Vulnerability in Kubernetes
CVE-2019-1002101
The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes creates a tar inside the container, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.
EPSS: 0.132 (96.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Kubernetes — versions 1.13, 1.12, 1.11
- Redhat Openshift_container_platform — versions 3.9, 3.10, 3.11
Weakness classification (CWE)
Public proof-of-concept exploits
- brompwnie/CVE-2019-1002101-Helpers
- 0xT11/CVE-POC
- 43622283/awesome-cloud-native-security
- ARPSyndicate/cvemon
- Lee-SungYoung/Delicious-Hot-Six
- Lee-SungYoung/Kube-Six
- LouisLiuNova/container-escape-exploits
- Metarget/awesome-cloud-native-security
- Metarget/metarget
- adavarski/HomeLab-Proxmox-k8s-DevSecOps-playground
References
- josh@bress.net (Patch, Third Party Advisory, x_refsource_MISC)
- josh@bress.net (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- josh@bress.net (x_refsource_REDHAT, vendor-advisory)
- josh@bress.net (x_refsource_REDHAT, vendor-advisory)
- josh@bress.net (x_refsource_REDHAT, vendor-advisory)
- josh@bress.net (x_refsource_FEDORA, vendor-advisory)
- josh@bress.net (mailing-list, x_refsource_MLIST)
- josh@bress.net (mailing-list, x_refsource_MLIST)
- josh@bress.net (x_refsource_FEDORA, vendor-advisory)
- josh@bress.net (x_refsource_MISC)
Frequently asked questions
- What is CVE-2019-1002101?
- CVE-2019-1002101 is a medium-severity vulnerability in Kubernetes, classified under Improper Link Resolution Before File Access. CVSS score: 6.4/10. Published 2019-04-01.
- How severe is CVE-2019-1002101?
- Medium severity. CVSS v3 base score is 6.4 out of 10.
- Is CVE-2019-1002101 known to be exploited?
- 25 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.