CVE-2023-29000 Nextcloud Desktop client does not verify received singed certificate in end-to-end encryption
A malicious server can trick the Nextcloud Desktop Client into encrypting files with an attacker-controlled key, bypassing end-to-end encryption security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-29000?
CVE-2023-29000 is a medium-severity vulnerability in nextcloud security-advisories, published on 4 Apr 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.7.0, by trusting that the server will return a certificate that belongs to the keypair of the user, a malicious server could get the desktop client to encrypt files with a key known to the attacker. This issue is fixed in Nextcloud Desktop 3.7.0. No known workarounds are available.
Weakness: CWE-295
Which versions are affected by CVE-2023-29000?
It affects 1 product.
Products include Nextcloud Desktop.
How do I fix CVE-2023-29000?
Upgrade to a fixed version.
Is CVE-2023-29000 being exploited?
There is no known exploitation of CVE-2023-29000 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
- CVE-2024-46958 Misconfiguration in n/a
- CVE-2020-8224 Code injection in Desktop Client
- CVE-2020-8225 Information disclosure in Desktop Client
- CVE-2021-37617 Untrusted Search Path in Nextcloud Desktop Client
- CVE-2023-28999 Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
Sources
Also known as DEBIAN-CVE-2023-29000, GHSA-h82x-98q3-7534, UBUNTU-CVE-2023-29000.