Baxter Spectrum Wireless Battery Module (WBM): Use of Externally-Controlled Format String
CVE-2022-26393 is a high-severity use of externally-controlled format string vulnerability in Baxter Spectrum Wireless Battery Module (WBM) from Baxter, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected Baxter Spectrum Wireless Battery Module (WBM) versions: 20D29. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.71% chance of exploitation within 30 days, higher than 54% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Baxter Spectrum Wireless Battery Module (WBM) you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Baxter | Baxter Spectrum Wireless Battery Module (WBM) | 20D29 | Not stated |
| Baxter | Spectrum Wireless Battery Module Firmware | 20d29 | Not stated |
| Baxter | Sigma Spectrum 35700bax Firmware | Not specified in the record | Not stated |
| Baxter | Sigma Spectrum 35700bax2 Firmware | Not specified in the record | Not stated |
| Baxter | Baxter Spectrum Iq 35700bax3 Firmware | Not specified in the record | 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
- 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
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 5.0 | Medium | CNA (baxter.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
The Baxter Spectrum WBM is susceptible to format string attacks via application messaging. An attacker could use this to read memory in the WBM to access sensitive information or cause a Denial of Service (DoS) on the WBM.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use of Externally-Controlled Format String
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
How developers prevent this class of flaw
- Choose a language that is not subject to this flaw.
- Ensure that all format string functions are passed a static string which cannot be controlled by the user, and that the proper number of arguments are always sent to that function as well. If at all possible, use functions that do not support the %n operator in format strings.
- Run compilers and linkers with high warning levels, since they may detect incorrect usage.
More Use of Externally-Controlled Format String vulnerabilities (CWE-134)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cisa.gov/uscert/ics/advisories/icsma-22-251-01Third Party Advisory, US Government Resource
Recent Use of Externally-Controlled Format String vulnerabilities
- 9.8 Critical severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.8 High severity
- 5.5 Medium severity
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