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Message-ID: <20511243.IiplisyCjp@arcadia>
Date: Sun, 16 Oct 2016 20:52:34 +0200
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com, cve-assign@...re.org
Subject: mupdf: mujstest: global-buffer-overflow in main (jstest_main.c)
A note outside the blog post:
This issue does not affect any library, but it is only in the mujstest binary.
There aren't known applications which use mujstest, but if you have an
application or website which relies on mujstest you are invited to apply the
patch or use the newer package when it will be released. Thanks.
Description:
Mujstest, which is part of mupdf is a scriptable tester for mupdf + js.
A fuzzing revealed a global buffer overflow write.
The complete ASan output:
# mujstest $FILE
=================================================================
==2244==ERROR: AddressSanitizer: global-buffer-overflow on address
0x0000013c6140 at pc 0x000000473526 bp 0x7fff866f77d0 sp 0x7fff866f6f80
WRITE of size 1181 at 0x0000013c6140 thread T0
#0 0x473525 in __interceptor_strcpy /var/tmp/portage/sys-devel/llvm-3.8.0-
r3/work/llvm-3.8.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:547
#1 0x4f7910 in main /var/tmp/portage/app-
text/mupdf-1.9a/work/mupdf-1.9a/platform/x11/jstest_main.c:353:6
#2 0x7f3a6c18661f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
#3 0x41ade8 in _init (/usr/bin/mujstest+0x41ade8)
0x0000013c6140 is located 0 bytes to the right of global variable 'filename'
defined in 'platform/x11/jstest_main.c:15:13' (0x13c5d40) of size 1024
SUMMARY: AddressSanitizer: global-buffer-overflow /var/tmp/portage/sys-
devel/llvm-3.8.0-r3/work/llvm-3.8.0.src/projects/compiler-
rt/lib/asan/asan_interceptors.cc:547 in __interceptor_strcpy
Shadow bytes around the buggy address:
0x000080270bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080270be0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080270bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080270c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080270c10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x000080270c20: 00 00 00 00 00 00 00 00[f9]f9 f9 f9 f9 f9 f9 f9
0x000080270c30: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x000080270c40: f9 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
0x000080270c50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080270c60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080270c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
==2244==ABORTING
Affected version:
1.9a
Fixed version:
1.10 (not yet released)
Commit fix:
http://git.ghostscript.com/?p=mupdf.git;h=cfe8f35bca61056363368c343be36812abde0a06
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
N/A
Timeline:
2016-08-04: bug discovered
2016-08-05: bug reported to upstream
2016-09-22: upstream released a patch
2016-09-24: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2016/09/24/mupdf-mujstest-global-buffer-overflow-in-main-jstest_main-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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