Arbitrary Code Execution Vulnerability in PyYAML by YAML
CVE-2017-18342

9.8CRITICAL

Key Information:

Vendor

Pyyaml

Status
Pyyaml
Vendor
CVE Published:
27 June 2018

What is CVE-2017-18342?

The PyYAML library, prior to version 5.1, had a security flaw in its yaml.load() API, allowing the execution of arbitrary code when handling untrusted input. This vulnerability arises because the load() function can process malicious YAML content, leading to potential code execution in the context of the application using it. To mitigate risks, the load() function has been deprecated in version 5.1, with a new 'UnsafeLoader' introduced to maintain compatibility while enhancing security.

References

https://github.com/yaml/pyyaml/pull/74
x_refsource_MISC
https://github.com/yaml/pyyaml/blob/master/CHANGES
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA

EPSS Score

6% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.