CVE-2021-37617 Untrusted Search Path in Nextcloud Desktop Client

2021-08-1817:25:10

CWE-426

GitHub_M

www.cve.org

nextcloud

desktop client

untrusted search path

vulnerability

arbitrary code

fixed version

CVSS3

7.3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

AI Score

7.1

Confidence

High

EPSS

Percentile

12.6%

JSON

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud Desktop Client invokes its uninstaller script when being installed to make sure there are no remnants of previous installations. In versions 3.0.3 through 3.2.4, the Client searches the Uninstall.exe file in a folder that can be written by regular users. This could lead to a case where a malicious user creates a malicious Uninstall.exe, which would be executed with administrative privileges on the Nextcloud Desktop Client installation. This issue is fixed in Nextcloud Desktop Client version 3.3.0. As a workaround, do not allow untrusted users to create content in the C:\ system folder and verify that there is no malicious C:\Uninstall.exe file on the system.

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": ">= 3.0.3 , <= 3.2.4"
      }
    ]
  }
]