CVE-2020-1747
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Pyyaml
PublishedMar 24, 2020
First seenMar 24, 2020
Weakness typeCWE-20Improper input validation
How to fix
Update
- pyyaml pyyaml5.3.1 or later
- pyyaml5.3.1 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WORRFHPQVAFKKXXWLSSW6XKUYLWM6CSH/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZBJA3SGNJKCAYPSHOHWY3KBCWNM5NYK2/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K5HEPD7LEVDPCITY5IMDYWXUMX37VFMY/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMQXSZXNJT6ERABJZAAICI3DQSQLCP3D/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7PPAS6C4SZRDQLR7C22A5U3QOLXY33JX/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyyaml pyyaml | 5.1 ≤ v < 5.3.1 | 5.3.1 |
| fedoraproject fedora | 30, 31, 32, 33 | — |
| opensuse leap | 15.1 | — |
| oracle communications_cloud_native_core_network_function_cloud_native_environment | 22.1.0 | — |
| pyyamlPyPI | 5.1b7 ≤ v < 5.3.1, 5.1 ≤ v < 5.3.1 | 5.3.1 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.