Description

Heap-based Buffer Overflow in r_read_le32

Environment

radare2 5.6.7 0 @ linux-x86-64 git.
commit: 5.6.7 build: 2022-04-12__15:06:26

Build

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

POC

radare2 -q -A ./poc

poc

Asan

=================================================================
==3071761==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62400012dd3f at pc 0x7fc8a4099d74 bp 0x7ffd137eb720 sp 0x7ffd137eb710
READ of size 1 at 0x62400012dd3f thread T0
    #0 0x7fc8a4099d73 in r_read_le32 /home/ubuntu/radare2-master/libr/include/r_endian.h:176
    #1 0x7fc8a4099d73 in r_read_at_le32 /home/ubuntu/radare2-master/libr/include/r_endian.h:185
    #2 0x7fc8a4099d73 in r_read_le64 /home/ubuntu/radare2-master/libr/include/r_endian.h:199
    #3 0x7fc8a4099d73 in r_read_ble64 /home/ubuntu/radare2-master/libr/include/r_endian.h:322
    #4 0x7fc8a4099d73 in r_read_ble /home/ubuntu/radare2-master/libr/include/r_endian.h:346
    #5 0x7fc8a4099d73 in r_coresym_cache_element_new /home/ubuntu/radare2-master/libr/..//libr/bin/p/../format/mach0/coresymbolication.c:280
    #6 0x7fc8a408feb3 in parseDragons /home/ubuntu/radare2-master/libr/..//libr/bin/p/bin_symbols.c:253
    #7 0x7fc8a408feb3 in load_buffer /home/ubuntu/radare2-master/libr/..//libr/bin/p/bin_symbols.c:292
    #8 0x7fc8a408feb3 in load_buffer /home/ubuntu/radare2-master/libr/..//libr/bin/p/bin_symbols.c:256
    #9 0x7fc8a3b6605a in r_bin_object_new /home/ubuntu/radare2-master/libr/bin/bobj.c:147
    #10 0x7fc8a3b576f3 in r_bin_file_new_from_buffer /home/ubuntu/radare2-master/libr/bin/bfile.c:585
    #11 0x7fc8a3b12697 in r_bin_open_buf /home/ubuntu/radare2-master/libr/bin/bin.c:279
    #12 0x7fc8a3b13a6f in r_bin_open_io /home/ubuntu/radare2-master/libr/bin/bin.c:339
    #13 0x7fc8a495fd2f in r_core_file_do_load_for_io_plugin /home/ubuntu/radare2-master/libr/core/cfile.c:435
    #14 0x7fc8a495fd2f in r_core_bin_load /home/ubuntu/radare2-master/libr/core/cfile.c:636
    #15 0x7fc8a495fd2f in r_core_bin_load /home/ubuntu/radare2-master/libr/core/cfile.c:604
    #16 0x7fc8a76859d2 in r_main_radare2 /home/ubuntu/radare2-master/libr/main/radare2.c:1188
    #17 0x7fc8a74210b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #18 0x5604fe78babd in _start (/home/ubuntu/radare2-master/binr/radare2/radare2+0x9abd)

0x62400012dd3f is located 0 bytes to the right of 7231-byte region [0x62400012c100,0x62400012dd3f)
allocated by thread T0 here:
    #0 0x5604fe876b08 in __interceptor_malloc (/home/ubuntu/radare2-master/binr/radare2/radare2+0xf4b08)
    #1 0x7fc8a40932a4 in r_coresym_cache_element_new /home/ubuntu/radare2-master/libr/..//libr/bin/p/../format/mach0/coresymbolication.c:180

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/ubuntu/radare2-master/libr/include/r_endian.h:176 in r_read_le32
Shadow bytes around the buggy address:
  0x0c488001db50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c488001db60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c488001db70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c488001db80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c488001db90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c488001dba0: 00 00 00 00 00 00 00[07]fa fa fa fa fa fa fa fa
  0x0c488001dbb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c488001dbc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c488001dbd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c488001dbe0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c488001dbf0: 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
==3071761==ABORTING

Impact

The bug causes the program reads data past the end of the intented buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash.