SmartConnect: Authentication Bypass by Capture-replay
CVE-2022-22806 is a critical-severity authentication bypass by capture-replay vulnerability in SmartConnect from Schneider Electric, 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 SmartConnect versions: SMT Series; SMC Series; SMTL Series, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 12.5% chance of exploitation within 30 days, which is in the top 3.71% of all scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of SmartConnect you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on se.com 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 |
|---|---|---|---|
| Schneider Electric | SmartConnect | SMT Series; SMC Series; SMTL Series; SCL Series; SMX Series | Not stated |
| Schneider Electric | Smt Series 1015 Ups Firmware | 04.5 and earlier | Not stated |
| Schneider Electric | Smc Series 1018 Ups Firmware | 04.2 and earlier | Not stated |
| Schneider Electric | Smtl Series 1026 Ups Firmware | 02.9 and earlier | Not stated |
| Schneider Electric | Scl Series 1029 Ups Firmware | 02.5 and earlier | Not stated |
| Schneider Electric | Scl Series 1030 Ups Firmware | 02.5 and earlier | Not stated |
| Schneider Electric | Scl Series 1036 Ups Firmware | 02.5 and earlier | Not stated |
| Schneider Electric | Scl Series 1037 Ups Firmware | 03.1 and earlier | Not stated |
| Schneider Electric | Smx Series 1031 Ups Firmware | 03.1 and earlier | 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 | 7.5 | High | NVD |
Official description
A CWE-294: Authentication Bypass by Capture-replay vulnerability exists that could cause an unauthenticated connection to the UPS when a malformed connection is sent. Affected Product: SmartConnect Family: SMT Series (SMT Series ID=1015: UPS 04.5 and prior), SMC Series (SMC Series ID=1018: UPS 04.2 and prior), SMTL Series (SMTL Series ID=1026: UPS 02.9 and prior), SCL Series (SCL Series ID=1029: UPS 02.5 and prior / SCL Series ID=1030: UPS 02.5 and prior / SCL Series ID=1036: UPS 02.5 and prior / SCL Series ID=1037: UPS 03.1 and prior), SMX Series (SMX Series ID=1031: UPS 03.1 and prior)
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authentication Bypass by Capture-replay
A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).
How developers prevent this class of flaw
- Utilize some sequence or time stamping functionality along with a checksum which takes this into account in order to ensure that messages can be parsed only once.
- Since any attacker who can listen to traffic can see sequence numbers, it is necessary to sign messages with some kind of cryptography to ensure that sequence numbers are not simply doctored along with content.
More Authentication Bypass by Capture-replay vulnerabilities (CWE-294)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in SmartConnect
- 9.8 Critical severity
- 9.1 Critical severity
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