Vulnerability Details : CVE-2020-27771
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.
Vulnerability category: Overflow
Products affected by CVE-2020-27771
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
- cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:*
- cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-27771
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 32 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-27771
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:N/A:P |
8.6
|
2.9
|
NIST | |
|
3.3
|
LOW | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
1.8
|
1.4
|
NIST |
CWE ids for CVE-2020-27771
-
The 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.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2020-27771
-
https://bugzilla.redhat.com/show_bug.cgi?id=1898290
1898290 – (CVE-2020-27771) CVE-2020-27771 ImageMagick: outside the range of representable values of type 'unsigned char' at coders/pdf.cExploit;Issue Tracking;Patch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html
[SECURITY] [DLA 3357-1] imagemagick security update
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00030.html
[SECURITY] [DLA 2602-1] imagemagick security updateMailing List;Third Party Advisory
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