Description:
elfutils is a set of libraries/utilities to handle ELF objects (drop in replacement for libelf).
A fuzz on eu-readelf showed an heap overflow.
The complete ASan output:
# eu-readelf -a $FILE ==1855==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x611000009ffc at pc 0x000000421a8c bp 0x7ffef67082e0 sp 0x7ffef67082d8 READ of size 4 at 0x611000009ffc thread T0 #0 0x421a8b in handle_gnu_hash /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:3268 #1 0x421a8b in handle_hash /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:3346 #2 0x4680f7 in process_elf_file /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:898 #3 0x47ae65 in process_dwflmod /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:690 #4 0x7f4bae746094 in dwfl_getmodules /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/libdwfl/dwfl_getmodules.c:82 #5 0x4365f2 in process_file /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:789 #6 0x405e50 in main /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:305 #7 0x7f4bacd6478f in __libc_start_main (/lib64/libc.so.6+0x2078f) #8 0x406cd8 in _start (/usr/bin/eu-readelf+0x406cd8) 0x611000009ffc is located 0 bytes to the right of 252-byte region [0x611000009f00,0x611000009ffc) allocated by thread T0 here: #0 0x7f4baecaa288 in malloc (/usr/lib/gcc/x86_64-pc-linux-gnu/6.3.0/libasan.so.3+0xc2288) #1 0x7f4bae120f48 in convert_data /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/libelf/elf_getdata.c:166 #2 0x7f4bae120f48 in __libelf_set_data_list_rdlock /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/libelf/elf_getdata.c:434 #3 0x7f4bae1229ba in __elf_getdata_rdlock /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/libelf/elf_getdata.c:541 #4 0x7f4bae122cae in elf_getdata /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/libelf/elf_getdata.c:559 #5 0x41f100 in handle_gnu_hash /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:3206 #6 0x41f100 in handle_hash /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:3346 #7 0x4680f7 in process_elf_file /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:898 #8 0x47ae65 in process_dwflmod /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:690 #9 0x7f4bae746094 in dwfl_getmodules /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/libdwfl/dwfl_getmodules.c:82 #10 0x4365f2 in process_file /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:789 #11 0x405e50 in main /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:305 #12 0x7f4bacd6478f in __libc_start_main (/lib64/libc.so.6+0x2078f) SUMMARY: AddressSanitizer: heap-buffer-overflow /tmp/portage/dev-libs/elfutils-0.168/work/elfutils-0.168/src/readelf.c:3268 in handle_gnu_hash Shadow bytes around the buggy address: 0x0c227fff93a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c227fff93f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00[04] 0x0c227fff9400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9410: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9420: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9430: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9440: 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 Left alloca redzone: ca Right alloca redzone: cb ==1855==ABORTING
Affected version:
0.168
Fixed version:
0.169 (not released atm)
Commit fix:
https://sourceware.org/ml/elfutils-devel/2017-q1/msg00109.html
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-7607
Reproducer:
https://github.com/asarubbo/poc/blob/master/00225-elfutils-heapoverflow-handle_gnu_hash
Timeline:
2017-03-24: bug discovered and reported to upstream
2017-04-04: blog post about the issue
2017-04-09: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
elfutils: heap-based buffer overflow in handle_gnu_hash (readelf.c)
Pingback: elfintils ‘handle_gnu_hash’函数拒绝服务漏洞的补丁 | 黑阔资讯 ' Blog