Advisory Details

April 15th, 2020

Eaton HMiSoft VU3 File Parsing wTextLen Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-20-493
ZDI-CAN-10473

CVE ID CVE-2020-10637
CVSS SCORE 3.3, AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
AFFECTED VENDORS Eaton
AFFECTED PRODUCTS HMiSoft
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information 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 wTextLen information within VU3 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 buffer. An attacker can leverage this in conjunction with other vulnerabilities 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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