Advisory Details

August 30th, 2021

(0Day) Fuji Electric Tellus Lite V9 File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-21-1038
ZDI-CAN-13253

CVE ID
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 Tellus Lite
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Fuji Electric Tellus 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 V9 files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. 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.

03/26/21 – ZDI reported the vulnerabilities to ICS-CERT
03/31/21 – ICS-CERT acknowledged the reports
08/04/21 – ZDI requested an update
08/19/21 – ZDI requested an update
08/19/21 – ICS-CERT indicated the fix was scheduled for October
08/19/21 – ZDI notified ICS-CERT of the intention to publish the cases as 0-day advisories on 08/30/21

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


DISCLOSURE TIMELINE
  • 2021-03-26 - Vulnerability reported to vendor
  • 2021-08-30 - Coordinated public release of advisory
CREDIT kimiya
BACK TO ADVISORIES