[Bug libdw/24140] New: A Heap-buffer-overflow problem was discovered in the function __libdw_next_unit in dwarf_nextcu.c in libdw

[wcventure at 126 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24140

            Bug ID: 24140
           Summary: A Heap-buffer-overflow problem was discovered in the
                    function __libdw_next_unit in dwarf_nextcu.c in libdw
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: libdw
          Assignee: unassigned at sourceware dot org
          Reporter: wcventure at 126 dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Created attachment 11574
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11574&action=edit
POC

Hi, 

A Heap-buffer-overflow problem was discovered in the function __libdw_next_unit
in dwarf_nextcu.c in libdw, as distributed in Elfutils 0.175. A crafted ELF
input can cause segment faults and I have confirmed them with address sanitizer
too.

Here are the POC files. Please use "./eu-nm -C $POC" to reproduce the error.

$git log

> commit a17c2c0917901ffa542ac4d3e327d46742219e04
> Author: Mark Wielaard <mark@klomp.org>
> Date:   Tue Jan 22 15:55:18 2019 +0100
> 
>     readelf: Don't go past end of line data reading unknown opcode parameters.
> 
>     https://sourceware.org/bugzilla/show_bug.cgi?id=24116
> 
>     Signed-off-by: Mark Wielaard <mark@klomp.org>

The ASAN dumps the stack trace as follows:

> =================================================================
> ==12766==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000000032 at pc 0x7f1605a83c52 bp 0x7ffeba226910 sp 0x7ffeba226900
> READ of size 2 at 0x603000000032 thread T0
>     #0 0x7f1605a83c51 in __libdw_next_unit /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:249
>     #1 0x7f1605a83f3c in dwarf_next_unit /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:46
>     #2 0x7f1605a83f3c in dwarf_nextcu /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:294
>     #3 0x408273 in get_local_names /home/wencheng/Experiment/elfutils/src/nm.c:627
>     #4 0x408273 in show_symbols /home/wencheng/Experiment/elfutils/src/nm.c:1285
>     #5 0x40e5bd in handle_elf /home/wencheng/Experiment/elfutils/src/nm.c:1578
>     #6 0x40387c in process_file /home/wencheng/Experiment/elfutils/src/nm.c:374
>     #7 0x40387c in main /home/wencheng/Experiment/elfutils/src/nm.c:249
>     #8 0x7f1604e6782f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
>     #9 0x404568 in _start (/home/wencheng/Experiment/elfutils/build/bin/eu-nm+0x404568)
> 
> 0x603000000032 is located 2 bytes to the right of 32-byte region [0x603000000010,0x603000000030)
> allocated by thread T0 here:
>     #0 0x7f1605f4ab90 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb90)
>     #1 0x7f16057feec3 in convert_data /home/wencheng/Experiment/elfutils/libelf/elf_getdata.c:157
>     #2 0x7f16057feec3 in __libelf_set_data_list_rdlock /home/wencheng/Experiment/elfutils/libelf/elf_getdata.c:447
> 
> SUMMARY: AddressSanitizer: heap-buffer-overflow /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:249 in __libdw_next_unit
> Shadow bytes around the buggy address:
>   0x0c067fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x0c067fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x0c067fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x0c067fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>   0x0c067fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> =>0x0c067fff8000: fa fa 00 00 00 00[fa]fa fa fa fa fa fa fa fa fa
>   0x0c067fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
>   0x0c067fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
>   0x0c067fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
>   0x0c067fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
>   0x0c067fff8050: 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
> ==12766==ABORTING

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