CVE-2022-4318: Cri-o: /etc/passwd tampering privesc
First published: Mon Dec 12 2022(Updated: )
### 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
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/cri-o | <0:1.24.4-10.rhaos4.11.git1ed5ac5.el8 | 0:1.24.4-10.rhaos4.11.git1ed5ac5.el8 |
| redhat/cri-o | <0:1.25.2-10.rhaos4.12.git0a083f9.el8 | 0:1.25.2-10.rhaos4.12.git0a083f9.el8 |
| go/github.com/cri-o/cri-o | <1.26.0 | 1.26.0 |
| CRI-O | ||
| All of | ||
| Any of | ||
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat OpenShift Container Platform for Power | =4.12 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat Enterprise Linux | =8.0 | |
| All of | ||
| Any of | ||
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat OpenShift Container Platform for Power | =4.12 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat Enterprise Linux | =9.0 | |
| Fedora EPEL | =8.0 | |
| Fedora | =36 | |
| Fedora | =37 | |
| All of | ||
| Any of | ||
| Red Hat OpenShift Container Platform | =4.11 | |
| Red Hat OpenShift Container Platform | =4.11 | |
| Red Hat OpenShift Container Platform for Power | =4.11 | |
| Red Hat OpenShift Container Platform | =4.11 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat OpenShift Container Platform for Power | =4.12 | |
| Red Hat OpenShift Container Platform | =4.12 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| Red Hat OpenShift Container Platform | =4.11 | |
| Red Hat OpenShift Container Platform | =4.11 | |
| Red Hat OpenShift Container Platform for Power | =4.11 | |
| Red Hat OpenShift Container Platform | =4.11 |
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Reference Links
- https://github.com/cri-o/cri-o/security/advisories/GHSA-cm9x-c3rh-7rc4
- https://github.com/cri-o/cri-o/pull/6450
- https://nvd.nist.gov/vuln/detail/CVE-2022-4318
- 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/advisories/GHSA-cm9x-c3rh-7rc4 (Advisory)
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155654
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155653
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155693
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155694
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155695
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155696
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155697
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155699
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155698
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2155700
- https://access.redhat.com/security/cve/cve-2022-4318
- https://www.cve.org/CVERecord?id=CVE-2022-4318 https://nvd.nist.gov/vuln/detail/CVE-2022-4318
Frequently Asked Questions
What is CVE-2022-4318?
CVE-2022-4318 is a vulnerability found in cri-o that allows the addition of arbitrary lines into /etc/passwd.
What is the impact of CVE-2022-4318?
The impact of CVE-2022-4318 is the ability to add entries to a container's /etc/passwd by crafting an environment variable with newlines.
How can the admission validation of username/UID be circumvented in CVE-2022-4318?
Admission validation of username/UID can be circumvented in CVE-2022-4318 by adding an entry with newlines to the container's /etc/passwd.
Which software versions are affected by CVE-2022-4318?
The software versions affected by CVE-2022-4318 include cri-o 1.26.0, Kubernetes Cri-o, Redhat Openshift Container Platform, Redhat Enterprise Linux, Fedoraproject Extra Packages For Enterprise Linux, and Fedoraproject Fedora.
What is the severity of CVE-2022-4318?
CVE-2022-4318 has a severity rating of 7.8 (high).
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