APC Easy UPS Online Monitoring Software: Unrestricted Upload of File with Dangerous Type
CVE-2022-42971 is a critical-severity unrestricted upload of file with dangerous type vulnerability in APC Easy UPS Online Monitoring Software 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. The record lists versions V2.5-GA, V2.5-GA-01-22261 as the first without the flaw, so updating APC Easy UPS Online Monitoring Software to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.13% chance of exploitation within 30 days, higher than 67% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update APC Easy UPS Online Monitoring Software to V2.5-GA or V2.5-GA-01-22261, whichever matches your release line, or a later version.
- Update Schneider Electric Easy UPS Online Monitoring Software to V2.5-GS or V2.5-GS-01-22261, whichever matches your release line, or a later version.
- Update Easy Ups Online Monitoring Software to 2.5-gs-01-22320 or 2.5-gs, whichever matches your release line, or a later version.
- Read the advisory on download.schneider-electric.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 |
|---|---|---|---|
| Schneider Electric | APC Easy UPS Online Monitoring Software | Windows 7, 10, 11 Windows Server 2016, 2019, 2022 up to, but not including, V2.5-GA; (Windows 11, Windows Server 2019, 2022 up to, but not including, V2.5-GA-01-22261 | V2.5-GA, V2.5-GA-01-22261 |
| Schneider Electric | Schneider Electric Easy UPS Online Monitoring Software | Windows 7, 10, 11 Windows Server 2016, 2019, 2022 up to, but not including, V2.5-GS; Windows 11, Windows Server 2019, 2022 up to, but not including, V2.5-GS-01-22261 | V2.5-GS, V2.5-GS-01-22261 |
| Schneider Electric | Easy Ups Online Monitoring Software | before 2.5-gs-01-22320; before 2.5-gs | 2.5-gs-01-22320, 2.5-gs |
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 NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.8 | Critical | CNA (se.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
A CWE-434: Unrestricted Upload of File with Dangerous Type vulnerability exists that could cause remote code execution when the attacker uploads a malicious JSP file. Affected Products: APC Easy UPS Online Monitoring Software (Windows 7, 10, 11 & Windows Server 2016, 2019, 2022 - Versions prior to V2.5-GA), APC Easy UPS Online Monitoring Software (Windows 11, Windows Server 2019, 2022 - Versions prior to V2.5-GA-01-22261), Schneider Electric Easy UPS Online Monitoring Software (Windows 7, 10, 11 & Windows Server 2016, 2019, 2022 - Versions prior to V2.5-GS), Schneider Electric Easy UPS Online Monitoring Software (Windows 11, Windows Server 2019, 2022 - Versions prior to V2.5-GS-01-22261)
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
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 vulnerabilities in APC Easy UPS Online Monitoring Software
- 7.5 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.8 High severity
- 7.8 High severity
- 9.8 Critical severity
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 8.8 High severity
- 9.1 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.8 High severity
- 9.8 Critical severity
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