Zmm200 Firmware: Direct Request
CVE-2022-42953 is a high-severity direct request vulnerability in Zmm200 Firmware from ZkTeco, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 15.00 as the first without the flaw, so updating Zmm200 Firmware to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 5.16% chance of exploitation within 30 days, which is in the top 7.44% of all scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Zmm200 Firmware to 15.00 or a later version.
- Update Zmm210 Firmware to 15.00 or a later version.
- Update Zmm220 Firmware to 15.00 or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zkteco | Zmm200 Firmware | before 15.00 | 15.00 |
| Zkteco | Zmm210 Firmware | before 15.00 | 15.00 |
| Zkteco | Zmm220 Firmware | before 15.00 | 15.00 |
| Zkteco | Zem720 Firmware | before 8.88 | 8.88 |
| Zkteco | Zem600 Firmware | before 8.88 | 8.88 |
| Zkteco | Zem800 Firmware | before 8.88 | 8.88 |
| Zkteco | Zem510 Firmware | before 8.88 | 8.88 |
| Zkteco | Zem560 Firmware | before 8.88 | 8.88 |
| Zkteco | Zem760 Firmware | before 8.88 | 8.88 |
| Zkteco | Zem500 Firmware | before 8.88 | 8.88 |
Version data comes from NVD's product matching. 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
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.1 | 7.5 | High | CISA (ADP) |
Official description
Certain ZKTeco products (ZEM500-510-560-760, ZEM600-800, ZEM720, ZMM) allow access to sensitive information via direct requests for the form/DataApp?style=1 and form/DataApp?style=0 URLs. The affected versions may be before 8.88 (ZEM500-510-560-760, ZEM600-800, ZEM720) and 15.00 (ZMM200-220-210). The fixed versions are firmware version 8.88 (ZEM500-510-560-760, ZEM600-800, ZEM720) and firmware version 15.00 (ZMM200-220-210).
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Direct Request
The web application does not adequately enforce appropriate authorization on all restricted URLs, scripts, or files.
How developers prevent this class of flaw
- Apply appropriate access control authorizations for each access to all restricted URLs, scripts or files.
- Consider using MVC based frameworks such as Struts.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- seclists.org/fulldisclosure/2022/Oct/23Exploit, Mailing List, Third Party Advisory
- redteam-pentesting.de/en/advisories/-advisories-publicised-vulnerability-analysesExploit, Third Party Advisory
Recent Direct Request vulnerabilities
- 9.1 Critical severity
- 8.0 High severity
- 7.5 High severity
- 7.5 High severity
- 8.0 High severity
- 7.5 High severity
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