HTTPS iframe interception via missing secure-context check
Published Jan 7, 2021 · Updated Aug 4, 2024
Security-policy bypass in Mozilla Firefox before 84 allows remote attackers to alter HTTPS iframe content via an insecure HTTP parent. The DOM service-worker interception path treated the framed HTTPS client as controllable without first enforcing its secure-context status. Exploitation requires a registered service worker for the HTTPS origin, an HTTPS iframe embedded by an insecure HTTP document, and user interaction with attacker-controlled content.
Summary
What happened
Security-policy bypass in Mozilla Firefox before 84 allows remote attackers to alter HTTPS iframe content via an insecure HTTP parent. The DOM service-worker interception path treated the framed HTTPS client as controllable without first enforcing its secure-context status. Exploitation requires a registered service worker for the HTTPS origin, an HTTPS iframe embedded by an insecure HTTP document, and user interaction with attacker-controlled content.
The record
- CVE
- CVE-2020-26976
- Published
- Jan 7, 2021
- Updated
- Aug 4, 2024
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 7, 2021CVE 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 <84
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
No sourced classifications are available.
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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