Description

heap-buffer-overflow /home/ubuntu/libmobi-public/src/parse_rawml.c:110 in mobi_search_links_kf7

Environment

Distributor ID:	Ubuntu
Description:	Ubuntu 20.04 LTS
Release:	20.04
Codename:	focal
mobitool build: Apr 29 2022 20:52:30 (gcc 9.3.0)
libmobi: 0.10

Build

export CC=gcc CXX=g++ CFLAGS="-fsanitize=address -static-libasan" CXXFLAGS="-fsanitize=address -static-libasan" LDFLAGS="-fsanitize=address -static-libasan"
autogen.sh &&  ./configure && make

POC

./mobitool -e -o ./tmp/ ./poc5

poc5

ASAN

==1028892==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62500000748f at pc 0x5631f27052e4 bp 0x7ffe6493c610 sp 0x7ffe6493c600
READ of size 1 at 0x62500000748f thread T0
    #0 0x5631f27052e3 in mobi_search_links_kf7 /home/ubuntu/libmobi-public/src/parse_rawml.c:110
    #1 0x5631f27052e3 in mobi_search_links_kf7 /home/ubuntu/libmobi-public/src/parse_rawml.c:63
    #2 0x5631f2714a31 in mobi_reconstruct_links_kf7 /home/ubuntu/libmobi-public/src/parse_rawml.c:1679
    #3 0x5631f27180d0 in mobi_reconstruct_links /home/ubuntu/libmobi-public/src/parse_rawml.c:1849
    #4 0x5631f27180d0 in mobi_parse_rawml_opt /home/ubuntu/libmobi-public/src/parse_rawml.c:2153
    #5 0x5631f27180d0 in mobi_parse_rawml /home/ubuntu/libmobi-public/src/parse_rawml.c:2009
    #6 0x5631f25bbe00 in loadfilename /home/ubuntu/libmobi-public/tools/mobitool.c:852
    #7 0x5631f25bbe00 in main /home/ubuntu/libmobi-public/tools/mobitool.c:1051
    #8 0x7f5bf47900b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #9 0x5631f25c76fd in _start (/home/ubuntu/libmobi-public/tools/mobitool+0x266fd)

0x62500000748f is located 0 bytes to the right of 9103-byte region [0x625000005100,0x62500000748f)
allocated by thread T0 here:
    #0 0x5631f26b2748 in malloc (/home/ubuntu/libmobi-public/tools/mobitool+0x111748)
    #1 0x5631f270cfc0 in mobi_reconstruct_parts /home/ubuntu/libmobi-public/src/parse_rawml.c:805

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/ubuntu/libmobi-public/src/parse_rawml.c:110 in mobi_search_links_kf7
Shadow bytes around the buggy address:
  0x0c4a7fff8e40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8e50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8e60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8e70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4a7fff8e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c4a7fff8e90: 00[07]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fff8ea0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fff8eb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fff8ec0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fff8ed0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4a7fff8ee0: 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
==1028892==ABORTING