Code execution via unchecked SGI copy size
Published Mar 31, 2021 · Updated Aug 3, 2024
Out-of-bounds write in Accusoft ImageGear 19.8 allows attackers to corrupt heap memory by supplying a malformed SGI file. The SGI parser uses the header's XSIZE value directly for allocation, then accepts a second file-controlled length for memcpy without bounds checking. Exploitation requires a host application to parse the supplied image; successful corruption crashes that process or executes code in its context.
Summary
What happened
Out-of-bounds write in Accusoft ImageGear 19.8 allows attackers to corrupt heap memory by supplying a malformed SGI file. The SGI parser uses the header's XSIZE value directly for allocation, then accepts a second file-controlled length for memcpy without bounds checking. Exploitation requires a host application to parse the supplied image; successful corruption crashes that process or executes code in its context.
The record
- CVE
- CVE-2021-21782
- Published
- Mar 31, 2021
- Updated
- Aug 3, 2024
- Vendor
- Accusoft
- Product
- ImageGear
- Classifications
- CWE-131, CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 31, 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=Accusoft ImageGear Accusoft ImageGear 19.8
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 SGI trigger analysisproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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