Advisory Details

May 12th, 2021

(0Day) Siemens Solid Edge Viewer CATPart File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

ZDI-21-563
ZDI-CAN-11950

CVE ID CVE-2021-27488
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Siemens
AFFECTED PRODUCTS Solid Edge Viewer
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Siemens Solid Edge Viewer. 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 CATPart files. The issue results from the lack of proper validation of user-supplied data, which can result in a write 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.

10/21/20 - ZDI reported the vulnerabilities to ICS-CERT
10/22/20 - ICS-CERT confirmed receipt of the reports
11/23/20 - ICS-CERT communicated that the issue is in a third-party component
02/24/21 - ZDI requested an update
02/25/21 - ICS-CERT confirmed that the vendor was working on a fix
03/18/21 - ZDI requested an update
03/18/21 - ICS-CERT requested an extension
03/22/21 - ZDI agreed to an extension until 04/13/21
04/14/21 - ZDI requested an update
04/27/21 - ZDI requested an update
05/03/21 - ICS-CERT requested an extension until 05/25/21
05/04/21 - ZDI notified ICS-CERT of the intention to publish these reports as 0-day advisories on 05/12/21

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


DISCLOSURE TIMELINE
  • 2020-10-21 - Vulnerability reported to vendor
  • 2021-05-12 - Coordinated public release of advisory
CREDIT rgod
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