Out-of-bounds write via PRE-node tab expansion
Published Oct 24, 2024 · Updated Oct 25, 2024
Buffer overflow in HTMLDOC 1.9.18 allows context-dependent attackers to write past a buffer while converting crafted HTML PRE nodes. The parse_pre loop leaves room for only one byte at the end of its fixed line buffer, while one tab can append up to eight spaces past that limit. Reachability requires HTMLDOC to process attacker-controlled HTML; the published reproducer demonstrates the overflow only under AddressSanitizer, and code execution is not demonstrated.
Summary
What happened
Buffer overflow in HTMLDOC 1.9.18 allows context-dependent attackers to write past a buffer while converting crafted HTML PRE nodes. The parse_pre loop leaves room for only one byte at the end of its fixed line buffer, while one tab can append up to eight spaces past that limit. Reachability requires HTMLDOC to process attacker-controlled HTML; the published reproducer demonstrates the overflow only under AddressSanitizer, and code execution is not demonstrated.
The record
- CVE
- CVE-2024-46478
- Published
- Oct 24, 2024
- Updated
- Oct 25, 2024
- Vendor
- HTMLDOC Project
- Product
- HTMLDOC
- Classifications
- CWE-120
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 24, 2024CVE publishedPublication date reported by the CVE source.
- Oct 25, 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=1.9.18
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
- poc2.zip HTML tab-overflow reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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