Provider registration manipulation via accepted invalid certificates
Published Jun 11, 2021 · Updated Aug 3, 2024
Improper certificate validation in Nextcloud Desktop Client before 3.3.1 allows man-in-the-middle attackers to alter provider-registration traffic. WebEnginePage::certificateError returned success for CertificateAuthorityInvalid when the certificate host matched the registration page's root host, causing QWebEngine to continue despite an untrusted issuer. Exploitation requires a network interception position during the Register with a Provider flow and permits modification of that registration session.
Summary
What happened
Improper certificate validation in Nextcloud Desktop Client before 3.3.1 allows man-in-the-middle attackers to alter provider-registration traffic. WebEnginePage::certificateError returned success for CertificateAuthorityInvalid when the certificate host matched the registration page's root host, causing QWebEngine to continue despite an untrusted issuer. Exploitation requires a network interception position during the Register with a Provider flow and permits modification of that registration session.
The record
- CVE
- CVE-2021-22895
- Published
- Jun 11, 2021
- Updated
- Aug 3, 2024
- Vendor
- Nextcloud GmbH
- Product
- Nextcloud Desktop Client
- Classifications
- CWE-295, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 11, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=Fixed in 3.3.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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