Vulnerability identifier: #VU21781
Vulnerability risk: High
CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
PyYAML
Web applications /
Modules and components for CMS
Vendor: The YAML Project
Description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to insufficient validation of user-supplied input in the "yaml.load()" API (yaml.safe_load is not used). A remote attacker can execute arbitrary code on the target system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
PyYAML: 3.01 - 3.13
External links
http://github.com/yaml/pyyaml/blob/master/CHANGES
http://github.com/yaml/pyyaml/pull/74
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.