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CVE-2016-3621 libtiff: Out-of-bounds Read in the bmp2tiff tool
From: 王梅 <wangmei () 360 cn>
Date: Thu, 7 Apr 2016 07:39:43 +0000
Details ======= Product: libtiff Affected Versions: <= 4.0.6 Vulnerability Type: Out-of-bounds Read Vendor URL: http://www.libtiff.org/ CVE ID: CVE-2016-3621 Credit: Mei Wang of the Cloud Security Team, Qihoo 360 Introduction ============ LZWEncode function in tif_lzw.c in bmp2tiff allows attackers to cause a denial of service (Out-of-bounds Read) via a crafted bmp image with param -c lzw. libtiff-master/libtiff/tif_lzw.c:915 910 */ 911 PutNextCode(op, CODE_CLEAR); 912 ent = *bp++; cc--; incount++; 913 } 914 while (cc > 0) { 915 c = *bp++; cc--; incount++; 916 fcode = ((long)c << BITS_MAX) + ent; 917 h = (c << HSHIFT) ^ ent; /* xor hashing */ ./bmp2tiff -c lzw ./sample/bmp2tiff_lzw.bmp 1.tif ================================================================= ==10455== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fbcd06d1c00 at pc 0x4827aa bp 0x7ffef81741d0 sp 0x7ffef81741c0 READ of size 1 at 0x7fbcd06d1c00 thread T0 #0 0x4827a9 in LZWEncode /home/dazhuang/asan/libtiff-master/libtiff/tif_lzw.c:915 #1 0x45665e in TIFFWriteScanline /home/dazhuang/asan/libtiff-master/libtiff/tif_write.c:173 #2 0x40450f in main /home/dazhuang/asan/libtiff-master/tools/bmp2tiff.c:775 #3 0x7fbcccc92af4 in __libc_start_main (/lib64/libc.so.6+0x21af4) #4 0x4019a8 in _start (/home/dazhuang/asan/libtiff-master/tools/bmp2tiff+0x4019a8) 0x7fbcd06d1c00 is located 0 bytes to the right of 1573888-byte region [0x7fbcd0551800,0x7fbcd06d1c00) allocated by thread T0 here: #0 0x7fbccd563129 (/lib64/libasan.so.0+0x16129) #1 0x45b761 in _TIFFmalloc /home/dazhuang/asan/libtiff-master/libtiff/tif_unix.c:316 #2 0x4037c3 in main /home/dazhuang/asan/libtiff-master/tools/bmp2tiff.c:678 #3 0x7fbcccc92af4 in __libc_start_main (/lib64/libc.so.6+0x21af4) SUMMARY: AddressSanitizer: heap-buffer-overflow /home/dazhuang/asan/libtiff-master/libtiff/tif_lzw.c:915 LZWEncode Shadow bytes around the buggy address: 0x0ff81a0d2330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0ff81a0d2340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0ff81a0d2350: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0ff81a0d2360: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0ff81a0d2370: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0ff81a0d2380:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0ff81a0d2390: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0ff81a0d23a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0ff81a0d23b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0ff81a0d23c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0ff81a0d23d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap righ redzone: fb Freed Heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 ASan internal: fe ==10455== ABORTING References: [1] http://www.remotesensing.org/libtiff/ [2] http://bugzilla.maptools.org/buglist.cgi?product=libtiff Thank you! Best Regards, Mei
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- CVE-2016-3621 libtiff: Out-of-bounds Read in the bmp2tiff tool 王梅 (Apr 07)