AddressSanitizer: heap-buffer-overflow /src/exiv2/src/webpimage.cpp:563 Exiv2::WebPImage::decodeChunks(unsigned long)

[cool-tomato]

$ exiv2 -pp $POC 

=================================================================
==23==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000ef32 at pc 0x7f19a962fc0e bp 0x7fff01cdcc00 sp 0x7fff01cdcbf0
READ of size 3 at 0x60200000ef32 thread T0
    #0 0x7f19a962fc0d in Exiv2::WebPImage::decodeChunks(unsigned long) /src/exiv2/src/webpimage.cpp:563
    #1 0x7f19a9634cbe in Exiv2::WebPImage::readMetadata() /src/exiv2/src/webpimage.cpp:496
    #2 0x462b13 in Action::Print::printPreviewList() /src/exiv2/src/actions.cpp:801
    #3 0x46f837 in Action::Print::run(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /src/exiv2/src/actions.cpp:254
    #4 0x40c735 in main /src/exiv2/src/exiv2.cpp:166
    #5 0x7f19a87b482f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #6 0x40d688 in _start (/src/aflbuild/installed/bin/exiv2+0x40d688)

0x60200000ef34 is located 0 bytes to the right of 4-byte region [0x60200000ef30,0x60200000ef34)
allocated by thread T0 here:
    #0 0x7f19a9f656b2 in operator new[](unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x996b2)
    #1 0x7f19a962bbc7 in Exiv2::DataBuf::DataBuf(long) /src/exiv2/include/exiv2/types.hpp:206
    #2 0x7f19a962bbc7 in Exiv2::WebPImage::decodeChunks(unsigned long) /src/exiv2/src/webpimage.cpp:517

SUMMARY: AddressSanitizer: heap-buffer-overflow /src/exiv2/src/webpimage.cpp:563 Exiv2::WebPImage::decodeChunks(unsigned long)
Shadow bytes around the buggy address:
  0x0c047fff9d90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9da0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9db0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9dc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9dd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c047fff9de0: fa fa fa fa fa fa[04]fa fa fa 05 fa fa fa 05 fa
  0x0c047fff9df0: fa fa 00 fa fa fa 00 fa fa fa 00 fa fa fa fd fa
  0x0c047fff9e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e30: 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
==23==ABORTING

1-poc-heapoverflow

[kirotawa]

It was assigned this CVE number for this issue https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14046