CVE-2025-62171: ImageMagick has Integer Overflow in BMP Decoder (ReadBMP)

CVE-2025-57803 claims to be patched in ImageMagick 7.1.2-2, but the fix is incomplete and ineffective. The latest version 7.1.2-5 remains vulnerable to the same integer overflow attack.

The patch added BMPOverflowCheck() but placed it after the overflow occurs, making it useless. A malicious 58-byte BMP file can trigger AddressSanitizer crashes and DoS.

Affected Versions:

• ImageMagick < 7.1.2-2 (originally reported)
• ImageMagick 7.1.2-2 through 7.1.2-5 (incomplete patch)

Platform and Configuration Requirements:

• 32-bit systems ONLY (i386, i686, armv7l, etc.)
• Requires size_t = 4 bytes. (64-bit systems are NOT vulnerable (size_t = 8 bytes))
• Requires modified resource limits: The default width, height, and area limits must have been manually increased (Systems using default ImageMagick resource limits are NOT vulnerable).