High severity · published Apr 10, 2019
CVE-2018-20321
An issue was discovered in Rancher 2 through 2.1.5
8.8
CVSS
1.8%
EPSS
No
On KEV
Description
An issue was discovered in Rancher 2 through 2.1.5. Any project member with access to the default namespace can mount the netes-default service account in a pod, and then use that pod to execute administrative privileged commands against the k8s cluster. This could be mitigated by isolating the default namespace in a separate project, where only cluster admins can be given permissions to access. As of 2018-12-20, this bug affected ALL clusters created or imported by Rancher.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
Rancher · Suse
2.0.0 through 2.1.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-20321
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-20321
Vendor Advisory
https://forums.rancher.com/c/announcements
Mitigation
https://rancher.com/blog/2019/2019-01-29-explaining-security-vulnerabilities-addressed-in-rancher-v2-1-6-and-v2-0-11/
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