Cross-origin image disclosure via stale canvas cache
Published Jun 11, 2024 · Updated Aug 1, 2024
Cross-origin data exposure in Firefox before 127, Firefox ESR before 115.12, and Thunderbird before 115.12 allows remote attackers to read image data. CanvasImageCache used a null HTMLCanvasElement pointer as an OffscreenCanvas cache key, so another canvas reused a cached image without inheriting its cross-origin taint. Exploitation requires crafted web content and user interaction; successful access exposes cross-origin image pixels without permitting modification or service interruption.
Summary
What happened
Cross-origin data exposure in Firefox before 127, Firefox ESR before 115.12, and Thunderbird before 115.12 allows remote attackers to read image data. CanvasImageCache used a null HTMLCanvasElement pointer as an OffscreenCanvas cache key, so another canvas reused a cached image without inheriting its cross-origin taint. Exploitation requires crafted web content and user interaction; successful access exposes cross-origin image pixels without permitting modification or service interruption.
The record
- CVE
- CVE-2024-5693
- Published
- Jun 11, 2024
- Updated
- Aug 1, 2024
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-829, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 11, 2024CVE publishedPublication date reported by the CVE source.
- Aug 1, 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=0 <127
- Affected versionversion=unspecified <127
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- OffscreenCanvas taint-bypass video proof of conceptproof 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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