G DATA Total Security Link Following Local Privilege Escalation Vulnerability

April 5th, 2023
ZDI-23-379 ZDI-CAN-18749

CVE ID

CVE-2023-27347

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 G DATA Backup Service. By creating a symbolic link, an attacker can abuse the service to create arbitrary files. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

Additional Details

Fixed in version is 25.5.13.26


Disclosure Timeline

  • 2022-10-26 - Vulnerability reported to vendor
  • 2023-04-05 - Coordinated public release of advisory
  • 2023-12-07 - Advisory Updated

Credit

Dennis Herrmann (@dhn_)

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