Easergy T200 (Modbus) Models: T200I, T200E…: Improper Restriction of Excessive Authentication Attempts
CVE-2024-2051 is a critical-severity improper restriction of excessive authentication attempts vulnerability in Easergy T200 (Modbus) Models: T200I, T200E, T200P, T200S, T200H 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 Easergy T200 (Modbus) Models: T200I, T200E, T200P, T200S, T200H versions: SC2-04MOD-07000104 through prior. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.76% chance of exploitation within 30 days, higher than 56% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update easergy_t200i_firmware to sc2-04mod-07000104 or a later version.
- Update easergy_t200e_firmware to sc2-04mod-07000104 or a later version.
- Update easergy_t200p_firmware to sc2-04mod-07000104 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 |
|---|---|---|---|
| Schneider Electric | Easergy T200 (Modbus) Models: T200I, T200E, T200P, T200S, T200H | SC2-04MOD-07000104 through prior | Not stated |
| Schneider Electric | Easergy T200 (IEC104) Models: T200I, T200E, T200P, T200S, T200H | SC2-04IEC-07000104 through prior | Not stated |
| Schneider Electric | Easergy T200 (DNP3) Models: T200I, T200E, T200P, T200S, T200H | SC2-04DNP-07000104 through prior | Not stated |
| Schneider Electric | easergy_t200i_firmware | before sc2-04mod-07000104 | sc2-04mod-07000104 |
| Schneider Electric | easergy_t200e_firmware | before sc2-04mod-07000104 | sc2-04mod-07000104 |
| Schneider Electric | easergy_t200p_firmware | before sc2-04mod-07000104 | sc2-04mod-07000104 |
| Schneider Electric | easergy_t200s_firmware | before sc2-04mod-07000104 | sc2-04mod-07000104 |
| Schneider Electric | easergy_t200h_firmware | before sc2-04mod-07000104 | sc2-04mod-07000104 |
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 CNA (se.com).
Official description
CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists that could cause account takeover and unauthorized access to the system when an attacker conducts brute-force attacks against the login form.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Restriction of Excessive Authentication Attempts
The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.
How developers prevent this class of flaw
- Common protection mechanisms include: Disconnecting the user after a small number of failed attempts Implementing a timeout Locking out a targeted account Requiring a computational task on the user's part.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator.
More Improper Restriction of Excessive Authentication Attempts vulnerabilities (CWE-307)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in Easergy T200 (Modbus) Models: T200I, T200E, T200P, T200S, T200H
- 7.5 High severity
- 8.2 High severity
Recent Improper Restriction of Excessive Authentication Attempts vulnerabilities
- 9.1 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.5 High severity
- 7.5 High severity
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