[Buildroot] [PATCH 1/1] package/ghostscript: fix CVE-2020-15900
Fabrice Fontaine
fontaine.fabrice at gmail.com
Mon Aug 10 09:14:41 UTC 2020
A memory corruption issue was found in Artifex Ghostscript 9.50 and
9.52. Use of a non-standard PostScript operator can allow overriding of
file access controls. The 'rsearch' calculation for the 'post' size
resulted in a size that was too large, and could underflow to max
uint32_t. This was fixed in commit
5d499272b95a6b890a1397e11d20937de000d31b.
Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
---
...emory-Corruption-in-Ghostscript-9-52.patch | 54 +++++++++++++++++++
package/ghostscript/ghostscript.mk | 3 ++
2 files changed, 57 insertions(+)
create mode 100644 package/ghostscript/0002-Bug-702582-CVE-2020-15900-Memory-Corruption-in-Ghostscript-9-52.patch
diff --git a/package/ghostscript/0002-Bug-702582-CVE-2020-15900-Memory-Corruption-in-Ghostscript-9-52.patch b/package/ghostscript/0002-Bug-702582-CVE-2020-15900-Memory-Corruption-in-Ghostscript-9-52.patch
new file mode 100644
index 0000000000..893b96c5be
--- /dev/null
+++ b/package/ghostscript/0002-Bug-702582-CVE-2020-15900-Memory-Corruption-in-Ghostscript-9-52.patch
@@ -0,0 +1,54 @@
+From 5d499272b95a6b890a1397e11d20937de000d31b Mon Sep 17 00:00:00 2001
+From: Ray Johnston <ray.johnston at artifex.com>
+Date: Wed, 22 Jul 2020 09:57:54 -0700
+Subject: [PATCH] Bug 702582, CVE 2020-15900 Memory Corruption in Ghostscript
+ 9.52
+
+Fix the 'rsearch' calculation for the 'post' size to give the correct
+size. Previous calculation would result in a size that was too large,
+and could underflow to max uint32_t. Also fix 'rsearch' to return the
+correct 'pre' string with empty string match.
+
+A future change may 'undefine' this undocumented, non-standard operator
+during initialization as we do with the many other non-standard internal
+PostScript operators and procedures.
+
+[Retrieved from:
+https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5d499272b95a6b890a1397e11d20937de000d31b]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
+---
+ psi/zstring.c | 17 +++++++++++------
+ 1 file changed, 11 insertions(+), 6 deletions(-)
+
+diff --git a/psi/zstring.c b/psi/zstring.c
+index 33662dafa..58e1af2b3 100644
+--- a/psi/zstring.c
++++ b/psi/zstring.c
+@@ -142,13 +142,18 @@ search_impl(i_ctx_t *i_ctx_p, bool forward)
+ return 0;
+ found:
+ op->tas.type_attrs = op1->tas.type_attrs;
+- op->value.bytes = ptr;
+- r_set_size(op, size);
++ op->value.bytes = ptr; /* match */
++ op->tas.rsize = size; /* match */
+ push(2);
+- op[-1] = *op1;
+- r_set_size(op - 1, ptr - op[-1].value.bytes);
+- op1->value.bytes = ptr + size;
+- r_set_size(op1, count + (!forward ? (size - 1) : 0));
++ op[-1] = *op1; /* pre */
++ op[-3].value.bytes = ptr + size; /* post */
++ if (forward) {
++ op[-1].tas.rsize = ptr - op[-1].value.bytes; /* pre */
++ op[-3].tas.rsize = count; /* post */
++ } else {
++ op[-1].tas.rsize = count; /* pre */
++ op[-3].tas.rsize -= count + size; /* post */
++ }
+ make_true(op);
+ return 0;
+ }
+--
+2.17.1
+
diff --git a/package/ghostscript/ghostscript.mk b/package/ghostscript/ghostscript.mk
index 7d12195f17..5c2c14de0b 100644
--- a/package/ghostscript/ghostscript.mk
+++ b/package/ghostscript/ghostscript.mk
@@ -23,6 +23,9 @@ GHOSTSCRIPT_DEPENDENCIES = \
libpng \
tiff
+# 0002-Bug-702582-CVE-2020-15900-Memory-Corruption-in-Ghostscript-9-52.patch
+GHOSTSCRIPT_IGNORE_CVES += CVE-2020-15900
+
# Ghostscript includes (old) copies of several libraries, delete them.
# Inspired by linuxfromscratch:
# http://www.linuxfromscratch.org/blfs/view/svn/pst/gs.html
--
2.27.0
More information about the buildroot
mailing list