Malware scan termination via unchecked PE section count
Published May 12, 2022 · Updated Apr 15, 2025
Out-of-bounds read in ESTsoft ALYac 2.5.7.7 allows attackers to crash malware scanning by supplying a malformed PE file. The coen.aym function sub_180086C30 trusts the PE header's NumberOfSections value and iterates 40-byte section headers without checking the file length. The file must reach ALYac's PE scanner; a missing .text section lets the loop read beyond the file and terminate the scanning process.
Summary
What happened
Out-of-bounds read in ESTsoft ALYac 2.5.7.7 allows attackers to crash malware scanning by supplying a malformed PE file. The coen.aym function sub_180086C30 trusts the PE header's NumberOfSections value and iterates 40-byte section headers without checking the file length. The file must reach ALYac's PE scanner; a missing .text section lets the loop read beyond the file and terminate the scanning process.
The record
- CVE
- CVE-2022-21147
- Published
- May 12, 2022
- Updated
- Apr 15, 2025
- Vendor
- ESTsoft
- Product
- ALYac
- Classifications
- CWE-125, CWE-823, T1562.001
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- May 12, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.5.7.7
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
- Cisco Talos malformed PE crash demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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