Integer Overflow or Wraparound

Affecting imagemagick package, versions <8:6.9.7.4+dfsg-11+deb9u12

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Overview

Affected versions of this package are vulnerable to Integer Overflow or Wraparound. In RestoreMSCWarning() of /coders/pdf.c there are several areas where calls to GetPixelIndex() could result in values outside the range of representable for the unsigned char type. The patch casts the return value of GetPixelIndex() to ssize_t type to avoid this bug. This undefined behavior could be triggered when ImageMagick processes a crafted pdf file. Red Hat Product Security marked this as Low severity because although it could potentially lead to an impact to application availability, no specific impact was demonstrated in this case. This flaw affects ImageMagick versions prior to 7.0.9-0.

Remediation

Upgrade imagemagick to version 8:6.9.7.4+dfsg-11+deb9u12 or higher.

References

CVSS Score

3.3
low severity
  • Attack Vector
    Local
  • Attack Complexity
    Low
  • Privileges Required
    None
  • User Interaction
    Required
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    None
  • Availability
    Low
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVE
CVE-2020-27771
CWE
CWE-190
Snyk ID
SNYK-DEBIAN9-IMAGEMAGICK-1045701
Disclosed
04 Dec, 2020
Published
26 Nov, 2020