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Created July 15, 2021 03:52
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From: u@n0.lol <u@n0.lol>
To: security@rizin.re <security@rizin.re>
[ Memory Corruption in vector_free_elems ]
Hi, I am writing to inform you of a bug in vector_free_elems when parsing an ELF
with corrupted section headers.
[ VERSION ]---------------------------------------------------------------------
user@xooted:~$ rizin -v
rizin 0.3.0-git @ linux-x86-64
commit: f2c593d223df71fd54bee7224963598d8f9676ef, build: 2021-07-12__01:15:14
user@xooted:~$ rizin POC.bin
WARNING: Cannot initialize section strings table
WARNING: invalid section offset.Segmentation fault (core dumped)
user@xooted:~$ rz-bin -I POC.bin
WARNING: Cannot initialize section strings table
WARNING: invalid section offset.Segmentation fault (core dumped)
[ BACKTRACE ]-------------------------------------------------------------------
#0 __GI___libc_free (mem=0xacabacabacabacab) at malloc.c:3102
#1 0x00007ffff7d1872d in vector_free_elems (vec=0x5555556ab220) at ../librz/include/rz_vector.h:89
#2 rz_vector_clear (vec=0x5555556ab220) at ../librz/util/vector.c:70
#3 0x00007ffff7d187f2 in rz_vector_fini (vec=0x5555556ab220) at ../librz/util/vector.c:63
#4 0x00007ffff7d18842 in rz_vector_free (vec=0x5555556ab220) at ../librz/util/vector.c:77
#5 0x00007ffff6ccf2a2 in get_sections_from_dt_dynamic (bin=0x5555556843c0) at ../librz/bin/format/elf/elf_sections.c:161
#6 Elf64_rz_bin_elf_convert_sections (bin=bin@entry=0x5555556843c0, sections=sections@entry=0x0) at ../librz/bin/format/elf/elf_sections.c:329
#7 0x00007ffff6cc4cd9 in rz_bin_elf_init_shdr (sections=0x0, bin=0x5555556843c0) at ../librz/bin/format/elf/elf.c:347
#8 rz_bin_elf_init (bin=0x5555556843c0) at ../librz/bin/format/elf/elf.c:347
#9 Elf64_rz_bin_elf_new_buf (buf=<optimized out>) at ../librz/bin/format/elf/elf.c:381
#10 0x00007ffff6c9df30 in load_buffer (bf=<optimized out>, bin_obj=0x555555684b90, buf=<optimized out>, loadaddr=<optimized out>, sdb=<optimized out>) at ../librz/bin/p/bin_elf.inc:82
#11 0x00007ffff6c8b131 in rz_bin_object_new (bf=bf@entry=0x555555684920, plugin=plugin@entry=0x5555555958e0, opts=opts@entry=0x7ffffff9c5c8, offset=offset@entry=0x0, sz=<optimized out>) at ../librz/bin/bobj.c:271
#12 0x00007ffff6c87f8c in rz_bin_file_new_from_buffer (bin=bin@entry=0x555555590eb0, file=<optimized out>, buf=buf@entry=0x555555684d70, rawstr=<optimized out>, opts=opts@entry=0x7ffffff9c5c8, fd=<optimized out>, pluginname=0x0)
at ../librz/bin/bfile.c:551
#13 0x00007ffff6c7d384 in rz_bin_open_buf (bin=bin@entry=0x555555590eb0, buf=buf@entry=0x555555684d70, opt=opt@entry=0x7ffffff9c5c0) at ../librz/bin/bin.c:280
#14 0x00007ffff6c7d6ac in rz_bin_open_io (bin=bin@entry=0x555555590eb0, opt=opt@entry=0x7ffffff9c5c0) at ../librz/bin/bin.c:338
#15 0x00007ffff6c7d7db in rz_bin_open (bin=bin@entry=0x555555590eb0, file=file@entry=0x7fffffffe3c0 "POC.bin", opt=opt@entry=0x7ffffff9c5c0) at ../librz/bin/bin.c:230
#16 0x00007ffff7fa321e in rz_main_rz_bin (argc=<optimized out>, argv=0x7fffffffe088) at ../librz/main/rz-bin.c:1052
#17 0x00007ffff7db50b3 in __libc_start_main (main=0x555555555060 <main>, argc=0x3, argv=0x7fffffffe088, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe078) at ../csu/libc-start.c:308
#18 0x000055555555509e in _start ()
[ DESCRIPTION ]-----------------------------------------------------------------
The vector_free_elems function iterates over the RzVectors created for different
sections in the binary.
The RzVector->free callback function rz_bin_elf_section_free makes a call to
free() the RzBinElfSection->name member. With corrupted section headers, you
can overwrite this pointer and other objects in the heap.
https://github.com/rizinorg/rizin/blob/0e11486f36aa784b471d8d4ecf291a8d962b4c47/librz/util/vector.c#L54
https://github.com/rizinorg/rizin/blob/0e11486f36aa784b471d8d4ecf291a8d962b4c47/librz/bin/format/elf/elf_sections.c#L122
The POC below contains the pattern 0xacabacabacabacab at 0x9248 within the
section headers which is free'd by vector_free_elems.
[ POC ]-------------------------------------------------------------------------
Attaching as a base64 encoded zip (POC.zip) containing POC.bin
SHA256 Hashes
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I use rizin a lot and I am looking forward to seeing this fixed. Thanks!
- netspooky
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