Description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with your computer. In version 3.6.0, if a user received a malicious file share and has it synced locally or the virtual filesystem enabled and clicked a nc://open/ link it will open the default editor for the file type of the shared file, which on Windows can also sometimes mean that a file depending on the type, e.g. "vbs", is being executed. It is recommended that the Nextcloud Desktop client is upgraded to version 3.6.1. As a workaround, users can block the Nextcloud Desktop client 3.6.0 by setting the `minimum.supported.desktop.version` system config to `3.6.1` on the server, so new files designed to use this attack vector are not downloaded anymore. Already existing files can still be used. Another workaround would be to enforce shares to be accepted by setting the `sharing.force_share_accept` system config to `true` on the server, so new files designed to use this attack vector are not downloaded anymore. Already existing shares can still be abused.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nextcloud | security-advisories | = 3.6.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nextcloud-desktop | 3.6.1-1 | — |
| Debian 13 | nextcloud-desktop | 3.6.1-1 | — |
| Debian 12 | nextcloud-desktop | 3.6.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | nextcloud-desktop | No fix yet | — |
| Ubuntu 20.04 LTS | nextcloud-desktop | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nextcloud-client | 3.6.2-r0 | — |
| Alpine v3.23 | nextcloud-client | 3.6.2-r0 | — |
| Alpine v3.22 | nextcloud-client | 3.6.2-r0 | — |
| Alpine v3.21 | nextcloud-client | 3.6.2-r0 | — |
| Alpine v3.20 | nextcloud-client | 3.6.2-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nextcloud-client | 3.6.2-r0 | — |
| Alpine v3.18 | nextcloud-client | 3.6.2-r0 | — |
| Alpine v3.17 | nextcloud-client | 3.6.2-r0 | — |