#VU76822 Improper Interaction Between Multiple Correctly-Behaving Entities in xmldom - CVE-2021-21366

Vulnerability identifier: #VU76822

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-21366

CWE-ID: CWE-435

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
xmldom
Web applications / Modules and components for CMS

Vendor: xmldom

Description

The vulnerability allows a remote attacker to gain access to the system.

The vulnerability exists due to xmldom do not correctly preserve system identifiers, FPIs or namespaces when repeatedly parsing and serializing maliciously crafted documents. A remote attacker can send a specially crafted file and make syntactic changes during XML processing in some downstream applications.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

xmldom: before 0.5.0

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External links
https://github.com/xmldom/xmldom/releases/tag/0.5.0
https://www.npmjs.com/package/xmldom
https://github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135
https://github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfv
https://lists.debian.org/debian-lts-announce/2023/01/msg00000.html

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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.