ghostscript: CVE-2016-7977, CVE-2016-7978, CVE-2016-7979, CVE-2017-9216

Ghostscript before 9.21 might allow remote attackers to bypass the SAFER
mode protection mechanism and consequently read arbitrary files via the
use of the .libfile operator in a crafted postscript document.

Use-after-free vulnerability in Ghostscript 9.20 might allow remote
attackers to execute arbitrary code via vectors related to a reference
leak in .setdevice.

Ghostscript before 9.21 might allow remote attackers to bypass the SAFER
mode protection mechanism and consequently execute arbitrary code by
leveraging type confusion in .initialize_dsc_parser.

libjbig2dec.a in Artifex jbig2dec 0.13, as used in MuPDF and Ghostscript,
has a NULL pointer dereference in the jbig2_huffman_get function in
jbig2_huffman.c. For example, the jbig2dec utility will
crash (segmentation fault) when parsing an invalid file.

References:
https://nvd.nist.gov/vuln/detail/CVE-2016-7977
https://nvd.nist.gov/vuln/detail/CVE-2016-7978
https://nvd.nist.gov/vuln/detail/CVE-2016-7979
https://nvd.nist.gov/vuln/detail/CVE-2017-9216

Upstream patches:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=8abd22010eb4db0fb1b10e430d5f5d83e015ef70
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=6f749c0c44e7b9e09737b9f29edf29925a34f0cf
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=875a0095f37626a721c7ff57d606a0f95af03913
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=3ebffb1d96ba0cacec23016eccb4047dab365853

(From OE-Core rev: 584dfa2f780d5785aaff01f84fbabc18b3478d76)

(From OE-Core rev: 6fed7cd6077c46ad2213226d4675fad9b10ab024)

Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/meta/recipes-extended/ghostscript/ghostscript/CVE-2016-7979.patch b/meta/recipes-extended/ghostscript/ghostscript/CVE-2016-7979.patch
new file mode 100644
index 0000000000..9e930d3a42
--- /dev/null
+++ b/meta/recipes-extended/ghostscript/ghostscript/CVE-2016-7979.patch
@@ -0,0 +1,48 @@
+From 875a0095f37626a721c7ff57d606a0f95af03913 Mon Sep 17 00:00:00 2001
+From: Ken Sharp <ken.sharp@artifex.com>
+Date: Wed, 5 Oct 2016 10:10:58 +0100
+Subject: [PATCH] DSC parser - validate parameters
+
+Bug #697190 ".initialize_dsc_parser doesn't validate the parameter is a dict type before using it."
+
+Regardless of any security implications, its simply wrong for a PostScript
+operator not to validate its parameter(s).
+
+No differences expected.
+
+Upstream-Status: Backport
+CVE: CVE-2016-7979
+
+Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
+---
+ psi/zdscpars.c | 13 +++++++++----
+ 1 file changed, 9 insertions(+), 4 deletions(-)
+
+diff --git a/psi/zdscpars.c b/psi/zdscpars.c
+index c05e154..9b4b605 100644
+--- a/psi/zdscpars.c
++++ b/psi/zdscpars.c
+@@ -150,11 +150,16 @@ zinitialize_dsc_parser(i_ctx_t *i_ctx_p)
+     ref local_ref;
+     int code;
+     os_ptr const op = osp;
+-    dict * const pdict = op->value.pdict;
+-    gs_memory_t * const mem = (gs_memory_t *)dict_memory(pdict);
+-    dsc_data_t * const data =
+-        gs_alloc_struct(mem, dsc_data_t, &st_dsc_data_t, "DSC parser init");
++    dict *pdict;
++    gs_memory_t *mem;
++    dsc_data_t *data;
+ 
++    check_read_type(*op, t_dictionary);
++
++    pdict = op->value.pdict;
++    mem = (gs_memory_t *)dict_memory(pdict);
++
++    data = gs_alloc_struct(mem, dsc_data_t, &st_dsc_data_t, "DSC parser init");
+     if (!data)
+         return_error(gs_error_VMerror);
+     data->document_level = 0;
+-- 
+2.10.2
+