PT-2021-4939 · Microsoft+1 · Windows+1

Yuri Kramarz · Published 2021-08-23 · Updated 2022-10-05 · CVE-2021-21912

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Advantech R-SeeNet version 2.4.15

Description A privilege escalation issue exists in the Windows version of Advantech R-SeeNet, related to insufficient access control to the directory C:R-SeeNet. This can allow an attacker to elevate their privileges to NT SYSTEM authority by replacing a specially-crafted file in the system.

Recommendations For Advantech R-SeeNet version 2.4.15, consider restricting access to the directory C:R-SeeNet to minimize the risk of exploitation until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

BDU:2021-05685

CVE-2021-21912

Affected Products

Advantech R-Seenet

Windows

References · 8

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2021-1360 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-21912 · Security Note
• https://safe-surf.ru/upload/VULN/VULN-20211124.3.pdf · Security Note
• https://osv.dev/vulnerability/CVE-2021-21912 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05685 · Security Note
• https://t.me/cibsecurity/34542 · Telegram Post
• https://securitylab.ru/vulnerability/526790.php · Note
• https://cybersecurity-help.cz/vdb/SB2021112314 · Note