CVE-2022-23227
About
NUUO NVRmini2 through 3.11 allows an unauthenticated attacker to upload an encrypted TAR archive, which can be abused to add arbitrary users because of the lack of handle_import_user.php authentication. When combined with another flaw (CVE-2011-5325), it is possible to overwrite arbitrary files under the web root and achieve code execution as root.
Rainforest analyst review
The NUUO NVRmini2 exposes handle_import_user.php with no authentication check, so an unauthenticated attacker can upload a crafted, encrypted TAR archive and use it to add arbitrary user accounts — including administrators. Chained with an older path-traversal flaw in how the archive is extracted (CVE-2011-5325), the same upload writes files outside the intended directory, overwriting content under the web root and yielding code execution as root.
The NVRmini2 is a network video recorder — surveillance infrastructure that sits quietly on networks, is frequently reachable from the internet, and rarely receives attention after install. Devices in this class are long-standing targets for botnet operators precisely because they are powerful, always-on, and unpatched, and NUUO recorders have a history of exactly this kind of pre-auth compromise. Treat exposed units as end-of-life liabilities: pull them off the public internet, segment the camera network, and replace hardware that no longer receives fixes rather than trusting a firmware update to hold.
References
- https://github.com/pedrib/PoC/blob/master/advisories/NUUO/nuuo_nvrmini_round2.mkd
- https://github.com/rapid7/metasploit-framework/pull/16044
- https://news.ycombinator.com/item?id=29936569
- https://portswigger.net/daily-swig/researcher-discloses-alleged-zero-day-vulnerabilities-in-nuuo-nvrmini2-recording-device
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-23227
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Frequently asked questions
What is CVE-2022-23227?
NUUO NVRmini2 through 3.11 allows an unauthenticated attacker to upload an encrypted TAR archive, which can be abused to add arbitrary users because of the lack of handle_import_user.php authentication. When combined with another flaw (CVE-2011-5325), it is possible to overwrite arbitrary files under the web root and achieve code execution as root.
How severe is CVE-2022-23227?
CVE-2022-23227 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-2022-23227 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-2022-23227?
Public advisories list the following as affected: nvrmini2, nvrmini2 firmware. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2022-23227?
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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