Information disclosure in Kubernetes CSI sidecar containers for external-provisioner



| Updated: 2020-12-22
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-11255
CWE-ID CWE-20
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Kubernetes
Server applications / Frameworks for developing and running applications

Vendor Kubernetes

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU23548

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-11255

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied input in Kubernetes CSI sidecar containers for external-provisioner (versions prior to 0.4.3 and 1.0.2, in version 1.1,  and versions prior to 1.2.2 and 1.3.1), external-snapshotter (versions prior to 0.4.2 and 1.0.2, in version 1.1, versions prior to 1.2.2), and external-resizer (versions 0.1,  and 0.2) . A local user can gain unauthorized PersistentVolume data access or volume mutation during snapshot, restore from snapshot, cloning and resizing operations.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Kubernetes: 1.12.0 - 1.16.3

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2019:4099
https://github.com/kubernetes/kubernetes/issues/85233
https://groups.google.com/forum/#!topic/kubernetes-security-announce/aXiYN0q4uIw


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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