High memory usage for generating preview of broken image

Low

nickvergessen published GHSA-jf3h-xf4q-mh89

Mar 9, 2022

Package

Server (Nextcloud)

Affected versions

< 21.0.8 , < 22.2.4, < 23.0.1

Patched versions

21.0.8 , 22.2.4, 23.0.1

Description

Impact

An attacker can cause a denial of service by uploading specially crafted files which will cause the server to allocate too much memory / CPU.

Patches

It is recommended that the Nextcloud Server is upgraded to 21.0.8 , 22.2.4 or 23.0.1.

Workarounds

Disable preview generation with the 'enable_previews' config flag.

References

For more information

If you have any questions or comments about this advisory:

Create a post in nextcloud/security-advisories
Customers: Open a support ticket at support.nextcloud.com

Severity

Low

3.5

/ 10

CVSS base metrics

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

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