FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

node_exporter -- bypass security with cache poisoning

Affected packages
node_exporter < 1.5.0

Details

VuXML ID d835c54f-a4bd-11ed-b6af-b42e991fc52e
Discovery 2021-11-28
Entry 2023-02-04

Prometheus team reports:

Prometheus and its exporters can be secured by a web.yml file that specifies usernames and hashed passwords for basic authentication. Passwords are hashed with bcrypt, which means that even if you have access to the hash, it is very hard to find the original password back. Passwords are hashed with bcrypt, which means that even if you have access to the hash, it is very hard to find the original password back. However, a flaw in the way this mechanism was implemented in the exporter toolkit makes it possible with people who know the hashed password to authenticate against Prometheus. A request can be forged by an attacker to poison the internal cache used to cache the computation of hashes and make subsequent requests successful. This cache is used in both happy and unhappy scenarios in order to limit side channel attacks that could tell an attacker if a user is present in the file or not.

References

CVE Name CVE-2022-46146
URL https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-46146