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Date: Wed, 15 Jun 2016 02:38:54 +0000
From: 张开翔 <zhangkaixiang@....cn>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: CVE-2016-5317: GNOME nautilus: crash occurs when generating a
thumbnail for a crafted TIFF image
Details
============
Product: nautilus
Affected Versions: <= GNOME nautilus 3.18.5, <=libtiff.so 4.0.6
Vulnerability Type: out-of-bounds write
Tested system: fedora23 32bit, fedora23 64bit
Vendor URL: https://www.gnome.org/
CVE ID: CVE-2016-5317
Credit: Kaixiang Zhang of the Cloud Security Team, Qihoo 360
Introduction
============
It was always corrupted when I use nautilus command followed a specific directory containing a crafted TIFF image. The vulnerability of out-of-bound writes is in PixarLogDecode() in libtiff.so without checking the buffer length, which cause the head data of next heap could be filled with any data, crash occurs when the next heap is allocated or freed. Attackers could exploit this issue to crash nautilus to result in DoS.
Source info
============
1082 wp += n + stride - 1; /* point to last one */
1083 ip += n + stride - 1; /* point to last one */
1084 n -= stride;
1085 while (n > 0) {
1086 REPEAT(stride, wp[0] = CLAMP(ip[0]);
1087 wp[stride] -= wp[0];
1088 wp[stride] &= mask;
1089 wp--; ip--)
1090 n -= stride;
1091 }
1092 REPEAT(stride, wp[0] = CLAMP(ip[0]); wp--; ip--)
Debug info
============
gdb –args nautilus .
(gdb) b tif_pixarlog.c:787
Breakpoint 1 at 0xaeba016c: file tif_pixarlog.c, line 787.
(gdb) c
Continuing.
Breakpoint 1, PixarLogDecode (tif=0xaec037a8,
op=0xaec03bd0 "\377\377\377\377\377\377\304B\270\016\367\002\377\377\377\377\234}\261\033\033\006\377\377\377\377P\354\032\064}\v\315\001\377\377\377\377\005b\234\025\304\004\377\377\377\377i\270\250(\367\b\243", occ=<optimized out>, s=0) at tif_pixarlog.c:787
787 int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
(gdb) x/32xw sp->stream->next_out-8
0xaec03c58: 0x8b8a8988 0x00000055 0xaec000b0 0xaec000b0
0xaec03c68: 0x9b9a9998 0x9f9e9d9c 0xa3a2a1a0 0xa7a6a5a4
(gdb) x/32xw sp->stream->next_out-8+0x50
0xaec03ca8: 0xdbdad9d8 0x00000029 0xaec00060 0xaec00060
0xaec03cb8: 0xebeae9e8 0xefeeedec 0xf3f2f1f0 0xf7f6f5f4
(gdb) finish
(gdb) x/32xw sp->stream->next_out-8
0xaec03c58: 0x8b8a8988 0x00000055 0x86868686 0x93920d0c
0xaec03c68: 0xa09e1a18 0xadaa2724 0xbab63430 0xc7c2413c
(gdb) x/32xw sp->stream->next_out-8+0x50
0xaec03ca8: 0x93920d0c 0x409d1a18 0x4da9c723 0x5ab5d42f
0xaec03cb8: 0x67c1e13b 0x74cdee47 0x81d9fb53 0x8ee5085f
(gdb) c
Continuing.
[Thread 0xb0723b40 (LWP 24948) exited]
Program received signal SIGSEGV, Segmentation fault.
0xb6be4d38 in _int_free (av=0xaec00010, p=<optimized out>, have_lock=0) at malloc.c:4015
4015 unlink(av, nextchunk, bck, fwd);
(gdb) p av
$42 = (mstate) 0xaec00010
(gdb) p nextchunk
$43 = (mchunkptr) 0xaec03c58
(gdb) x/8xw nextchunk
(gdb) p bck
$44 = (mchunkptr) 0x93920d0c
(gdb) p fwd
$45 = (mchunkptr) 0x86868686
0xaec03c58: 0x8b8a8988 0x00000055 0x86868686 0x93920d0c
0xaec03c68: 0xa09e1a18 0xadaa2724 0xbab63430 0xc7c2413c
(gdb) bt
#0 0xb6be4d38 in _int_free (av=0xaec00010, p=<optimized out>, have_lock=0) at malloc.c:4015
#1 0xb6be86e0 in __GI___libc_free (mem=0xaec00010) at malloc.c:2969
#2 0xad3438f8 in _TIFFfree (p=0xaec00010) at tif_unix.c:322
#3 0xad2c2050 in gtTileContig (img=0xadb709d4, raster=0xae51f560, w=34, h=4) at tif_getimage.c:691
#4 0xad2ca517 in TIFFRGBAImageGet (img=0xadb709d4, raster=0xae51f560, w=34, h=4) at tif_getimage.c:500
#5 0xad2ca73c in TIFFReadRGBAImageOriented (tif=0xae505be8, rwidth=34, rheight=4, raster=0xae51f560, orientation=1, stop=1) at tif_getimage.c:519
#6 0xae71b37f in tiff_image_parse () from /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-tiff.so
#7 0xae71b94e in gdk_pixbuf.tiff_image_stop_load () from /usr/lib/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-tiff.so
#8 0xb75283e3 in gdk_pixbuf_loader_close () from /usr/lib/libgdk_pixbuf-2.0.so.0
#9 0xb7f5edb5 in _gdk_pixbuf_new_from_uri_at_scale.constprop.7 () from /usr/lib/libgnome-desktop-3.so.12
#10 0xb7f5f41b in gnome_desktop_thumbnail_factory_generate_thumbnail () from /usr/lib/libgnome-desktop-3.so.12
#11 0x800e0ef9 in thumbnail_thread_start ()
#12 0xb6d45452 in start_thread (arg=0xadb72b40) at pthread_create.c:334
#13 0xb6c6925e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:122
Best regards,
Kaixiang Zhang
------
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