CyberSecBulletin
CVE-2024-3273Exploited in the wildNVD status: Analyzed

D-Link Multiple NAS Devices Command Injection

Published Updated By the CyberSecBulletin desk

CVE-2024-3273 is a critical-severity improper neutralization of special elements used in a command vulnerability in DNS-320L from D-Link, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected DNS-320L versions: 20240403. The record does not name a fixed version, so check the vendor advisory. CISA added it to the Known Exploited Vulnerabilities catalogue on April 11, 2024, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Check which version of DNS-320L you run against the affected versions below, and install the vendor's latest release.
  2. CISA's required action: This vulnerability affects legacy D-Link products. All associated hardware revisions have reached their end-of-life (EOL) or end-of-service (EOS) life cycle and should be retired and replaced per vendor instructions.
  3. Read the advisory on supportannouncement.us.dlink.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
D-LinkDNS-320L20240403Not stated
D-LinkDNS-32520240403Not stated
D-LinkDNS-327L20240403Not stated
D-LinkDNS-340L20240403Not stated
D-Linkdns-320l_firmware20240403Not stated
D-Linkdns-325_firmware20240403Not stated
D-Linkdns-327l_firmware20240403Not stated
D-Linkdns-340l_firmware20240403Not stated
D-LinkDns-120 FirmwareNot specified in the recordNot stated
D-LinkDnr-202l FirmwareNot specified in the recordNot stated
D-LinkDns-315l FirmwareNot specified in the recordNot stated
D-LinkDns-320 FirmwareNot specified in the recordNot stated
D-LinkDns-320lw FirmwareNot specified in the recordNot stated
D-LinkDns-321 FirmwareNot specified in the recordNot stated
D-LinkDnr-322l FirmwareNot specified in the recordNot stated
D-LinkDns-323 FirmwareNot specified in the recordNot stated
D-LinkDns-326 FirmwareNot specified in the recordNot stated
D-LinkDnr-326 FirmwareNot specified in the recordNot stated
D-LinkDns-343 FirmwareNot specified in the recordNot stated
D-LinkDns-345 FirmwareNot specified in the recordNot stated
D-LinkDns-726-4 FirmwareNot specified in the recordNot stated
D-LinkDns-1100-4 FirmwareNot specified in the recordNot stated
D-LinkDns-1200-05 FirmwareNot specified in the recordNot stated
D-LinkDns-1550-04 FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.3HighCNA (vuldb.com)
CVSS 3.19.8CriticalNVD
CVSS 2.07.5HighCNA (vuldb.com)

Official description

** UNSUPPORTED WHEN ASSIGNED ** A vulnerability, which was classified as critical, was found in D-Link DNS-320L, DNS-325, DNS-327L and DNS-340L up to 20240403. Affected is an unknown function of the file /cgi-bin/nas_sharing.cgi of the component HTTP GET Request Handler. The manipulation of the argument system leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-259284. 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Neutralization of Special Elements used in a Command

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

How developers prevent this class of flaw

  • If at all possible, use library calls rather than external processes to recreate the desired functionality.
  • If possible, ensure that all external commands called from the program are statically created.
  • Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.

More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)

Timeline

  1. CVE record published.
  2. Added to CISA's Known Exploited Vulnerabilities catalogue.
  3. CISA published its SSVC assessment (exploitation: active, automatable: yes, technical impact: total).
  4. Deadline for US federal agencies to remediate, set by CISA.
  5. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Technical write-ups (may include proof of concept)

Other references

Other vulnerabilities in DNS-320L

All DNS-320L vulnerabilities

Recent Improper Neutralization of Special Elements used in a Command vulnerabilities

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