Ubuntu update for pyyaml



Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-14343
CWE-ID CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

python-yaml (Ubuntu package)
Operating systems & Components / Operating system package or component

python3-yaml (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Input validation error

EUVDB-ID: #VU54520

Risk: High

CVSSv4.0: 8.9 [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:P/U:Amber]

CVE-ID: CVE-2020-14343

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input when processing untrusted YAML files through the full_load method or with the FullLoader loader. A remote attacker can pass specially crafted input to the application and execute arbitrary code on the system by abusing the python/object/new constructor.

Note, the vulnerability exists due to incomplete patch for vulnerability #VU25823.

Mitigation

Update the affected package pyyaml to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 20.10

python-yaml (Ubuntu package): before 5.3.1-1ubuntu0.1

python3-yaml (Ubuntu package): before 5.3.1-1ubuntu0.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4940-1


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. However, proof of concept for this vulnerability is available.



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