Advisory Details

January 29th, 2021

Fuji Electric V-Server Lite VPR File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-21-097
ZDI-CAN-11170

CVE ID CVE-2021-22637
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Fuji Electric
AFFECTED PRODUCTS V-Server Lite
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Fuji Electric V-Server Lite. 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 VPR 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 Fuji Electric has issued an update to correct this vulnerability. More details can be found at:
https://us-cert.cisa.gov/ics/advisories/icsa-21-026-01
DISCLOSURE TIMELINE
  • 2020-08-28 - Vulnerability reported to vendor
  • 2021-01-29 - Coordinated public release of advisory
CREDIT Anonymous
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