Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2021-32679

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in controllers using `DownloadResponse`. When a user-supplied filename was passed unsanitized into a `DownloadResponse`, this could be used to trick users into downloading malicious files with a benign file extension. This would show in UI behaviours where Nextcloud applications would display a benign file extension (e.g. JPEG), but the file will actually be downloaded with an executable file extension. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. Administrators of Nextcloud instances do not have a workaround available, but developers of Nextcloud apps may manually escape the file name before passing it into `DownloadResponse`.

Published

2021-07-12T13:15:08.013

Last Modified

2024-11-21T06:07:30.997

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 3.5 (LOW)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

8.6

Impact Score

6.4

Weaknesses
  • Type: Secondary
    CWE-116
  • Type: Primary
    CWE-116
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application nextcloud nextcloud_server < 19.0.13 Yes
Application nextcloud nextcloud_server < 20.0.11 Yes
Application nextcloud nextcloud_server < 21.0.3 Yes
Operating System fedoraproject fedora 33 Yes
Operating System fedoraproject fedora 34 Yes
References