Package: t1lib
Version: 5.1.2-3
Severity: grave
Tags: patch security
Justification: user security hole
User: ubuntu-de...@lists.ubuntu.com
Usertags: origin-ubuntu precise ubuntu-patch
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0764
*** /tmp/tmpP7Dzmm
In Ubuntu, the attached patch was applied to achieve the following:
Prevents an invalid pointer from being dereferenced when using a
maliciously crafted font.
* SECURITY UPDATE: Arbitrary code execution via crafted Type 1 font
- lib/type1/type1.c: Only use ppoints when it is a valid pointer
- CVE-2011-0764
Thanks for considering the patch.
-- System Information:
Debian Release: wheezy/sid
APT prefers oneiric-updates
APT policy: (500, 'oneiric-updates'), (500, 'oneiric-security'), (500,
'oneiric')
Architecture: amd64 (x86_64)
Kernel: Linux 3.0.0-14-generic (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
--- t1lib-5.1.2.orig/debian/patches/CVE-2011-0764.patch
+++ t1lib-5.1.2/debian/patches/CVE-2011-0764.patch
@@ -0,0 +1,31 @@
+Description: Don't lookup previous point if there isn't any
+Author: Marc Deslauriers <marc.deslauri...@canonical.com>
+
+Index: t1lib-5.1.2/lib/type1/type1.c
+===================================================================
+--- t1lib-5.1.2.orig/lib/type1/type1.c 2011-12-13 14:24:14.280965637 -0600
++++ t1lib-5.1.2/lib/type1/type1.c 2011-12-13 14:25:25.893320747 -0600
+@@ -1700,6 +1700,7 @@
+ long pindex = 0;
+
+ /* compute hinting for previous segment! */
++ if (ppoints == NULL) Error0i("RLineTo: No previous point!\n");
+ FindStems( currx, curry, currx-ppoints[numppoints-2].x, curry-ppoints[numppoints-2].y, dx, dy);
+
+ /* Allocate a new path point and pre-setup data */
+@@ -1728,6 +1729,7 @@
+ long pindex = 0;
+
+ /* compute hinting for previous point! */
++ if (ppoints == NULL) Error0i("RRCurveTo: No previous point!\n");
+ FindStems( currx, curry, currx-ppoints[numppoints-2].x, curry-ppoints[numppoints-2].y, dx1, dy1);
+
+ /* Allocate three new path points and pre-setup data */
+@@ -1903,6 +1905,7 @@
+ FindStems( currx, curry, 0, 0, dx, dy);
+ }
+ else {
++ if (ppoints == NULL) Error0i("RMoveTo: No previous point!\n");
+ FindStems( currx, curry, ppoints[numppoints-2].x, ppoints[numppoints-2].y, dx, dy);
+ }
+
