Improper Access Control in PyYAML component for Python



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-20477
CWE-ID CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 PyYAML
Web applications / Modules and components for CMS

Vendor The YAML Project

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper access control

EUVDB-ID: #VU25542

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-20477

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the "load" and "load_all" functions. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PyYAML: 5.1

CPE2.3 External links

https://github.com/yaml/pyyaml/blob/master/CHANGES
https://www.exploit-db.com/download/47655
https://github.com/yaml/pyyaml/issues/265


Q & A

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.



###SIDEBAR###