CVE-2020-10684
Description
A flaw was found in the Ansible Engine. When using ansible_facts as a subkey of itself, and promoting it to a variable when injecting is enabled, overwriting the ansible_facts after the clean, an attacker could take advantage of this by altering the ansible_facts leading to privilege escalation or code injection. The highest threat from this vulnerability are to data integrity and system availability.
Statement
- Ansible Engine 2.7.16, 2.8.10, and 2.9.6 as well as previous versions are affected.
- Ansible Tower 3.4.5, 3.5.5 and 3.6.3 as well as previous versions are affected.
- Red Hat Gluster Storage and Red Hat Ceph Storage no longer maintains their own version of Ansible. The fix will be consumed from core Ansible. But we still ship ansible separately for ceph ubuntu.
- Red Hat OpenStack Platform does package the affected code. However, because RHOSP does not use ansible_facts as a subkey directly, the RHOSP impact has been reduced to Moderate and no update will be provided at this time for the RHOSP ansible package.
Mitigation
Currently, there is not a known mitigation except avoiding the functionality of using ansible_facts as a subkey.
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 Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.9 | 7.1 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | Required | None | N/A |
| Scope | Changed | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data; Read Files or Directories
An attacker could read sensitive data, either by reading the data directly from a data store that is not restricted, or by accessing insufficiently-protected, privileged functionality to read the data.
Integrity
Technical Impact: Modify Application Data; Modify Files or Directories
An attacker could modify sensitive data, either by writing the data directly to a data store that is not restricted, or by accessing insufficiently-protected, privileged functionality to write the data.
Access Control
Technical Impact: Gain Privileges or Assume Identity; Bypass Protection Mechanism
An attacker could gain privileges by modifying or reading critical data directly, or by accessing privileged functionality.
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
An attacker could gain unauthorized access to resources on the system and excessively consume those resources, leading to a denial of service.
Acknowledgements
Red Hat would like to thank Damien Aumaitre (Quarkslab) and Nicolas Surbayrole (Quarkslab) for reporting this issue.
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