CVE-2021-20206
High
Description
An improper limitation of path name flaw was found in containernetworking/cni in versions before 0.8.1. When specifying the plugin to load in the 'type' field in the network configuration, it is possible to use special elements such as "../" separators to reference binaries elsewhere on the system. This flaw allows an attacker to execute other existing binaries other than the cni plugins/types, such as 'reboot'. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
SeverityHigh
CVSS7.2
Exploit probability—
ProductLinuxfoundation Container Network Interface
PublishedMar 26, 2021
First seenMar 26, 2021
Weakness typeCWE-20Improper input validation
How to fix
Update
- linuxfoundation container_network_interface0.8.1 or later
- github.com/containernetworking/cni0.8.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation container_network_interface | v < 0.8.1 | 0.8.1 |
| github.com/containernetworking/cniGo | v < 0.8.1 | 0.8.1 |
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