Data exposure and update tampering via validation failures
Published Aug 5, 2021 · Updated Aug 3, 2024
Multiple security flaws in Mozilla VPN before 2.3 allow remote attackers to expose data, disrupt login, or tamper with updates. The grouped findings include incomplete update-certificate validation, an unauthenticated localhost WebSocket, an unprotected OAuth callback listener, verbose API errors, and a ping race outside the tunnel. Exploitation depends on the individual flaw and can require a malicious website, local reachability, a trusted certificate authority, authentication, or precise timing.
Summary
What happened
Multiple security flaws in Mozilla VPN before 2.3 allow remote attackers to expose data, disrupt login, or tamper with updates. The grouped findings include incomplete update-certificate validation, an unauthenticated localhost WebSocket, an unprotected OAuth callback listener, verbose API errors, and a ping race outside the tunnel. Exploitation depends on the individual flaw and can require a malicious website, local reachability, a trusted certificate authority, authentication, or precise timing.
The record
- CVE
- CVE-2021-29978
- Published
- Aug 5, 2021
- Updated
- Aug 3, 2024
- Vendor
- Mozilla
- Product
- Mozilla VPN
- Classifications
- T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <2.3
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.
Weakness, pattern, technique
Public exploit references
- Cross-site WebSocket hijacking proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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