Schneider Electric Wonderware InduSoft Web Studio 8.0 Patch 3 Insecure Permissions

2017.07.02
Credit: Karn Ganeshen
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-276


CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Vendor: Schneider Electric Equipment: Wonderware InduSoft Web Studio Vulnerability: Incorrect Default Permissions Advisory URL: https://ipositivesecurity.com/2017/05/19/ics-schneider-electric-wonderware-indusoft-web-studio-privilege-escalation/ ICS-CERT Advisory https://ics-cert.us-cert.gov/advisories/ICSA-17-138-02 ------------------------ AFFECTED PRODUCTS ------------------------ The following versions of Schneider Electricas Wondeware InduSoft Web Studio are affected: Wonderware InduSoft Web Studio v8.0 Patch 3 and prior versions. ------------------------ IMPACT ------------------------ Successful exploitation of this vulnerability could allow an authenticated user to escalate his or her privileges. ------------------------ VULNERABILITY OVERVIEW ------------------------ INCORRECT DEFAULT PERMISSIONS CWE-276 Upon installation, Wonderware InduSoft Web Studio creates a new directory and two files, which are placed in the systemas path and can be manipulated by non-administrators. This could allow an authenticated user to escalate his or her privileges. The directory and files are added to systemas PATH. Therefore, the following can be manipulated by non-administrator users: aC/ File C:\Bin\x86\aahClientManaged.dll has weak permissions: ALLOW NT AUTHORITY\Authenticated Users: FILE_WRITE_DATA FILE_APPEND_DATA DELETE aC/ File C:\Bin\x86\ has weak permissions: ALLOW NT AUTHORITY\Authenticated Users: FILE_ADD_FILE FILE_ADD_SUBDIRECTORY FILE_WRITE_EA FILE_WRITE_ATTRIBUTES DELETE CVE-2017-7968 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H). +++++


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