Code execution via pre-sanitization extension checks
Published Jun 19, 2023 · Updated Dec 11, 2024
Filename validation in Firefox before 112, Firefox ESR before 102.10, and Thunderbird before 102.10 allows attackers to execute code via downloads. The Windows download path checked dangerous extensions before SanitizeFileName stripped a trailing newline, leaving the sanitized filename unrenamed. A user must accept and open the crafted download; the bypass removes the extension safeguard but does not itself execute the file.
Summary
What happened
Filename validation in Firefox before 112, Firefox ESR before 102.10, and Thunderbird before 102.10 allows attackers to execute code via downloads. The Windows download path checked dangerous extensions before SanitizeFileName stripped a trailing newline, leaving the sanitized filename unrenamed. A user must accept and open the crafted download; the bypass removes the extension safeguard but does not itself execute the file.
The record
- CVE
- CVE-2023-29542
- Published
- Jun 19, 2023
- Updated
- Dec 11, 2024
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 19, 2023CVE publishedPublication date reported by the CVE source.
- Dec 11, 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 <112
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
- Mozilla Bugzilla poc.html download demonstrationproof 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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