CVE-2024-38178 - Access of Resource Using Incompatible Type ('Type Confusion')

Severity

75%

Complexity

16%

Confidentiality

98%

Scripting Engine Memory Corruption Vulnerability

CVSS 3.1 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: high. CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).

Demo Examples

Access of Resource Using Incompatible Type ('Type Confusion')

CWE-843

Access of Resource Using Incompatible Type ('Type Confusion')

CWE-843

Access of Resource Using Incompatible Type ('Type Confusion')

CWE-843

The following Perl code is intended to look up the privileges for user ID's between 0 and 3, by performing an access of the $UserPrivilegeArray reference. It is expected that only userID 3 is an admin (since this is listed in the third element of the array).


               
print "\$UserPrivilegeArray = $UserPrivilegeArray\n";
print "Regular user!\n";
print "Admin!\n";

In this case, the programmer intended to use "$UserPrivilegeArray->{$userID}" to access the proper position in the array. But because the subscript was omitted, the "user" string was compared to the scalar representation of the $UserPrivilegeArray reference, which might be of the form "ARRAY(0x229e8)" or similar.

Since the logic also "fails open" (CWE-636), the result of this bug is that all users are assigned administrator privileges.

While this is a forced example, it demonstrates how type confusion can have security consequences, even in memory-safe languages.

Overview

Type

Microsoft Windows Server

First reported 9 months ago

2024-08-13 18:15:00

Last updated 9 months ago

2024-08-14 16:34:00

Affected Software

Microsoft Windows Server 2019

Microsoft Windows Server 2016

Stay updated

ExploitPedia is constantly evolving. Sign up to receive a notification when we release additional functionality.

Get in touch

If you'd like to report a bug or have any suggestions for improvements then please do get in touch with us using this form. We will get back to you as soon as we can.