high
7.8
CWE
913 538
Advisory Published
Advisory Published
Updated

CVE-2022-4318

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 SoftwareAffected VersionHow 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
Kubernetes CRI-O
Redhat Openshift Container Platform For Arm64=4.12
Redhat Openshift Container Platform For Linuxone=4.12
Redhat Openshift Container Platform For Power=4.12
Redhat Openshift Container Platform Ibm Z Systems=4.12
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux=9.0
Fedoraproject Extra Packages For Enterprise Linux=8.0
Fedoraproject Fedora=36
Fedoraproject Fedora=37
Redhat Openshift Container Platform For Arm64=4.11
Redhat Openshift Container Platform For Linuxone=4.11
Redhat Openshift Container Platform For Power=4.11
Redhat Openshift Container Platform Ibm Z Systems=4.11
go/github.com/cri-o/cri-o<1.26.0
1.26.0

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Parent vulnerabilities

(Appears in the following advisories)

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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