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Message-ID: <999555.97808318-sendEmail@localhost>
Date: Tue, 9 May 2017 08:22:55 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: lrzip: heap-based buffer overflow write in read_1g (stream.c)
Description:
lrzip is a compression utility that excels at compressing large files.
The complete ASan output of the issue:
# lrzip -t $FILE
==25584==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000ef33 at pc 0x00000045246e bp 0x7ffd881d4970 sp 0x7ffd881d4120
WRITE of size 8 at 0x60200000ef33 thread T0
#0 0x45246d in read /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:765
#1 0x537ce1 in read_1g /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:731:9
#2 0x53e349 in read_buf /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:774:8
#3 0x53e349 in fill_buffer /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1648
#4 0x53e349 in read_stream /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1755
#5 0x5307fc in read_vchars /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:79:6
#6 0x5307fc in unzip_match /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:208
#7 0x5307fc in runzip_chunk /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:329
#8 0x5307fc in runzip_fd /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:382
#9 0x519b41 in decompress_file /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/lrzip.c:826:6
#10 0x511074 in main /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/main.c:669:4
#11 0x7f02ed48f78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#12 0x41abf8 in _init (/usr/bin/lrzip+0x41abf8)
0x60200000ef33 is located 0 bytes to the right of 3-byte region [0x60200000ef30,0x60200000ef33)
allocated by thread T0 here:
#0 0x4d39b8 in malloc /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:64
#1 0x53e2ab in fill_buffer /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1643:10
#2 0x53e2ab in read_stream /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1755
#3 0x5307fc in read_vchars /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:79:6
#4 0x5307fc in unzip_match /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:208
#5 0x5307fc in runzip_chunk /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:329
#6 0x5307fc in runzip_fd /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:382
#7 0x519b41 in decompress_file /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/lrzip.c:826:6
#8 0x511074 in main /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/main.c:669:4
#9 0x7f02ed48f78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
SUMMARY: AddressSanitizer: heap-buffer-overflow /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:765 in read
Shadow bytes around the buggy address:
0x0c047fff9d90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9da0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9db0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9dc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9dd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c047fff9de0: fa fa fa fa fa fa[03]fa fa fa fd fd fa fa fd fa
0x0c047fff9df0: fa fa fd fd fa fa 04 fa fa fa 03 fa fa fa 05 fa
0x0c047fff9e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff9e30: 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
==25584==ABORTING
Affected version:
0.631
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8844
Reproducer:
https://github.com/asarubbo/poc/blob/master/00232-lrzip-heapoverflow-read_1g
Timeline:
2017-03-24: bug discovered and reported to upstream
2017-05-07: blog post about the issue
2017-05-08: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/05/07/lrzip-heap-based-buffer-overflow-write-in-read_1g-stream-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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