#VU54033 Reliance on Reverse DNS Resolution for a Security-Critical Action in gupnp - CVE-2021-33516

Vulnerability identifier: #VU54033

Vulnerability risk: Medium

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-33516

CWE-ID: CWE-350

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
gupnp

Vendor: Gnome Development Team

Description

The vulnerability allows a remote attacker to perform DNS rebinding attacks.

The vulnerability exists due to a logic issue in GUPnP. A remote attacker can trick a victim's browser into triggering actions against local UPnP services implemented using this library and gain access to sensitive information (e.g. data exfiltration) or tamper with data.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

gupnp: 1.0.0 - 1.2.4

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External links
https://gitlab.gnome.org/GNOME/gupnp/-/issues/24
https://discourse.gnome.org/t/security-relevant-releases-for-gupnp-issue-cve-2021-33516/6536

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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.