CVE ID: CVE-2025-57807
Severity: Low (CVSS 3.8), but potential for high-impact RCE
Reported by: Lumina Mescuwa
Fixed in: ImageMagick version 14.8.2
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1. Vulnerability Overview
ImageMagick, a core image-processing library, contains a flaw in its BlobStream subsystem (MagickCore/blob.c). The vulnerability stems from improper handling of stream offsets:
- SeekBlob() allows seeking past the end of the buffer without resizing.
- WriteBlob() then resizes solely based on
quantum + length, not considering the advanced offset, causing the data to be written beyond memory bounds.
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This deterministic out-of-bounds write allows an attacker-controlled write at a precise offset—an advanced primitive that can be weaponized for exploit development.
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2. Technical Impact & Classification
| Attribute | Assessment |
|---|---|
| Crash Potential | High (reliable memory corruption) |
| RCE Feasibility | High (in long-running contexts like imaging services) |
| Attack Vector | Local only (requires local file write capability) |
| Preconditions | High privilege, user interaction, local access |
| CVSS Score | 3.8 (Low severity) (AV:L/AC:H/PR:H/UI:R/…) |
| PoC Availability | Yes — publicly released by Lumina Mescuwa |
| Exploit Automatability | No — manual setup required |
| wiz.iocvefeed.ioDaily CyberSecurity |
3. Proof-of-Concept Scenario
A straightforward PoC can be constructed by:
- Creating a memory-backed BlobStream with
extent = 1. - Writing one byte, then seeking to an offset far beyond (e.g.,
0x10000000, 256 MiB). - Performing a write of a few bytes causes memory corruption.
Example used by researcher proves deterministic nature of the overflow.
Daily CyberSecuritymiggo.io
CISA has marked this PoC as non-automatable but reliably exploitable (SSVC metrics).
NVD
4. Affected Scope
- ImageMagick versions < 14.8.2 across platforms (Linux, macOS, Windows).
- Affects direct usage of BlobStreams in memory (Q16-HDRI, etc.) and any third-party tools that pass arbitrary offsets.
Multiple vulnerability scanners (e.g., Nessus) have added detection with severity marked as Low, tabulating risk for unpatched systems.
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5. Technical Root Cause Analysis
The flaw arises from a contract mismatch between:
SeekBlob()which allows overshooting the buffer without resizing.WriteBlob()which only ensuresextent += quantum + length, notoffset + length, leading to out-of-bounds write.
Fix involves modifying WriteBlob() to validate extent >= offset + length, resizing correctly before write.
6. PoC: Code Environment Setup (High-Level)
- Build ImageMagick v7.1.2-0 with Address Sanitizer (ASan).
- Write a minimal C program using
MagickCoreGenesis()and internal headers to test forward-seek then write. - Observe heap OOB write or crash.
Detailed reproduction can be provided on request.
7. Mitigation & Remediation
- Immediate fix: upgrade to ImageMagick 14.8.2 or later.
- For build environments unable to upgrade:
- Use file-backed streams, not BlobStreams.
- Add manual buffer size checks for forward-seeks.
8. Strategic Recommendations & Defense Stack
- WDATM / Enterprise scanning: flag ImageMagick versions <14.8.2.
- EDR/XDR integration: monitor crashes and anomalous memory behavior in image processing sub-services.
- Build enforcement: enforce strict version control in CI pipelines.
Affiliate suggestions:
9. CyberDudeBivash Technical Executive Take
- While the CVSS score is low, the flaw offers a reliable exploit primitive—perfect for stealth attackers targeting complex services hosting ImageMagick (e.g., image-hosting servers).
- This should elevate threat responses and justify patch investment.
- Our lab recommends aggressive patching and artifact scans in container-heavy deployments and microservices relying on ImageMagick.
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