#VU71361 Resource exhaustion in yaml - CVE-2021-4235

Vulnerability identifier: #VU71361

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-4235

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
yaml
Universal components / Libraries / Libraries used by multiple products

Vendor: The YAML Project

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when parsing YAML files. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

yaml: 2.2.0 - 2.2.2

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External links
https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
https://pkg.go.dev/vuln/GO-2021-0061
https://github.com/go-yaml/yaml/pull/375

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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.