2.4! Display 55, SD/U12.55.11-825: Authentication Bypass by Capture-replay
CVE-2024-4009 is a high-severity authentication bypass by capture-replay vulnerability in 2.4! Display 55, SD/U12.55.11-825 from ABB, Busch-Jaeger, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. Affected 2.4! Display 55, SD/U12.55.11-825 versions: 1.00. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.14% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update 2tma310010b0001 Firmware to 1.02 or a later version.
- Update 2tma310011b0001 Firmware to 1.02 or a later version.
- Update 2tma310011b0002 Firmware to 1.02 or a later version.
- Read the advisory on search.abb.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| ABB, Busch-Jaeger | 2.4! Display 55, SD/U12.55.11-825 | 1.00 | Not stated |
| ABB, Busch-Jaeger | 2.4! Display 55, SD/SD/U12.55.1-825 | 1.00 | Not stated |
| ABB, Busch-Jaeger | 2.4! Display 63, SD/U12.63.11-825 | 1.00 | Not stated |
| ABB, Busch-Jaeger | RoomTouch 4", RT/U12.86.1-825 | 1.00 | Not stated |
| ABB, Busch-Jaeger | RoomTouch 4", RT/U12.86.11-825 | 1.00 | Not stated |
| ABB, Busch-Jaeger | 2,4'' Display 70, SD/U12.70.11-4015 | 1.00 | Not stated |
| ABB, Busch-Jaeger | 2,4'' Display 70, SD-U12-70-1-4015 | 1.00 | Not stated |
| ABB, Busch-Jaeger | RoomTouch 4", RT/U12.86.11-811 | 1.00 | Not stated |
| ABB, Busch-Jaeger | RoomTouch 4", RT-U12-86-1-811 | 1.00 | Not stated |
| ABB, Busch-Jaeger | BCU KNX, BA-U1.0.11 | 1.3.0.33 | Not stated |
| ABB, Busch-Jaeger | BCU KNX, BA-U1.0.1 | 1.3.0.33 | Not stated |
| ABB, Busch-Jaeger | BCU KNX, BA-U1.0.21 | 1.3.0.33 | Not stated |
| ABB | 2tma310010b0001 Firmware | before 1.02 | 1.02 |
| ABB | 2tma310011b0001 Firmware | before 1.02 | 1.02 |
| ABB | 2tma310011b0002 Firmware | before 1.02 | 1.02 |
| ABB | 2tma310010b0003 Firmware | before 1.02 | 1.02 |
| ABB | 2tma310011b0003 Firmware | before 1.02 | 1.02 |
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
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.3 | High | CNA (ch.abb.com) |
| CVSS 3.1 | 9.2 | Critical | CNA (ch.abb.com) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
Replay Attack in ABB, Busch-Jaeger, FTS Display (version 1.00) and BCU (version 1.3.0.33) allows attacker to capture/replay KNX telegram to local KNX Bus-System
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.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in 2.4! Display 55, SD/U12.55.11-825
- 8.8 High severity
Recent Authentication Bypass by Capture-replay vulnerabilities
- 8.1 High severity
- 9.8 Critical severity
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
- 8.8 High severity
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