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Message-ID: <816566.780300008-sendEmail@localhost>
Date: Mon, 1 May 2017 11:27:43 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: rzip: heap-based buffer overflow in read_buf (stream.c)
Description:
rzip is a compression program for large files.
A crafted archive causes an heap overflow write.
The complete ASan output:
# rzip -k -f -d $FILE
Read of length -1325400064 failed - Bad address
=================================================================
==5655==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000efb1 at pc 0x00000045117e bp 0x7ffc9d9f6980 sp 0x7ffc9d9f6130
WRITE of size 187 at 0x60200000efb1 thread T0
#0 0x45117d 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 0x52b8c6 in read_buf /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/stream.c:153:8
#2 0x526d44 in fill_buffer /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/stream.c:406:6
#3 0x526d44 in read_stream /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/stream.c:464
#4 0x518ed9 in unzip_literal /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/runzip.c:75:2
#5 0x518ed9 in runzip_chunk /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/runzip.c:156
#6 0x518ed9 in runzip_fd /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/runzip.c:184
#7 0x51bbfd in decompress_file /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/main.c:176:2
#8 0x51bbfd in main /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/main.c:334
#9 0x7f4dd0db578f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#10 0x419908 in _init (/usr/bin/rzip+0x419908)
0x60200000efb1 is located 0 bytes to the right of 1-byte region [0x60200000efb0,0x60200000efb1)
allocated by thread T0 here:
#0 0x4d26c8 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 0x5269e0 in fill_buffer /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/stream.c:402:25
#2 0x5269e0 in read_stream /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/stream.c:464
#3 0x518ed9 in unzip_literal /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/runzip.c:75:2
#4 0x518ed9 in runzip_chunk /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/runzip.c:156
#5 0x518ed9 in runzip_fd /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/runzip.c:184
#6 0x51bbfd in decompress_file /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/main.c:176:2
#7 0x51bbfd in main /tmp/portage/app-arch/rzip-2.1-r2/work/rzip-2.1/main.c:334
#8 0x7f4dd0db578f 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:
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 fa fa fa fa fa fa fa fa fa fa
=>0x0c047fff9df0: fa fa fa fa fa fa[01]fa fa fa fd fd fa fa 00 05
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
0x0c047fff9e40: 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
==5655==ABORTING
Affected version:
2.1
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8364
Reproducer:
https://github.com/asarubbo/poc/blob/master/00277-rzip-heap-overflow-read_buf.rz
Timeline:
2017-04-11: bug discovered and reported to upstream
2017-04-29: blog post about the issue
2017-04-30: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/29/rzip-heap-based-buffer-overflow-in-read_buf-stream-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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