts only specific, User-Provisioned Infrastructure (UPI) installation methods where coreos-installer is used and where gzip-compressed images are configured as the installation source.
The Installer-Provisioned Infrastructure (IPI) bare-metal installs do use coreos-installer, but this installation method uses an install image embedded in the live OS image (ISO or PXE image), therefore is not affected by this vulnerability.
This vulnerability is specific to some upstream Fedora CoreOS installation flows.
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high 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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