CVE-2020-27771: debian debian_linux Integer Overflow or Wraparound

Vulnerability summary

CVE-2020-27771 is a medium (CVSS 4.3) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 1.18% chance of exploitation in the next 30 days, higher than 67% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 04-12-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.