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:
ytnef: heap-based buffer overflow in DecompressRTF (ytnef.c)
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