Application crash via unchecked render buffer sizing
Published Jun 24, 2021 · Updated Aug 3, 2024
Integer overflow in DjVuLibre 3.5.28 and earlier allows context-dependent attackers to crash ddjvu with a crafted DjVu file. The render() function in tools/ddjvu.cpp multiplies rowsize by the render-rectangle height without a size_t overflow check, allocates the wrapped size, and later passes an oversized length to fwrite. Processing the malicious document is required; the demonstrated consequence is a heap-buffer over-read followed by application abort, while broader effects are unspecified.
Summary
What happened
Integer overflow in DjVuLibre 3.5.28 and earlier allows context-dependent attackers to crash ddjvu with a crafted DjVu file. The render() function in tools/ddjvu.cpp multiplies rowsize by the render-rectangle height without a size_t overflow check, allocates the wrapped size, and later passes an oversized length to fwrite. Processing the malicious document is required; the demonstrated consequence is a heap-buffer over-read followed by application abort, while broader effects are unspecified.
The record
- CVE
- CVE-2021-32491
- Published
- Jun 24, 2021
- Updated
- Aug 3, 2024
- Vendor
- DjVuLibre Project
- Product
- DjVuLibre
- Classifications
- CWE-190, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 24, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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=djvulibre-3.5.28 and earlier
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.
Public exploit references
- Crafted DjVu proof-of-concept fileproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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