CVE-2020-14343
Public on 2021-02-09
Modified on 2023-03-16
Description
A vulnerability was discovered in the PyYAML library in versions before 5.4, 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. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.
Severity
Critical
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Core | PyYAML | Not Affected | ||
| Amazon Linux 2023 | PyYAML | Not Affected | ||
| Amazon Linux 1 | python-PyYAML | Not Affected | ||
| Amazon Linux 1 | python27-PyYAML | Not Affected | ||
| Amazon Linux 2 - Core | python3-PyYAML | Not Affected | ||
| Amazon Linux 2023 | python3-pyyaml | Not Affected |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | CVSSv2 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
| NVD | CVSSv3 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |