Application interruption via FastHufDecoder shift overflow
Published Mar 30, 2021 · Updated Aug 3, 2024
Integer overflow in OpenEXR 2.4.2 and earlier and 2.5.0 through 2.5.3 allows attackers to interrupt applications via crafted EXR files. FastHufDecoder calculates Huffman code-length scaling factors with a 32-bit left shift, so large code-length differences overflow before conversion to double. Any application or service that decodes attacker-controlled EXR input can suffer a service interrupt; no confidentiality or integrity impact is reported.
Summary
What happened
Integer overflow in OpenEXR 2.4.2 and earlier and 2.5.0 through 2.5.3 allows attackers to interrupt applications via crafted EXR files. FastHufDecoder calculates Huffman code-length scaling factors with a 32-bit left shift, so large code-length differences overflow before conversion to double. Any application or service that decodes attacker-controlled EXR input can suffer a service interrupt; no confidentiality or integrity impact is reported.
The record
- CVE
- CVE-2021-3474
- Published
- Mar 30, 2021
- Updated
- Aug 3, 2024
- Vendor
- Academy Software Foundation
- Product
- OpenEXR
- Classifications
- CWE-190, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 30, 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?
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- Affected versionversion=OpenEXR 3.0.0-beta
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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