CVE-2020-1747

Description

A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.59% Top 20%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org
Affected: Red Hat PyYAML
Published at:
Updated at:

References

Link Tags
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WORRFHPQVAFKKXXWLSSW6XKUYLWM6CSH/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBJA3SGNJKCAYPSHOHWY3KBCWNM5NYK2/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K5HEPD7LEVDPCITY5IMDYWXUMX37VFMY/ vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00017.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00017.html vendor advisory mailing list third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMQXSZXNJT6ERABJZAAICI3DQSQLCP3D/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7PPAS6C4SZRDQLR7C22A5U3QOLXY33JX/ vendor advisory
https://www.oracle.com/security-alerts/cpujul2022.html third party advisory patch
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1747 patch third party advisory issue tracking
https://github.com/yaml/pyyaml/pull/386 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2020-1747?
CVE-2020-1747 has been scored as a critical severity vulnerability.
How to fix CVE-2020-1747?
To fix CVE-2020-1747, 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-2020-1747 being actively exploited in the wild?
It is possible that CVE-2020-1747 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-1747?
CVE-2020-1747 affects Red Hat PyYAML.
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