Advisory Details

December 15th, 2020

(0Day) Eaton EASYsoft E70 File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability

ZDI-20-1443
ZDI-CAN-11082

CVE ID
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Eaton
AFFECTED PRODUCTS EASYsoft
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Eaton EASYsoft. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of E70 files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS

This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.

05/29/20 - ZDI reported the vulnerability to ICS-CERT
08/26/20 - The vendor requested technical clarification
08/27/20 - ZDI provided additional evidence
10/05/20 - ZDI requested a status update
10/08/20 - Eaton requested an extension
10/08/20 - ZDI granted an extension until December
12/10/20 - ZDI notified ICS-CERT of the intention to publish the report as 0-day advisory on 12/15/2020

-- Mitigation:
Given the nature of the vulnerability the only salient mitigation strategy is to restrict interaction with the application.


DISCLOSURE TIMELINE
  • 2020-05-29 - Vulnerability reported to vendor
  • 2020-12-15 - Coordinated public release of advisory
CREDIT Francis Provencher {PRL}
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