ghostscript: Fix 3 CVEs
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
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
