CVE-2021-32727
Nextcloud Android Client Remote Key Compromise Vulnerability
Description
Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.
INFO
Published Date :
July 12, 2021, 9:15 p.m.
Last Modified :
Nov. 21, 2024, 6:07 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Affected Products
The following products are affected by CVE-2021-32727
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32727.
| URL | Resource |
|---|---|
| https://github.com/nextcloud/android/pull/8438 | Third Party Advisory |
| https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices | Third Party Advisory |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736 | Third Party Advisory |
| https://hackerone.com/reports/1189162 | Permissions Required |
| https://github.com/nextcloud/android/pull/8438 | Third Party Advisory |
| https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices | Third Party Advisory |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736 | Third Party Advisory |
| https://hackerone.com/reports/1189162 | Permissions Required |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-32727 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32727 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/nextcloud/android/pull/8438 Added Reference https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices Added Reference https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736 Added Reference https://hackerone.com/reports/1189162 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jul. 14, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://github.com/nextcloud/android/pull/8438 No Types Assigned https://github.com/nextcloud/android/pull/8438 Third Party Advisory Changed Reference Type https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices No Types Assigned https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices Third Party Advisory Changed Reference Type https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736 No Types Assigned https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736 Third Party Advisory Changed Reference Type https://hackerone.com/reports/1189162 No Types Assigned https://hackerone.com/reports/1189162 Permissions Required Added CWE NIST CWE-295 Added CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:android:*:* versions up to (excluding) 3.16.1
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32727 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32727
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.20 }} 0.05%
score
0.57260
percentile