CVE-2021-38305

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.64%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/23andMe/Yamale/releases/tag/3.0.8 third party advisory release notes
https://github.com/23andMe/Yamale/pull/165 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-38305?
CVE-2021-38305 has been scored as a high severity vulnerability.
How to fix CVE-2021-38305?
To fix CVE-2021-38305, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-38305 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-38305 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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