Vulnerability identifier: #VU51767

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-29418, CVE-2021-28918

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

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

Vendor: Olivier Poitrey

Description

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in octal literals. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to intranets, VPNs, containers, adjacent VPC instances, or LAN hosts.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Netmask: 0.0.1 - 2.0.0

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External links
http://github.com/sickcodes/security/blob/master/advisories/SICK-2021-011.md
http://github.com/advisories/GHSA-pch5-whg9-qr2r
http://www.npmjs.com/advisories/1658
http://github.com/rs/node-netmask/commit/3f19a056c4eb808ea4a29f234274c67bc5a848f4
http://vuln.ryotak.me/advisories/6

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