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Message-ID: <1840743.uk7qesaqqd@willoughby>
Date: Thu, 22 Sep 2016 17:47:16 +0200
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: mupdf: use-after-free in pdf_to_num (pdf-object.c)
If it is suitable for a CVE please assign one.
Thanks.
Description:
mupdf is a lightweight PDF viewer and toolkit written in portable C.
A fuzzing through mutool revealed a use-after-free.
The complete ASan output:
# mutool info $FILE
==5430==ERROR: AddressSanitizer: heap-use-after-free on address 0x60300000ea42
at pc 0x7fbc4c3824e5 bp 0x7ffee68ead70 sp 0x7ffee68ead68
READ of size 1 at 0x60300000ea42 thread T0
#0 0x7fbc4c3824e4 in pdf_to_num /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/pdf/pdf-object.c:375:35
#1 0x53f042 in gatherfonts /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/pdfinfo.c:259:46
#2 0x53f042 in gatherresourceinfo /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/pdfinfo.c:595
#3 0x53913a in gatherpageinfo /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/pdfinfo.c:661:2
#4 0x53913a in showinfo /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/pdfinfo.c:957
#5 0x537d46 in pdfinfo_info /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/pdfinfo.c:1029:3
#6 0x537d46 in pdfinfo_main /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/pdfinfo.c:1077
#7 0x4f8ace in main /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/tools/mutool.c:104:12
#8 0x7fbc4ae1f61f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
#9 0x41f9c8 in _init (/usr/bin/mutool+0x41f9c8)
0x60300000ea42 is located 2 bytes inside of 24-byte region
[0x60300000ea40,0x60300000ea58)
freed by thread T0 here:
#0 0x4c6c10 in free /var/tmp/portage/sys-devel/llvm-3.8.0-
r3/work/llvm-3.8.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:38
#1 0x7fbc4bf33830 in fz_free /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/fitz/memory.c:187:2
previously allocated by thread T0 here:
#0 0x4c6f18 in malloc /var/tmp/portage/sys-devel/llvm-3.8.0-
r3/work/llvm-3.8.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:52
#1 0x7fbc4bf2a86f in do_scavenging_malloc /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/fitz/memory.c:17:7
#2 0x7fbc4bf2a86f in fz_malloc /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/fitz/memory.c:57
#3 0x7fbc4c37f94d in pdf_new_indirect /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/pdf/pdf-object.c:186:8
SUMMARY: AddressSanitizer: heap-use-after-free /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/source/pdf/pdf-object.c:375:35 in pdf_to_num
Shadow bytes around the buggy address:
0x0c067fff9cf0: fd fd fa fa fd fd fd fa fa fa fd fd fd fa fa fa
0x0c067fff9d00: fd fd fd fd fa fa fd fd fd fa fa fa fd fd fd fa
0x0c067fff9d10: fa fa fd fd fd fd fa fa fd fd fd fa fa fa fd fd
0x0c067fff9d20: fd fa fa fa fd fd fd fd fa fa fd fd fd fa fa fa
0x0c067fff9d30: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa
=>0x0c067fff9d40: fa fa 00 00 00 fa fa fa[fd]fd fd fa fa fa fd fd
0x0c067fff9d50: fd fd fa fa 00 00 00 fa fa fa 00 00 00 fa fa fa
0x0c067fff9d60: 00 00 00 fa fa fa 00 00 00 00 fa fa 00 00 00 fa
0x0c067fff9d70: fa fa 00 00 00 fa fa fa 00 00 00 06 fa fa 00 00
0x0c067fff9d80: 01 fa fa fa 00 00 05 fa fa fa 00 00 00 fa fa fa
0x0c067fff9d90: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 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
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
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
==5430==ABORTING
Affected version:
1.9a
Fixed version:
1.10 (not yet released)
Commit fix:
http://git.ghostscript.com/?p=mupdf.git;h=1e03c06456d997435019fb3526fa2d4be7dbc6ec
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
Timeline:
2016-08-05: bug discovered
2016-08-05: bug reported privately to upstream
2016-09-22: upstream released a patch
2016-09-22: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2016/09/22/mupdf-use-after-free-in-pdf_to_num-pdf-object-c
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