Schneider Electric Wonderware InduSoft Web Studio 8.0 Patch 3 Insecure Permissions Vulnerability

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

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AFFECTED PRODUCTS
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The following versions of Schneider Electricas Wondeware InduSoft Web
Studio are affected:

Wonderware InduSoft Web Studio v8.0 Patch 3 and prior versions.

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IMPACT
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Successful exploitation of this vulnerability could allow an authenticated
user to escalate his or her privileges.

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VULNERABILITY OVERVIEW
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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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