[Buildroot] [PATCH] libvorbis: add upstream security fixes

Peter Korsgaard peter at korsgaard.com
Fri Feb 16 08:09:55 UTC 2018


Fixes the following security issues:

CVE-2017-14632: 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.

CVE-2017-14633: In libvorbis 1.3.5, an out-of-bounds array read
vulnerability exists in the function mapping0_forward() in mapping0.c, which
may lead to DoS when operating on a crafted audio file with
vorbis_analysis().

Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 ...633-Don-t-allow-for-more-than-256-channel.patch | 36 ++++++++++++++
 ...632-vorbis_analysis_header_out-Don-t-clea.patch | 56 ++++++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 package/libvorbis/0001-CVE-2017-14633-Don-t-allow-for-more-than-256-channel.patch
 create mode 100644 package/libvorbis/0002-CVE-2017-14632-vorbis_analysis_header_out-Don-t-clea.patch

diff --git a/package/libvorbis/0001-CVE-2017-14633-Don-t-allow-for-more-than-256-channel.patch b/package/libvorbis/0001-CVE-2017-14633-Don-t-allow-for-more-than-256-channel.patch
new file mode 100644
index 0000000000..416aa66ddf
--- /dev/null
+++ b/package/libvorbis/0001-CVE-2017-14633-Don-t-allow-for-more-than-256-channel.patch
@@ -0,0 +1,36 @@
+From a79ec216cd119069c68b8f3542c6a425a74ab993 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx at sigxcpu.org>
+Date: Tue, 31 Oct 2017 18:32:46 +0100
+Subject: [PATCH] CVE-2017-14633: Don't allow for more than 256 channels
+
+Otherwise
+
+ for(i=0;i<vi->channels;i++){
+      /* the encoder setup assumes that all the modes used by any
+         specific bitrate tweaking use the same floor */
+      int submap=info->chmuxlist[i];
+
+overreads later in mapping0_forward since chmuxlist is a fixed array of
+256 elements max.
+
+Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
+---
+ lib/info.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/info.c b/lib/info.c
+index fe759ed..7bc4ea4 100644
+--- a/lib/info.c
++++ b/lib/info.c
+@@ -588,7 +588,7 @@ int vorbis_analysis_headerout(vorbis_dsp_state *v,
+   oggpack_buffer opb;
+   private_state *b=v->backend_state;
+ 
+-  if(!b||vi->channels<=0){
++  if(!b||vi->channels<=0||vi->channels>256){
+     ret=OV_EFAULT;
+     goto err_out;
+   }
+-- 
+2.11.0
+
diff --git a/package/libvorbis/0002-CVE-2017-14632-vorbis_analysis_header_out-Don-t-clea.patch b/package/libvorbis/0002-CVE-2017-14632-vorbis_analysis_header_out-Don-t-clea.patch
new file mode 100644
index 0000000000..ffb4cc92f2
--- /dev/null
+++ b/package/libvorbis/0002-CVE-2017-14632-vorbis_analysis_header_out-Don-t-clea.patch
@@ -0,0 +1,56 @@
+From c1c2831fc7306d5fbd7bc800324efd12b28d327f Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx at 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.
+
+Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
+---
+ lib/info.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/lib/info.c b/lib/info.c
+index 7bc4ea4..8d0b2ed 100644
+--- a/lib/info.c
++++ b/lib/info.c
+@@ -589,6 +589,7 @@ 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;
+   }
+-- 
+2.11.0
+
-- 
2.11.0



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