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Message-ID: <844121.337493078-sendEmail@localhost>
Date: Tue, 9 May 2017 08:19:51 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: lrzip: NULL pointer dereference in bufRead::get (libzpaq.h)
Description:
lrzip is a compression utility that excels at compressing large files.
The complete ASan output of the issue:
# lrzip -t $FILE
==24966==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000005e7caa bp 0x7f7c755a58d0 sp 0x7f7c755a5870 T2)
==24966==The signal is caused by a READ memory access.
==24966==Hint: address points to the zero page.
#0 0x5e7ca9 in bufRead::get() /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.h:485:24
#1 0x5856f1 in libzpaq::Decompresser::findBlock(double*) /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.cpp:1236:21
#2 0x55f79a in libzpaq::decompress(libzpaq::Reader*, libzpaq::Writer*) /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.cpp:1363:12
#3 0x55f4e2 in zpaq_decompress /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.h:538:2
#4 0x54b3a4 in zpaq_decompress_buf /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:453:2
#5 0x54b3a4 in ucompthread /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1534
#6 0x7f81b7a434a3 in start_thread /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/nptl/pthread_create.c:333
#7 0x7f81b6d6e66c in clone /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:109
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.h:485:24 in bufRead::get()
Thread T2 created by T0 here:
#0 0x42d49d in pthread_create /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:245
#1 0x53e70f in create_pthread /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:133:6
#2 0x53e70f in fill_buffer /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1673
#3 0x53e70f in read_stream /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1755
#4 0x531075 in unzip_literal /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:162:16
#5 0x531075 in runzip_chunk /tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:320
#6 0x531075 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 0x7f81b6ca778f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
==24966==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-2017-8847
Reproducer:
https://github.com/asarubbo/poc/blob/master/00229-lrzip-nullptr-bufRead-get
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-null-pointer-dereference-in-bufreadget-libzpaq-h/
--
Agostino Sarubbo
Gentoo Linux Developer
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