Input validation error in js-yaml (npm)

1) Input validation error

EUVDB-ID: #VU42769

Risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2013-4660

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, which allows remote attackers to execute arbitrary code via a crafted string that triggers an eval operation.

Mitigation

Install update from vendor's website.

Vulnerable software versions

js-yaml (npm): 0.2.0 - 2.0.3

CPE2.3

• cpe:2.3:a:npm:js-yaml:0.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:npm:js-yaml:0.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:npm:js-yaml:0.2.2:*:*:*:*:*:*:*

External links

https://portal.nodesecurity.io/advisories/js-yaml
https://nealpoole.com/blog/2013/06/code-execution-via-yaml-in-js-yaml-nodejs-module/

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, a fully functional exploit for this vulnerability is available.