Advisory Details

March 11th, 2021

Siemens Solid Edge Viewer PAR File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability

ZDI-21-270
ZDI-CAN-12534

CVE ID CVE-2021-27381
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 disclose sensitive information 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 PAR 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 arbitrary code in the context of the current process.

ADDITIONAL DETAILS Siemens has issued an update to correct this vulnerability. More details can be found at:
https://us-cert.cisa.gov/ics/advisories/icsa-21-068-09
DISCLOSURE TIMELINE
  • 2021-01-15 - Vulnerability reported to vendor
  • 2021-03-11 - Coordinated public release of advisory
  • 2021-03-12 - Advisory Updated
CREDIT Francis Provencher {PRL}
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