Headline
CVE-2020-27800: Another heap buffer overflow in get_le32() · Issue #395 · upx/upx
A heap-based buffer over-read was discovered in the get_le32 function in bele.h in UPX 4.0.0 via a crafted Mach-O file.
==5614==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x624000007da0 at pc 0x000000757233 bp 0x7ffe125eb8e0 sp 0x7ffe125eb8d8
READ of size 4 at 0x624000007da0 thread T0
#0 0x757232 in get_le32(void const*) /src/upx-multi/src/./bele.h:164:12
#1 0x757232 in N_BELE_RTP::LEPolicy::get32(void const*) const /src/upx-multi/src/./bele_policy.h:192:18
#2 0x58a45e in Packer::get_te32(void const*) const /src/upx-multi/src/./packer.h:296:65
#3 0x58a45e in PackLinuxElf32::invert_pt_dynamic(N_Elf::Dyn<N_Elf::ElfITypes<LE16, LE32, LE32, LE32, LE32> > const*, unsignedint) /src/upx-multi/src/p_lx_elf.cpp:1610:32
#4 0x588a1e in PackLinuxElf32::PackLinuxElf32help1(InputFile*) /src/upx-multi/src/p_lx_elf.cpp:305:13
#5 0x5d6504 in PackLinuxElf32Le::PackLinuxElf32Le(InputFile*) /src/upx-multi/src/./p_lx_elf.h:395:9
#6 0x5d6504 in PackLinuxElf32x86::PackLinuxElf32x86(InputFile*) /src/upx-multi/src/p_lx_elf.cpp:4847:54
#7 0x5d6a4c in PackNetBSDElf32x86::PackNetBSDElf32x86(InputFile*) /src/upx-multi/src/p_lx_elf.cpp:4884:56
#8 0x6e4df0 in PackMaster::visitAllPackers(Packer* (*)(Packer*, void*), InputFile*, options_t const*, void*) /src/upx-multi/src/packmast.cpp:191:9
#9 0x6e9771 in PackMaster::getUnpacker(InputFile*) /src/upx-multi/src/packmast.cpp:248:18
#10 0x6e9771 in PackMaster::unpack(OutputFile*) /src/upx-multi/src/packmast.cpp:266:9
#11 0x7589f8 in do_one_file(char const*, char*) /src/upx-multi/src/work.cpp:160:12
#12 0x759f42 in do_files(int, int, char**) /src/upx-multi/src/work.cpp:271:13
#13 0x555afd in main /src/upx-multi/src/main.cpp:1538:5
#14 0x7fc6ddc5d83f in __libc_start_main /build/glibc-e6zv40/glibc-2.23/csu/../csu/libc-start.c:291
#15 0x41ce98 in _start (/out/upx-multi/upx-multi+0x41ce98)
0x624000007da2 is located 0 bytes to the right of 7330-byte region [0x624000006100,0x624000007da2)
allocated by thread T0 here:
#0 0x49519d in malloc (/out/upx-multi/upx-multi+0x49519d)
#1 0x5697b7 in MemBuffer::alloc(unsigned long long) /src/upx-multi/src/mem.cpp:194:42
SUMMARY: AddressSanitizer: heap-buffer-overflow /src/upx-multi/src/./bele.h:164:12 in get_le32(void const*)
Shadow bytes around the buggy address:
0x0c487fff8f60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c487fff8f70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c487fff8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c487fff8f90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c487fff8fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c487fff8fb0: 00 00 00 00[02]fa fa fa fa fa fa fa fa fa fa fa
0x0c487fff8fc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c487fff8fd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c487fff8fe0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c487fff8ff0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c487fff9000: 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
==5614==ABORTING
upx 4.0.0-git-8d1d605b3d8c+
UCL data compression library 1.03
zlib data compression library 1.2.8
LZMA SDK version 4.43
Copyright (C) 1996-2020 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1996-2020 Laszlo Molnar
Copyright (C) 2000-2020 John F. Reiser
Copyright (C) 2002-2020 Jens Medoch
Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
Copyright (C) 1999-2006 Igor Pavlov
UPX comes with ABSOLUTELY NO WARRANTY; for details type 'upx-multi -L'.