System Management Module (SMM): Asymmetric Resource Consumption (Amplification)
CVE-2023-2992 is a high-severity asymmetric resource consumption (amplification) vulnerability in System Management Module (SMM) from Lenovo, 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. Affected System Management Module (SMM) versions: various. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.62% chance of exploitation within 30 days, higher than 50% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update nextscale_n1200_enclosure_firmware to fhet60b-3.40 or a later version.
- Update thinkagile_cp-cb-10e_firmware to tesm38c-1.2 or a later version.
- Update thinkagile_cp-cb-10_firmware to tesm38c-1.2 or a later version.
- Read the advisory on support.lenovo.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 |
|---|---|---|---|
| Lenovo | System Management Module (SMM) | various | Not stated |
| Lenovo | Fan Power Controller (FPC) | various | Not stated |
| Lenovo | nextscale_n1200_enclosure_firmware | before fhet60b-3.40 | fhet60b-3.40 |
| Lenovo | thinkagile_cp-cb-10e_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | thinkagile_cp-cb-10_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | thinkagile_hx_enclosure_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | thinkagile_vx_enclosure_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | thinksystem_d2_enclosure_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | thinksystem_da240_enclosure_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | thinksystem_dw612_enclosure_firmware | before tesm38c-1.2 | tesm38c-1.2 |
| Lenovo | Thinkagile Hx Enclosure Certified Node Firmware | before tesm38c-1.26 | tesm38c-1.26 |
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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA (lenovo.com) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
An unauthenticated denial of service vulnerability exists in the SMM v1, SMM v2, and FPC management web server which can be triggered under crafted conditions. Rebooting SMM or FPC will restore access to the management web server.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Asymmetric Resource Consumption (Amplification)
The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is asymmetric.
How developers prevent this class of flaw
- An application must make resources available to a client commensurate with the client's access level.
- An application must, at all times, keep track of allocated resources and meter their usage appropriately.
- Consider disabling resource-intensive algorithms on the server side, such as Diffie-Hellman key exchange.
More Asymmetric Resource Consumption (Amplification) vulnerabilities (CWE-405)
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
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