Vulnerability Details : CVE-2020-8557
The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.
Exploit prediction scoring system (EPSS) score for CVE-2020-8557
Probability of exploitation activity in the next 30 days: 0.04%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 10 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-8557
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
[email protected] |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
[email protected] |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
[email protected] |
CWE ids for CVE-2020-8557
-
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.Assigned by:
- [email protected] (Secondary)
- [email protected] (Primary)
References for CVE-2020-8557
-
https://github.com/kubernetes/kubernetes/issues/93032
Issue Tracking;Patch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20200821-0002/
Third Party Advisory
-
https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ
Mailing List;Third Party Advisory
Products affected by CVE-2020-8557
- cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
- cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*
- cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*