Vulnerability Details CVE-2021-32727
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 38.5%
CVSS Severity
CVSS v3 Score 5.7
CVSS v2 Score 5.0
References
- https://github.com/nextcloud/android/pull/8438
- https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736
- https://hackerone.com/reports/1189162
- https://github.com/nextcloud/android/pull/8438
- https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736
- https://hackerone.com/reports/1189162
Products affected by CVE-2021-32727
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cpe:2.3:a:nextcloud:nextcloud:1.0.0
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cpe:2.3:a:nextcloud:nextcloud:1.0.1
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cpe:2.3:a:nextcloud:nextcloud:1.1.0
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cpe:2.3:a:nextcloud:nextcloud:1.2.0
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cpe:2.3:a:nextcloud:nextcloud:1.3.0
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cpe:2.3:a:nextcloud:nextcloud:1.3.1
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cpe:2.3:a:nextcloud:nextcloud:1.4.0
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cpe:2.3:a:nextcloud:nextcloud:1.4.1
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cpe:2.3:a:nextcloud:nextcloud:1.4.2
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cpe:2.3:a:nextcloud:nextcloud:1.4.3
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cpe:2.3:a:nextcloud:nextcloud:2.0.0
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cpe:2.3:a:nextcloud:nextcloud:2.0.1
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cpe:2.3:a:nextcloud:nextcloud:3.0.0
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cpe:2.3:a:nextcloud:nextcloud:3.0.1
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cpe:2.3:a:nextcloud:nextcloud:3.0.2
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cpe:2.3:a:nextcloud:nextcloud:3.0.3
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cpe:2.3:a:nextcloud:nextcloud:3.1.0
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cpe:2.3:a:nextcloud:nextcloud:3.10.0
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cpe:2.3:a:nextcloud:nextcloud:3.15.1
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cpe:2.3:a:nextcloud:nextcloud:3.16.0
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cpe:2.3:a:nextcloud:nextcloud:3.2.0
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cpe:2.3:a:nextcloud:nextcloud:3.2.1
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cpe:2.3:a:nextcloud:nextcloud:3.2.2
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cpe:2.3:a:nextcloud:nextcloud:3.2.3
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cpe:2.3:a:nextcloud:nextcloud:3.2.4
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cpe:2.3:a:nextcloud:nextcloud:3.3.0
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cpe:2.3:a:nextcloud:nextcloud:3.3.1
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cpe:2.3:a:nextcloud:nextcloud:3.3.2
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cpe:2.3:a:nextcloud:nextcloud:3.4.0
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cpe:2.3:a:nextcloud:nextcloud:3.4.1
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cpe:2.3:a:nextcloud:nextcloud:3.4.2
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cpe:2.3:a:nextcloud:nextcloud:3.5.0
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cpe:2.3:a:nextcloud:nextcloud:3.5.1
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cpe:2.3:a:nextcloud:nextcloud:3.6.0
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cpe:2.3:a:nextcloud:nextcloud:3.6.1
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cpe:2.3:a:nextcloud:nextcloud:3.6.2
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cpe:2.3:a:nextcloud:nextcloud:3.7.0
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cpe:2.3:a:nextcloud:nextcloud:3.7.1
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cpe:2.3:a:nextcloud:nextcloud:3.9.0
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cpe:2.3:a:nextcloud:nextcloud:3.9.1
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cpe:2.3:a:nextcloud:nextcloud:3.9.2