ewon_cosy_firmware: Cleartext Storage of Sensitive Information
CVE-2024-33892 is a high-severity cleartext storage of sensitive information vulnerability in ewon_cosy_firmware from HMS Networks, 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 versions 21.2s10, 22.1s3 as the first without the flaw, so updating ewon_cosy_firmware to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.45% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update ewon_cosy_firmware to 21.2s10 or 22.1s3, whichever matches your release line, or a later version.
- Read the advisory on hmsnetworks.blob.core.windows.net for workarounds and exact fixed builds.
- 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 |
|---|---|---|---|
| Hms-networks | ewon_cosy_firmware | 21.0 up to, but not including, 21.2s10; 22.0 up to, but not including, 22.1s3 | 21.2s10, 22.1s3 |
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
- 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 | 5.3 | Medium | CISA (ADP) |
Official description
Insecure Permissions vulnerability in Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are susceptible to leaking information through cookies. This is fixed in version 21.2s10 and 22.1s3
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Cleartext Storage of Sensitive Information
The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.
How developers prevent this class of flaw
- When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to encrypt the data at rest.
- In some systems/environments such as cloud, the use of double encryption (at both the software and hardware layer) might be required, and the developer might be solely responsible for both layers, instead of shared responsibility with the administrator of the broader system/environment.
More Cleartext Storage of Sensitive Information vulnerabilities (CWE-312)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- blog.syss.com/posts/hacking-a-secure-industrial-remote-access-gateway/Exploit, Third Party Advisory
Other references
Other vulnerabilities in ewon_cosy_firmware
- 9.1 Critical severity
- 7.2 High severity
- 8.8 High severity
Recent Cleartext Storage of Sensitive Information vulnerabilities
- 8.8 High severity
- 7.5 High severity
- 9.1 Critical severity
- 7.8 High severity
- 7.5 High severity
- 8.4 High severity
Spotted an error? Tell us.