ThinManager ThinServer: Out-of-bounds Read
CVE-2023-27857 is a high-severity out-of-bounds read vulnerability in ThinManager ThinServer from Rockwell Automation, 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 ThinManager ThinServer versions: 6.x - 10.x; 11.0.0 - 11.0.5; 11.1.0 - 11.1.5, 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 18.3% chance of exploitation within 30 days, which is in the top 2.73% of all scored CVEs.
EPSS places it among the vulnerabilities most likely to be exploited soon.
What to do
- Update Thinmanager to 11.0.5 or 11.1.5 or 11.2.6 or 12.0.3, whichever matches your release line, or a later version.
- Read the advisory on rockwellautomation.custhelp.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 |
|---|---|---|---|
| Rockwell Automation | ThinManager ThinServer | 6.x - 10.x; 11.0.0 - 11.0.5; 11.1.0 - 11.1.5; 11.2.0 - 11.2.6; 12.0.0 - 12.0.4; 12.1.0 - 12.1.5; 13.0.0 - 13.0.1 | Not stated |
| Rockwell Automation | Thinmanager | 11.0.0 up to, but not including, 11.0.5; 11.1.0 up to, but not including, 11.1.5; 11.2.0 up to, but not including, 11.2.6; 12.0.0 up to, but not including, 12.0.3; 12.1.0 up to, but not including, 12.1.4; 13.0.0 | 11.0.5, 11.1.5, 11.2.6, 12.0.3, 12.1.4 |
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 (rockwellautomation.com) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
In affected versions, a heap-based buffer over-read condition occurs when the message field indicates more data than is present in the message field in Rockwell Automation's ThinManager ThinServer. An unauthenticated remote attacker can exploit this vulnerability to crash ThinServer.exe due to a read access violation.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
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
Other vulnerabilities in ThinManager ThinServer
- 9.3 Critical severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Out-of-bounds Read vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
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