SIDIS Secured SmartPlug: Observable Discrepancy
CVE-2022-23304 is a critical-severity observable discrepancy vulnerability in SIDIS Secured SmartPlug from Siemens, 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. The record lists version V7.26.0310 as the first without the flaw, so updating SIDIS Secured SmartPlug to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.05% chance of exploitation within 30 days, higher than 82% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update SIDIS Secured SmartPlug to V7.26.0310 or a later version.
- Update Hostapd to 2.10 or a later version.
- Update Wpa Supplicant to 2.10 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 |
|---|---|---|---|
| Siemens | SIDIS Secured SmartPlug | before V7.26.0310 | V7.26.0310 |
| W1.fi | Hostapd | before 2.10 | 2.10 |
| W1.fi | Wpa Supplicant | before 2.10 | 2.10 |
| Fedora Project | Fedora | 35 | Not 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 system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 2.0 | 6.8 | Medium | NVD |
Official description
The implementations of EAP-pwd in hostapd before 2.10 and wpa_supplicant before 2.10 are vulnerable to side-channel attacks as a result of cache access patterns. NOTE: this issue exists because of an incomplete fix for CVE-2019-9495.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Observable Discrepancy
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
How developers prevent this class of flaw
- Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- w1.fi/security/2022-1/Mitigation, Third Party Advisory
Other references
Other vulnerabilities in SIDIS Secured SmartPlug
- 7.5 High severity
- 9.8 Critical severity
- 8.8 High severity
- 7.8 High severity
- 7.0 High severity
- 9.8 Critical severity
Recent Observable Discrepancy vulnerabilities
- 9.8 Critical severity
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