Advisory Details

September 29th, 2023

G DATA Total Security GDBackupSvc Service Link Following Local Privilege Escalation Vulnerability

ZDI-23-1493
ZDI-CAN-20694

CVE ID CVE-2023-42126
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS G DATA
AFFECTED PRODUCTS Total Security
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of G Data Total Security. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the GDBackupSvc service. By creating a symbolic link, an attacker can abuse the service to create a file with a permissive DACL. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS

Fixed in version 25.5.16.125


DISCLOSURE TIMELINE
  • 2023-04-28 - Vulnerability reported to vendor
  • 2023-09-29 - Coordinated public release of advisory
  • 2023-12-07 - Advisory Updated
CREDIT Filip Dragovic (@filip_dragovic)
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