CVE-2021-32614
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA flaw was found in dmg2img through 20170502. fill_mishblk() does not check the length of the read buffer, and copy 0xCC bytes from it. The length of the buffer is controlled by an attacker. By providing a length smaller than 0xCC, memcpy reaches out of the malloc'ed bound. This possibly leads to memory layout information leaking in the data. This might be used in a chain of vulnerability in order to reach code execution.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidencedmg2img versions through 20170502 contain a heap-based buffer over-read in fill_mishblk(). The function copies 0xCC bytes via memcpy without validating the read buffer length first. When an attacker-supplied length is smaller than 0xCC, the memcpy reads beyond the allocated buffer boundary, potentially leaking heap memory layout information that could aid in exploiting other vulnerabilities for code execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 20170502CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify dmg2img is installedRun 'which dmg2img' or 'where dmg2img' to locate the binaryAffected if dmg2img is not found on the system, the vulnerability does not apply
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Determine the installed dmg2img versionRun 'dmg2img --version' or check the binary's metadata for the build date/version stringAffected if The version displayed is 20170502 or earlier (versions through 20170502 are affected)
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Confirm the vulnerable function is reachableThe vulnerability is in the fill_mishblk() function which processes DMG file headers. When converting a DMG file, this function is invoked to handle mishblk data blocks.Affected if The tool processes DMG files using the affected code path (fill_mishblk is called during DMG conversion)
You are affected if dmg2img version 20170502 or earlier is installed and you use it to process DMG files, since the heap buffer over-read in fill_mishblk() occurs when the attacker-supplied length is smaller than 0xCC bytes.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpdate dmg2img to a version after 20170502 that includes proper bounds checking in fill_mishblk() to validate buffer length is >= 0xCC before performing the memcpy, or apply a patch that adds this validation.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-32614 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-32614 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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