PT-2017-12719 · Des · Deslock+

Published 2017-08-28 · Updated 2017-09-08 · CVE-2017-12840

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions DESLock+ client application versions 4.8.16 and earlier

Description The issue arises from a locally exploitable heap-based buffer overflow in the DLMFENC.sys kernel driver. This occurs when handling an IOCTL message of type 0x0FA4204, due to insufficient memory allocation on the kernel heap for a user-supplied string. The string is copied into a constant size buffer (0x1000 bytes), resulting in an overflow condition. Access to the kernel driver is possible through an obfuscated interface, where user-supplied message bytes are "authenticated" using an obfuscation routine with a linear equation.

Recommendations For DESLock+ client application versions 4.8.16 and earlier, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2017-12840

Affected Products

Deslock+

References · 3

• https://osv.dev/vulnerability/CVE-2017-12840 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-12840 · Security Note
• https://trustwave.com/Resources/Security-Advisories/Advisories/TWSL2017-016/?fid=9946 · Note