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Date: Wed, 6 Sep 2017 19:02:56 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: libarchive: heap-based buffer overflow in xml_data (archive_read_support_format_xar.c)
Description:
libarchive is a multi-format archive and compression library.
The complete ASan output of the issue:
# bsdtar -t -f $FILE
==13144==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x631000038800 at pc 0x7fb1c808f650 bp 0x7ffdd1b40990 sp 0x7ffdd1b40988
READ of size 1 at 0x631000038800 thread T0
#0 0x7fb1c808f64f in xml_data /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read_support_format_xar.c
#1 0x7fb1c808f64f in expat_data_cb /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read_support_format_xar.c:3230
#2 0x7fb1c697c3b6 in _init /var/tmp/portage/dev-libs/expat-2.2.1/work/expat-2.2.1/lib/xmlparse.c:2960
#3 0x7fb1c697cb9b in _init /var/tmp/portage/dev-libs/expat-2.2.1/work/expat-2.2.1/lib/xmlparse.c:2418
#4 0x7fb1c697e988 in _init /var/tmp/portage/dev-libs/expat-2.2.1/work/expat-2.2.1/lib/xmlparse.c:4366
#5 0x7fb1c697f137 in _init /var/tmp/portage/dev-libs/expat-2.2.1/work/expat-2.2.1/lib/xmlparse.c:4089
#6 0x7fb1c6980fc7 in XML_ParseBuffer /var/tmp/portage/dev-libs/expat-2.2.1/work/expat-2.2.1/lib/xmlparse.c:1915
#7 0x7fb1c807d62a in expat_read_toc /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read_support_format_xar.c:3273:8
#8 0x7fb1c807d62a in read_toc /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read_support_format_xar.c:584
#9 0x7fb1c807d62a in xar_read_header /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read_support_format_xar.c:677
#10 0x7fb1c7f728ed in _archive_read_next_header2 /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read.c:648:7
#11 0x7fb1c7f72590 in _archive_read_next_header /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read.c:686:8
#12 0x51483f in read_archive /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/tar/read.c:260:7
#13 0x513d89 in tar_mode_t /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/tar/read.c:94:2
#14 0x50eaae in main /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/tar/bsdtar.c:858:3
#15 0x7fb1c6ffe680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#16 0x41c628 in _init (/usr/bin/bsdtar+0x41c628)
0x631000038800 is located 0 bytes to the right of 65536-byte region [0x631000028800,0x631000038800)
allocated by thread T0 here:
#0 0x4d1fd8 in malloc /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/asan_malloc_linux.cc:66
#1 0x7fb1c69811f5 in XML_GetBuffer /var/tmp/portage/dev-libs/expat-2.2.1/work/expat-2.2.1/lib/xmlparse.c:2004
SUMMARY: AddressSanitizer: heap-buffer-overflow /var/tmp/portage/app-arch/libarchive-3.3.2/work/libarchive-3.3.2/libarchive/archive_read_support_format_xar.c in xml_data
Shadow bytes around the buggy address:
0x0c627ffff0b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627ffff0c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627ffff0d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627ffff0e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c627ffff0f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c627ffff100:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627ffff110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627ffff120: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627ffff130: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627ffff140: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c627ffff150: 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
==13144==ABORTING
Affected version:
3.3.2
Fixed version:
N/A
Commit fix:
https://github.com/libarchive/libarchive/commit/fa7438a0ff4033e4741c807394a9af6207940d71
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-14166
Reproducer:
https://github.com/asarubbo/poc/blob/master/00316-libarchive-heapoverflow-archive_read_support_format_xar
Timeline:
2017-08-15: bug discovered and reported to upstream
2017-09-05: upstream released a patch
2017-09-06: blog post about the issue
2017-09-06: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported by the Core Infrastructure Initiative.
Permalink:
https://blogs.gentoo.org/ago/2017/09/06/libarchive-heap-based-buffer-overflow-in-xml_data-archive_read_support_format_xar-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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