Code execution via unchecked charset buffer copy
Published May 29, 2024 · Updated Feb 13, 2025
Stack-based buffer overflow in html2xhtml 1.3 allows local users to crash the converter or execute code via crafted HTML input. In read_charset_decl, a loop lowercases input bytes into the fixed-size stack array buf without adequately enforcing its upper bound. A local user must cause the command-line converter to process crafted HTML; the demonstrated result is a segmentation fault, while the corruption also permits code execution.
Summary
What happened
Stack-based buffer overflow in html2xhtml 1.3 allows local users to crash the converter or execute code via crafted HTML input. In read_charset_decl, a loop lowercases input bytes into the fixed-size stack array buf without adequately enforcing its upper bound. A local user must cause the command-line converter to process crafted HTML; the demonstrated result is a segmentation fault, while the corruption also permits code execution.
The record
- CVE
- CVE-2024-35333
- Published
- May 29, 2024
- Updated
- Feb 13, 2025
- Vendor
- html2xhtml Project
- Product
- html2xhtml
- Classifications
- CWE-121, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 29, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.3
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
- CVE-2024-35333 proof-of-concept HTMLproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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