Code execution via Mini FAT size overflow
Published Aug 5, 2022 · Updated Apr 15, 2025
Integer overflow in ESTsoft ALYac 2.5.8.544 OLE parsing allows local users to execute arbitrary code via a crafted OLE file. The parser multiplies the attacker-controlled Mini FAT sector count by the sector size in 32 bits, then allocates the wrapped result and repeatedly copies full sectors into the undersized heap buffer. Exploitation requires ALYac to scan the file and results in code execution in the affected process.
Summary
What happened
Integer overflow in ESTsoft ALYac 2.5.8.544 OLE parsing allows local users to execute arbitrary code via a crafted OLE file. The parser multiplies the attacker-controlled Mini FAT sector count by the sector size in 32 bits, then allocates the wrapped result and repeatedly copies full sectors into the undersized heap buffer. Exploitation requires ALYac to scan the file and results in code execution in the affected process.
The record
- CVE
- CVE-2022-29886
- Published
- Aug 5, 2022
- Updated
- Apr 15, 2025
- Vendor
- ESTsoft
- Product
- ALYac
- Classifications
- CWE-680, CWE-190, T1203
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 5, 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=2.5.8.544
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
- Crafted OLE Mini FAT overflow demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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