GHSA-cm9x-c3rh-7rc4

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GHSA-cm9x-c3rh-7rc4

Summary: CRI-O vulnerable to /etc/passwd tampering resulting in Privilege Escalation

Details: ### Impact It is possible to craft an environment variable with newlines to add entries to a container's /etc/passwd. It is possible to circumvent admission validation of username/UID by adding such an entry. Note: because the pod author is in control of the container's /etc/passwd, this is not considered a new risk factor. However, this advisory is being opened for transparency and as a way of tracking fixes. ### Patches 1.26.0 will have the fix. More patches will be posted as they're available. ### Workarounds Additional security controls like SELinux should prevent any damage a container is able to do with root on the host. Using SELinux is recommended because this class of attack is already possible by manually editing the container's /etc/passwd ### References

References: https://github.com/cri-o/cri-o/security/advisories/GHSA-cm9x-c3rh-7rc4, https://nvd.nist.gov/vuln/detail/CVE-2022-4318, https://github.com/cri-o/cri-o/pull/6450, https://access.redhat.com/errata/RHSA-2023:1033, https://access.redhat.com/errata/RHSA-2023:1503, https://access.redhat.com/security/cve/CVE-2022-4318, https://bugzilla.redhat.com/show_bug.cgi?id=2152703, https://github.com/cri-o/cri-o