$ ./lepton -unjailed ./poc_lepton103.jpg
lepton v1.0-3d1bc19
START ACHIEVED 1605510405 108011
TS_MAIN (0) 0.000000
TS_MODEL_INIT_BEGIN (0) 0.023684
TS_MODEL_INIT (0) 0.028371
TS_THREAD_STARTED (0) 0.021059
TS_READ_STARTED (0) 0.021163
TS_READ_FINISHED (0) 0.021829
TS_JPEG_DECODE_STARTED (0) 0.021829
TS_JPEG_DECODE_FINISHED (0) 0.022058
TS_STREAM_MULTIPLEX_STARTED (0) 0.028561
TS_STREAM_MULTIPLEX_FINISHED (0) 0.028690
TS_ARITH_STARTED (0) 0.023680
TS_ARITH_FINISHED (0) 0.028540
TS_STREAM_FLUSH_STARTED (0) 0.028690
TS_STREAM_FLUSH_FINISHED (0) 0.028693
TS_DONE (0) 0.029254
6647943 bytes needed to decompress this file
226 213
106.10%
START ACHIEVED 1605510405 118279
=================================================================
==9435==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6050000001b2 at pc 0x7f57e83b3e6d bp 0x7fff945a2a50 sp 0x7fff945a21f8
WRITE of size 4 at 0x6050000001b2 thread T0
#0 0x7f57e83b3e6c (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x66e6c)
#1 0x451983 in read_ujpg() src/lepton/jpgcoder.cc:4277
#2 0x46c0b6 in std::_Function_handler<bool (), bool (*)()>::_M_invoke(std::_Any_data const&) /usr/include/c++/9/bits/std_function.h:285
#3 0x465b91 in std::function<bool ()>::operator()() const (/root/fuzz/lepton/lepton+0x465b91)
#4 0x43c737 in execute(std::function<bool ()> const&) src/lepton/jpgcoder.cc:2048
#5 0x43a8f8 in process_file(IOUtil::FileReader*, IOUtil::FileWriter*, int, bool) src/lepton/jpgcoder.cc:1862
#6 0x432cbe in app_main(int, char**) src/lepton/jpgcoder.cc:941
#7 0x48721a in main src/lepton/main.cc:17
#8 0x7f57e769a83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
#9 0x4047b8 in _start (/root/fuzz/lepton/lepton+0x4047b8)
0x6050000001b2 is located 0 bytes to the right of 18-byte region [0x6050000001a0,0x6050000001b2)
allocated by thread T0 here:
#0 0x7f57e8459f3d in posix_memalign (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x10cf3d)
#1 0x4ea100 in custom_malloc src/vp8/util/memory.cc:68
#2 0x408cda in aligned_alloc(unsigned long) src/lepton/bitops.cc:112
#3 0x451963 in read_ujpg() src/lepton/jpgcoder.cc:4276
#4 0x46c0b6 in std::_Function_handler<bool (), bool (*)()>::_M_invoke(std::_Any_data const&) /usr/include/c++/9/bits/std_function.h:285
#5 0x465b91 in std::function<bool ()>::operator()() const (/root/fuzz/lepton/lepton+0x465b91)
#6 0x43c737 in execute(std::function<bool ()> const&) src/lepton/jpgcoder.cc:2048
#7 0x43a8f8 in process_file(IOUtil::FileReader*, IOUtil::FileWriter*, int, bool) src/lepton/jpgcoder.cc:1862
#8 0x432cbe in app_main(int, char**) src/lepton/jpgcoder.cc:941
#9 0x48721a in main src/lepton/main.cc:17
#10 0x7f57e769a83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
SUMMARY: AddressSanitizer: heap-buffer-overflow (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x66e6c)
Shadow bytes around the buggy address:
0x0c0a7fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c0a7fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c0a7fff8000: fa fa fa fa 00 00 00 fa fa fa fa fa 00 00 00 fa
0x0c0a7fff8010: fa fa fa fa fa fa fa fa 00 00 00 fa fa fa fa fa
0x0c0a7fff8020: fd fd fd fa fa fa fa fa fa fa fa fa 00 00 fa fa
=>0x0c0a7fff8030: fa fa fa fa 00 00[02]fa fa fa fa fa fa fa fa fa
0x0c0a7fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0a7fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0a7fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0a7fff8070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c0a7fff8080: 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
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
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
Shadow gap: cc
==9435==ABORTING
Input Size 213 != Roundtrip Size 0
a3f5910646549712dcfd00be41c737bc != d41d8cd98f00b204e9800998ecf8427e
ROUNDTRIP_FAILURE
I set a watchpoint,and then run and continue
watch *0x6050000001b2
r -unjailed ./poc_lepton103.jpg
c
and then see the stack,may be the problem is makeEncoder function
Credit: giantbranch of NSFOCUS Security Team
What's the problem?
A heap buffer overflow write in lepton(https://github.com/dropbox/lepton/commit/3d1bc19da9f13a6e817938afd0f61a81110be4da).
ASAN reports:
I set a watchpoint,and then run and continue
How can we reproduce the issue?
Compile command I use:
reproduce the issue
poc: poc_lepton103.zip
the details about my environment.