CVE-2020-1726

Description

A flaw was discovered in Podman where it incorrectly allows containers when created to overwrite existing files in volumes, even if they are mounted as read-only. When a user runs a malicious container or a container based on a malicious image with an attached volume that is used for the first time, it is possible to trigger the flaw and overwrite files in the volume.

Statement

Podman versions earlier than 1.6.0 are not affected. That includes the podman versions in OCP 4.2 and earlier.

Mitigation

If a volume needs to be attached as read-only to an untrusted container or container image, first attach it to a trusted container. Using the volume for the first time will make the attack impossible for other containers that are going to use the volume.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score5.95.9N/A
Attack VectorNetworkNetworkN/A
Attack ComplexityHighHighN/A
Privileges RequiredNoneNoneN/A
User InteractionNoneNoneN/A
ScopeUnchangedUnchangedN/A
ConfidentialityNoneNoneN/A
Integrity ImpactHighHighN/A
Availability ImpactNoneNoneN/A

Vector

Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Understanding the Weakness (CWE)

CWE-552

Confidentiality,Integrity

Technical Impact: Read Files or Directories; Modify Files or Directories

Acknowledgements

This issue was discovered by Tristan De Cacqueray (Red Hat).

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