CVE-2021-38305 Information

Description

23andMe Yamale before 3.0.8 allows remote attackers to execute arbitrary code via a crafted schema file. The schema parser uses eval as part of its processing and tries to protect from malicious expressions by limiting the builtins that are passed to the eval. When processing the schema each line is run through Python’s eval function to make the validator available. A well-constructed string within the schema rules can execute system commands; thus by exploiting the vulnerability an attacker can run arbitrary code on the image that invokes Yamale.

CVSS Vector

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

Reference

https://github.com/23andMe/Yamale/releases/tag/3.0.8 https://github.com/23andMe/Yamale/pull/165

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8