Fixes the following security vulnerabilities:
- CVE-2018-17961: Artifex Ghostscript 9.25 and earlier allows attackers to
bypass a sandbox protection mechanism via vectors involving errorhandler
setup. NOTE: this issue exists because of an incomplete fix for
CVE-2018-17183.
- CVE-2018-18284: Artifex Ghostscript 9.25 and earlier allows attackers to
bypass a sandbox protection mechanism via vectors involving the 1Policy
operator.
- CVE-2018-19409: An issue was discovered in Artifex Ghostscript before
9.26. LockSafetyParams is not checked correctly if another device is
used.
- CVE-2018-19475: psi/zdevice2.c in Artifex Ghostscript before 9.26 allows
remote attackers to bypass intended access restrictions because available
stack space is not checked when the device remains the same.
- CVE-2018-19476: psi/zicc.c in Artifex Ghostscript before 9.26 allows
remote attackers to bypass intended access restrictions because of a
setcolorspace type confusion.
- CVE-2018-19477: psi/zfjbig2.c in Artifex Ghostscript before 9.26 allows
remote attackers to bypass intended access restrictions because of a
JBIG2Decode type confusion.
For more details, see the release notes:
https://www.ghostscript.com/doc/9.26/History9.htm#Version9.26
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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