Account access via unchecked OAuth redirect URI
Published Apr 24, 2020 · Updated Aug 4, 2024
Missing authorization in Mozilla Firefox before 75 allows attackers to access service-provider accounts through a malicious extension. The browser.identity.launchWebAuthFlow API resolves its Promise with a redirect URL containing an authorization code even when the supplied redirect URI is not owned by the calling extension. Exploitation requires a malicious extension, a known registered OAuth redirect URI, and successful user authentication; the exposed code grants access to the account at that service provider.
Summary
What happened
Missing authorization in Mozilla Firefox before 75 allows attackers to access service-provider accounts through a malicious extension. The browser.identity.launchWebAuthFlow API resolves its Promise with a redirect URL containing an authorization code even when the supplied redirect URI is not owned by the calling extension. Exploitation requires a malicious extension, a known registered OAuth redirect URI, and successful user authentication; the exposed code grants access to the account at that service provider.
The record
- CVE
- CVE-2020-6823
- Published
- Apr 24, 2020
- Updated
- Aug 4, 2024
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-862, T1528
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 24, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 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 <75
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
- Mozilla Bugzilla OAuth authorization-code reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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