Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Sun, 26 Feb 2017 11:52:23 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: audiofile: heap-based buffer overflow in IMA::decodeBlockWAVE (IMA.cpp)

Description:
audiofile is a C-based library for reading and writing audio files in many common formats.

A fuzz on it discovered an heap overflow.

The complete ASan output:

# sfconvert @@ out.mp3 format aiff
==2486==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62f0000286e8 at pc 0x7fc5db36626e bp 0x7ffcecb1cbf0 sp 0x7ffcecb1cbe8                                                                                                                                       
WRITE of size 2 at 0x62f0000286e8 thread T0                                                                                                                                                                                                                                    
    #0 0x7fc5db36626d in IMA::decodeBlockWAVE(unsigned char const*, short*) /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:188:13                                                                                                
    #1 0x7fc5db365671 in IMA::decodeBlock(unsigned char const*, short*) /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:110:10                                                                                                    
    #2 0x7fc5db361ac9 in BlockCodec::runPull() /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/BlockCodec.cpp:55:3                                                                                                                        
    #3 0x7fc5db39ac20 in RebufferModule::runPull() /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/RebufferModule.cpp:122:3                                                                                                               
    #4 0x7fc5db34b05a in afReadFrames /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/data.cpp:222:14                                                                                                                                             
    #5 0x50bbeb in copyaudiodata /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:340:29                                                                                                                                                 
    #6 0x50b050 in main /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:248:17                                                                                                                                                          
    #7 0x7fc5da42078f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289                                                                                                                                                     
    #8 0x419f48 in _init (/usr/bin/sfconvert+0x419f48)                                                                                                                                                                                                                         
                                                                                                                                                                                                                                                                               
0x62f0000286e8 is located 0 bytes to the right of 49896-byte region [0x62f00001c400,0x62f0000286e8)                                                                                                                                                                            
allocated by thread T0 here:                                                                                                                                                                                                                                                   
    #0 0x4d2d08 in malloc /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:64                                                                                                                                       
    #1 0x7fc5da0b9687 in operator new(unsigned long) (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libstdc++.so.6+0xb2687)                                                                                                                                                           
    #2 0x7fc5db34f43c in afGetFrameCount /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/format.cpp:205:41                                                                                                                                        
    #3 0x50bb5c in copyaudiodata /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:329:29                                                                                                                                                 
    #4 0x50b050 in main /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:248:17                                                                                                                                                          
    #5 0x7fc5da42078f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289                                                                                                                                                     
                                                                                                                                                                                                                                                                               
SUMMARY: AddressSanitizer: heap-buffer-overflow /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:188:13 in IMA::decodeBlockWAVE(unsigned 
char const*, short*)                                                                      
Shadow bytes around the buggy address:                                                                                                                                                                                                                                         
  0x0c5e7fffd080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00                                                                                                                                                                                                              
  0x0c5e7fffd090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd0a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd0b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd0c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5e7fffd0d0: 00 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa fa
  0x0c5e7fffd0e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd0f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd100: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd120: 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 right 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
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==2486==ABORTING

Affected version:
0.3.6

Fixed version:
N/A

Commit fix:
N/A

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
N/A

Reproducer:
https://github.com/asarubbo/poc/blob/master/00185-audiofile-heapoverflow-IMA-decodeBlockWAVE

Timeline:
2017-02-20: bug discovered and reported to upstream
2017-02-20: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2017/02/20/audiofile-heap-based-buffer-overflow-in-imadecodeblockwave-ima-cpp

--
Agostino Sarubbo
Gentoo Linux Developer


Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.