https://sourceware.org/bugzilla/show_bug.cgi?id=27076
Bug ID: 27076
Summary: heap-buffer-overflow when calling file_read_elf
function in elf_begin.c in libelf
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libelf
Assignee: unassigned at sourceware dot org
Reporter: 2060271023 at email dot szu.edu.cn
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Created attachment 13055
--> https://sourceware.org/bugzilla/attachment.cgi?id=13055&action=edit
the crafted input causing heap-buffer-overflow
Hi,
A Heap-buffer-overflow problem was discovered in the function file_read_elf in
elf_begin.c in libelf, as distributed in elfutils-0.182. A crafted input can
cause segment faults and I have confirmed them with address sanitizer too.
Here are the POC files. Please use "./eu-stack --core=$POS -abdilmsv" to
reproduce the error.
$ git log
> commit 609290a61d4f900c65b7e0e273981022a826e4c0 (HEAD -> master,
> origin/master, origin/HEAD)
> Author: Mark Wielaard <m...@klomp.org>
> Date: Sun Nov 29 01:57:53 2020 +0100
>
> libdwfl: Use 64bit GElf_Addr instead of size_t to calculate address.
>
> size_t is too small on 32 bit systems to analyze a 64 bit core file.
>
> Signed-off-by: Mark Wielaard <m...@klomp.org>
The ASAN dumps the stack trace as follows:
> =================================================================
> ==5661==ERROR: AddressSanitizer: heap-buffer-overflow on address
> 0x6060000000b0 at pc 0x7f3dda845483 bp 0x7ffcfffb4ad0 sp 0x7ffcfffb4ac0
> READ of size 2 at 0x6060000000b0 thread T0
> #0 0x7f3dda845482 in file_read_elf /elfutils/libelf/elf_begin.c:453
> #1 0x7f3dda845482 in __libelf_read_mmaped_file
> /elfutils/libelf/elf_begin.c:552
> #2 0x7f3dda54f44f in dwfl_segment_report_module
> /elfutils/libdwfl/dwfl_segment_report_module.c:955
> #3 0x7f3dda567165 in dwfl_core_file_report
> /elfutils/libdwfl/core-file.c:558
> #4 0x5584957f0f15 in parse_opt /elfutils/src/stack.c:595
> #5 0x7f3dd9fe0d4a in argp_parse (/lib/x86_64-linux-gnu/libc.so.6+0x12fd4a)
> #6 0x5584957f01f4 in main /elfutils/src/stack.c:695
> #7 0x7f3dd9ed2bf6 in __libc_start_main
> (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
> #8 0x5584957f0bc9 in _start (/elfutils/build/bin/eu-stack+0x5bc9)
>
> 0x6060000000b1 is located 0 bytes to the right of 49-byte region
> [0x606000000080,0x6060000000b1)
> allocated by thread T0 here:
> #0 0x7f3ddabc9d28 in __interceptor_calloc
> (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
> #1 0x7f3dda54f1a6 in dwfl_segment_report_module
> /elfutils/libdwfl/dwfl_segment_report_module.c:907
> #2 0x7f3dda567165 in dwfl_core_file_report
> /elfutils/libdwfl/core-file.c:558
> #3 0x5584957f0f15 in parse_opt /elfutils/src/stack.c:595
> #4 0x7f3dd9fe0d4a in argp_parse (/lib/x86_64-linux-gnu/libc.so.6+0x12fd4a)
> #5 0x5584957f01f4 in main /elfutils/src/stack.c:695
> #6 0x7f3dd9ed2bf6 in __libc_start_main
> (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
>
> SUMMARY: AddressSanitizer: heap-buffer-overflow
> /elfutils/libelf/elf_begin.c:453 in file_read_elf
> Shadow bytes around the buggy address:
> 0x0c0c7fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x0c0c7fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x0c0c7fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x0c0c7fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x0c0c7fff8000: fa fa fa fa 00 00 00 00 00 00 00 00 fa fa fa fa
> =>0x0c0c7fff8010: 00 00 00 00 00 00[01]fa fa fa fa fa fa fa fa fa
> 0x0c0c7fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0c0c7fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0c0c7fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0c0c7fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0c0c7fff8060: 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
> ==5661==ABORTING
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