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Date: Mon, 16 Jan 2017 11:56:08 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: jasper: multiple crashes with UBSAN

Description:
jasper is an open-source initiative to provide a free software-based reference 
implementation of the codec specified in the JPEG-2000 Part-1 standard.

With the undefined behavior sanitizer enabled, jasper crashes showing some 
left shift and some signed integer overflow.

Affected version / Tested on:
1.900.17
Fixed version:
N/A
Commit fix:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00017-jasper-leftshift-jas_math_h
Relevant part of the stacktrace:

# imginfo -f $FILE
/tmp/portage/media-
libs/jasper-1.900.17/work/jasper-1.900.17/src/libjasper/include/jasper/jas_math.h:156:11: 
runtime error: left shift of negative value -185

#################################################

Affected version / Tested on:
1.900.17
Fixed version:
N/A
Commit fix:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00018-jasper-signedintoverflow-jpc_dec_c
Relevant part of the stacktrace:

# imginfo -f $FILE
/tmp/portage/media-
libs/jasper-1.900.17/work/jasper-1.900.17/src/libjasper/jpc/jpc_dec.c:1838:9: 
runtime error: signed integer overflow: -64356352 * 6359082673847140352 cannot 
be represented in type 'long'

#################################################

Affected version / Tested on:
1.900.17
Fixed version:
N/A
Commit fix:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00019-jasper-leftshift-jpc_dec_c
Relevant part of the stacktrace:

# imginfo -f $FILE
/tmp/portage/media-
libs/jasper-1.900.17/work/jasper-1.900.17/src/libjasper/jpc/jpc_dec.c:1819:40: 
runtime error: shift exponent 117 is too large for 64-bit type 'jpc_fix_t' 
(aka 'long')

#################################################

Affected version / Tested on:
1.900.17
Fixed version:
N/A
Commit fix:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00022-jasper-signedintoverflow-jpc_tsfb_c
Relevant part of the stacktrace:

# imginfo -f $FILE
/tmp/portage/media-
libs/jasper-1.900.17/work/jasper-1.900.17/src/libjasper/jpc/jpc_tsfb.c:233:35: 
runtime error: signed integer overflow: 2013306369 + 251691968 cannot be 
represented in type 'int'

#################################################

Affected version / Tested on:
1.900.17
Fixed version:
N/A
Commit fix:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00030-jasper-leftshift-jp2_dec_c
Relevant part of the stacktrace:

# imginfo -f $FILE
/tmp/portage/media-
libs/jasper-1.900.17/work/jasper-1.900.17/src/libjasper/jp2/jp2_dec.c:485:49: 
runtime error: left shift of negative value -26
Credit:
These bugs were discovered by Agostino Sarubbo of Gentoo.

Timeline:
2016-10-28: bug discovered and reported to upstream
2017-01-16: blog post about the issues

Note:
These bugs were found with American Fuzzy Lop.

Permalink:
http://blogs.gentoo.org/ago/2017/01/16/jasper-multiple-crashes-with-ubsan/

--
Agostino

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