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Message-ID: <998404.854533391-sendEmail@localhost>
Date: Wed, 7 Jun 2017 12:56:02 +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 DecompressRTF (ytnef.c)
Description:
ytnef is Yeraze’s TNEF Stream Reader – for winmail.dat files.
The complete ASan output of the issue:
# ytnefprint $FILE
==22808==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61800000039e at pc 0x7f6b57c2fcb8 bp 0x7ffd8ca179d0 sp 0x7ffd8ca179c8
READ of size 1 at 0x61800000039e thread T0
#0 0x7f6b57c2fcb7 in DecompressRTF /tmp/ytnef-1.9.2/lib/ytnef.c:1549:31
#1 0x7f6b57c20195 in MAPIPrint /tmp/ytnef-1.9.2/lib/ytnef.c:1417:39
#2 0x508f50 in PrintTNEF /tmp/ytnef-1.9.2/ytnefprint/main.c:169:5
#3 0x50882e in main /tmp/ytnef-1.9.2/ytnefprint/main.c:84:5
#4 0x7f6b56d3f78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#5 0x419c38 in _start (/usr/bin/ytnefprint+0x419c38)
0x61800000039e is located 0 bytes to the right of 798-byte region [0x618000000080,0x61800000039e)
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 0x7f6b57c1a527 in TNEFFillMapi /tmp/ytnef-1.9.2/lib/ytnef.c:513:26
#2 0x7f6b57c15384 in TNEFMapiProperties /tmp/ytnef-1.9.2/lib/ytnef.c:396:7
#3 0x7f6b57c2ab47 in TNEFParse /tmp/ytnef-1.9.2/lib/ytnef.c:1184:15
#4 0x7f6b57c299d3 in TNEFParseFile /tmp/ytnef-1.9.2/lib/ytnef.c:1042:10
#5 0x508814 in main /tmp/ytnef-1.9.2/ytnefprint/main.c:80:9
#6 0x7f6b56d3f78f 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:1549:31 in DecompressRTF
Shadow bytes around the buggy address:
0x0c307fff8020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff8030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff8040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff8050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c307fff8060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c307fff8070: 00 00 00[06]fa fa fa fa fa fa fa fa fa fa fa fa
0x0c307fff8080: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c307fff8090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c307fff80a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c307fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c307fff80c0: 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
==22808==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-2017-9474
Reproducer:
https://github.com/asarubbo/poc/blob/master/00244-ytnef-heapoverflow-DecompressRTF
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-decompressrtf-ytnef-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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