libvorbis: CVE-2017-14632

Xiph.Org libvorbis 1.3.5 allows Remote Code Execution upon freeing
uninitialized memory in the function vorbis_analysis_headerout() in
info.c when vi->channels<=0, a similar issue to Mozilla bug 550184.

References:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14632

(From OE-Core rev: e584aca38396db5e3d461f57804519261eecedc2)

Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 63 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/libvorbis/libvorbis/CVE-2017-14632.patch b/meta/recipes-multimedia/libvorbis/libvorbis/CVE-2017-14632.patch
new file mode 100644
index 0000000000..4036b966fe
--- /dev/null
+++ b/meta/recipes-multimedia/libvorbis/libvorbis/CVE-2017-14632.patch
@@ -0,0 +1,62 @@
+From 39704ce16835e5c019bb03f6a94dc1f0677406c5 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx@sigxcpu.org>
+Date: Wed, 15 Nov 2017 18:22:59 +0100
+Subject: [PATCH] CVE-2017-14632: vorbis_analysis_header_out: Don't clear opb
+ if not initialized
+
+If the number of channels is not within the allowed range
+we call oggback_writeclear altough it's not initialized yet.
+
+This fixes
+
+    =23371== Invalid free() / delete / delete[] / realloc()
+    ==23371==    at 0x4C2CE1B: free (vg_replace_malloc.c:530)
+    ==23371==    by 0x829CA31: oggpack_writeclear (in /usr/lib/x86_64-linux-gnu/libogg.so.0.8.2)
+    ==23371==    by 0x84B96EE: vorbis_analysis_headerout (info.c:652)
+    ==23371==    by 0x9FBCBCC: ??? (in /usr/lib/x86_64-linux-gnu/sox/libsox_fmt_vorbis.so)
+    ==23371==    by 0x4E524F1: ??? (in /usr/lib/x86_64-linux-gnu/libsox.so.2.0.1)
+    ==23371==    by 0x4E52CCA: sox_open_write (in /usr/lib/x86_64-linux-gnu/libsox.so.2.0.1)
+    ==23371==    by 0x10D82A: open_output_file (sox.c:1556)
+    ==23371==    by 0x10D82A: process (sox.c:1753)
+    ==23371==    by 0x10D82A: main (sox.c:3012)
+    ==23371==  Address 0x68768c8 is 488 bytes inside a block of size 880 alloc'd
+    ==23371==    at 0x4C2BB1F: malloc (vg_replace_malloc.c:298)
+    ==23371==    by 0x4C2DE9F: realloc (vg_replace_malloc.c:785)
+    ==23371==    by 0x4E545C2: lsx_realloc (in /usr/lib/x86_64-linux-gnu/libsox.so.2.0.1)
+    ==23371==    by 0x9FBC9A0: ??? (in /usr/lib/x86_64-linux-gnu/sox/libsox_fmt_vorbis.so)
+    ==23371==    by 0x4E524F1: ??? (in /usr/lib/x86_64-linux-gnu/libsox.so.2.0.1)
+    ==23371==    by 0x4E52CCA: sox_open_write (in /usr/lib/x86_64-linux-gnu/libsox.so.2.0.1)
+    ==23371==    by 0x10D82A: open_output_file (sox.c:1556)
+    ==23371==    by 0x10D82A: process (sox.c:1753)
+    ==23371==    by 0x10D82A: main (sox.c:3012)
+
+as seen when using the testcase from CVE-2017-11333 with
+008d23b782be09c8d75ba8190b1794abd66c7121 applied. However the error was
+there before.
+
+Upstream-Status: Backport
+CVE: CVE-2017-14632
+
+Reference to upstream patch:
+https://git.xiph.org/?p=vorbis.git;a=commitdiff;h=c1c2831fc7306d5fbd7bc800324efd12b28d327f
+
+Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
+---
+ lib/info.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/lib/info.c b/lib/info.c
+index 81b7557..4d82568 100644
+--- a/lib/info.c
++++ b/lib/info.c
+@@ -584,6 +584,7 @@ int vorbis_analysis_headerout(vorbis_dsp_state *v,
+   private_state *b=v->backend_state;
+ 
+   if(!b||vi->channels<=0||vi->channels>256){
++    b = NULL;
+     ret=OV_EFAULT;
+     goto err_out;
+   }
+-- 
+2.16.2
+
diff --git a/meta/recipes-multimedia/libvorbis/libvorbis_1.3.5.bb b/meta/recipes-multimedia/libvorbis/libvorbis_1.3.5.bb
index 73f9d1af2c..32e92f009a 100644
--- a/meta/recipes-multimedia/libvorbis/libvorbis_1.3.5.bb
+++ b/meta/recipes-multimedia/libvorbis/libvorbis_1.3.5.bb
@@ -13,6 +13,7 @@ DEPENDS = "libogg"
 SRC_URI = "http://downloads.xiph.org/releases/vorbis/${BP}.tar.xz \
            file://0001-configure-Check-for-clang.patch \
            file://CVE-2017-14633.patch \
+           file://CVE-2017-14632.patch \
           "
 SRC_URI[md5sum] = "28cb28097c07a735d6af56e598e1c90f"
 SRC_URI[sha256sum] = "54f94a9527ff0a88477be0a71c0bab09a4c3febe0ed878b24824906cd4b0e1d1"