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It was discovered that the ghostscript /invalidaccess checks fail under certain conditions. An attacker could possibly exploit this to bypass the -dSAFER protection and, for example, execute arbitrary shell commands via a specially crafted PostScript document. It was found that the superexec operator was available in the internal dictionary in ghostscript before 9.27. A specially crafted PostScript file could use this flaw in order to, for example, have access to the file system outside of the constrains imposed by -dSAFER. It was found that the forceput operator could be extracted from the DefineResource method in ghostscript before 9.27. A specially crafted PostScript file could use this flaw in order to, for example, have access to the file system outside of the constrains imposed by -dSAFER. References: https://nvd.nist.gov/vuln/detail/CVE-2019-6116 https://www.openwall.com/lists/oss-security/2019/01/23/5 https://nvd.nist.gov/vuln/detail/CVE-2019-3835 https://nvd.nist.gov/vuln/detail/CVE-2019-3838 Upstream patches: http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=13b0a36 http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2db98f9 http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=99f1309 http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=59d8f4d http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2768d1a http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=49c8092 http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2ff600a http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=779664d http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=e8acf6d http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2055917 http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=d683d1e http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=ed9fcd9 http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a82601e (From OE-Core rev: 12e140dfdac8456772223c816e37bd869419bb18) (From OE-Core rev: cf5d29dcac6247e8476f7af78b4e0bb129b94677) Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> [Fix for CVE-2019-6116 is already in thud, so that has been removed] Signed-off-by: Anuj Mittal <anuj.mittal@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>