3.3

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3.1

-

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GHSA-8vfj-q2cp-5m5j

GHSA-8vfj-q2cp-5m5j: ImageMagick has a heap buffer overflow read in magnify operation via unrecognized magnify:method value

An unrecognized magnify:method will result in an out of bounds read in the magnify operation.

==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61a000000b30
READ of size 4 at 0x61a000000b30 thread T0

(GitHub Advisory)

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GHSA-8vfj-q2cp-5m5j

GHSA-8vfj-q2cp-5m5j:

3.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Magick.NET-Q16-AnyCPU	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-AnyCPU	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-OpenMP-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-x86	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-OpenMP-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-OpenMP-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-x86	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-OpenMP-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-AnyCPU	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-OpenMP-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-OpenMP-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-x86	nuget	< 14.12.0	14.12.0

Technical Details

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Miggo AI

Root Cause Analysis

The vulnerability, identified as GHSA-8vfj-q2cp-5m5j, is a heap-based buffer overflow in the MagnifyImage function within ImageMagick's MagickCore/resize.c. The advisory points to a flaw where an unrecognized magnify:method value leads to an out-of-bounds read. Analysis of the patch commit, 8f6b59383ce65d839ad3e2aa578d5d7a7dd1d0ec, reveals a change in the initialization of local variables magnification and width inside the MagnifyImage function. Before the patch, these were initialized to 1. If the user-supplied magnify:method was not matched in the subsequent switch statement, these unsafe default values would be used, causing a buffer over-read. The fix was to change the default initialization to magnification=2 and width=3, which are safe values corresponding to a valid magnification method (scale2x). Therefore, any runtime profile during exploitation would show the MagnifyImage function as the primary vulnerable component.

Vulnerable functions

MagnifyImage

MagickCore/resize.c

The vulnerability exists in the `MagnifyImage` function. If an unrecognized `magnify:method` is supplied by the user, the function does not enter any of the `case` statements in the `switch` block. Before the patch, the variables `magnification` and `width` were initialized to 1. These values were then used in subsequent calculations, leading to an out-of-bounds read. The patch changes these default values to 2 and 3, which prevents the memory access error.

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WAF Rule

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Reasoning

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