Advisory Details

April 15th, 2020

Eaton HMiSoft VU3 File Parsing wKPFStringLen Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-475
ZDI-CAN-10163

CVE ID CVE-2020-10639
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 HMiSoft
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Eaton HMiSoft. 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 wKPFStringLen information within VU3 files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Eaton has issued an update to correct this vulnerability. More details can be found at:
https://www.us-cert.gov/ics/advisories/icsa-20-105-01
DISCLOSURE TIMELINE
  • 2020-02-12 - Vulnerability reported to vendor
  • 2020-04-15 - Coordinated public release of advisory
CREDIT Natnael Samson (@NattiSamson)
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