CVE-2024-3272
About
** UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as very critical, has been found in D-Link DNS-320L, DNS-325, DNS-327L and DNS-340L up to 20240403. This issue affects some unknown processing of the file /cgi-bin/nas_sharing.cgi of the component HTTP GET Request Handler. The manipulation of the argument user with the input messagebus leads to hard-coded credentials. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-259283. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. NOTE: Vendor was contacted early and confirmed immediately that the product is end-of-life. It should be retired and replaced.
Rainforest analyst review
These D-Link network-attached storage devices — DNS-320L, DNS-325, DNS-327L, DNS-340L and related models — expose `/cgi-bin/nas_sharing.cgi`, which contains a hard-coded backdoor account. An attacker sends an HTTP GET request supplying the built-in `messagebus` username with an empty or fixed password and is authenticated as a valid user. The same interface carries a command-injection weakness, so once past the hard-coded credential the attacker runs arbitrary commands on the device with no legitimate access required.
All of the affected models are end-of-life, and D-Link has confirmed it will not patch them, so there is no fix to apply — only mitigation and replacement. Exploit details are public and these devices were swept up quickly into IoT botnet activity, since a large installed base of internet-exposed, unpatchable NAS boxes is exactly what mass scanners look for. The only sound response is to remove these units from the internet immediately, and ideally retire and replace them; if one must stay online temporarily, isolate it on a segment with no inbound exposure and treat any already-exposed device as compromised.
References
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Frequently asked questions
What is CVE-2024-3272?
** UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as very critical, has been found in D-Link DNS-320L, DNS-325, DNS-327L and DNS-340L up to 20240403. This issue affects some unknown processing of the file /cgi-bin/nas_sharing.cgi of the component HTTP GET Request Handler. The manipulation of the argument user with the input messagebus leads to hard-coded credentials.
How severe is CVE-2024-3272?
CVE-2024-3272 carries a CVSS 3.1 base score of 9.8, rated critical. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 99 out of 100, in the critical band.
How is CVE-2024-3272 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality High, integrity High and availability High.
Which products are affected by CVE-2024-3272?
Public advisories list the following as affected: dnr-202l, dnr-202l firmware, dnr-322l, dnr-322l firmware, dnr-326, dnr-326 firmware, +34. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2024-3272?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
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