SB2018030507 - Multiple vulnerabilities in Kubernetes
Published: March 5, 2018 Updated: July 30, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Denial of service (CVE-ID: CVE-2017-1002102)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 5.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows an adjacent authenticated attacker to cause DoS condition on the target system.
The weakness exists due to improper atomic writer volume handling when using a container with secret, configMap, projected, or downwardAPI volume. An adjacent attacker can delete arbitrary files and directories and cause the service to crash.
2) Information disclosure (CVE-ID: CVE-2017-1002101)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote authenticated attacker to obtain potentially sensitive information on the target system.
The weakness exists due to improper security restrictions when using subpath volume mounts with any volume type. A remote attacker can gain unauthorized access to files and directories.
3) Path traversal (CVE-ID: CVE-2018-1002100)
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to conduct path traversal attack on the target system.
The vulnerability exists due to the kubectl cp command insecurely handles tar data returned from the container. A remote unauthenticated attacker can conduct path traversal attack and overwrite arbitrary local files.
Remediation
Install update from vendor's website.