[<prev] [next>] [day] [month] [year] [list]
Message-ID: <55203.9275384857-sendEmail@localhost>
Date: Wed, 7 Jun 2017 12:53:43 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: ytnef: heap-based-buffer overflow in SwapWord (ytnef.c)
Description:
ytnef is Yeraze’s TNEF Stream Reader – for winmail.dat files.
The complete ASan output of the issue:
# ytnefprint $FILE
==22220==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000038 at pc 0x7ff75139d8eb bp 0x7ffeed684ad0 sp 0x7ffeed684ac8
READ of size 1 at 0x602000000038 thread T0
#0 0x7ff75139d8ea in SwapWord /tmp/ytnef-1.9.2/lib/ytnef.c:153:28
#1 0x7ff75139d8ea in TNEFDateHandler /tmp/ytnef-1.9.2/lib/ytnef.c:682
#2 0x7ff7513b4b47 in TNEFParse /tmp/ytnef-1.9.2/lib/ytnef.c:1184:15
#3 0x7ff7513b39d3 in TNEFParseFile /tmp/ytnef-1.9.2/lib/ytnef.c:1042:10
#4 0x508814 in main /tmp/ytnef-1.9.2/ytnefprint/main.c:80:9
#5 0x7ff7504c978f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#6 0x419c38 in _start (/usr/bin/ytnefprint+0x419c38)
0x602000000038 is located 0 bytes to the right of 8-byte region [0x602000000030,0x602000000038)
allocated by thread T0 here:
#0 0x4cf7e0 in calloc /tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.0/work/compiler-rt-4.0.0.src/lib/asan/asan_malloc_linux.cc:74
#1 0x7ff7513b472a in TNEFParse /tmp/ytnef-1.9.2/lib/ytnef.c:1154:12
#2 0x7ff7513b39d3 in TNEFParseFile /tmp/ytnef-1.9.2/lib/ytnef.c:1042:10
#3 0x508814 in main /tmp/ytnef-1.9.2/ytnefprint/main.c:80:9
#4 0x7ff7504c978f 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/ytnef-1.9.2/lib/ytnef.c:153:28 in SwapWord
Shadow bytes around the buggy address:
0x0c047fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c047fff8000: fa fa fd fa fa fa 00[fa]fa fa fa fa fa fa fa fa
0x0c047fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8050: 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
==22220==ABORTING
Affected version:
1.9.2
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-9471
Reproducer:
https://github.com/asarubbo/poc/blob/master/00243-ytnef-heapoverflow-SwapWord
Timeline:
2017-03-27: bug discovered and reported to upstream
2017-05-24: blog post about the issue
2017-06-07: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/05/24/ytnef-heap-based-buffer-overflow-in-swapword-ytnef-c/
--
Agostino Sarubbo
Gentoo Linux Developer
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
