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Date: Mon, 16 Jan 2017 12:00:26 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: jasper: invalid memory read in jas_matrix_asl (jas_seq.c)

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.

Another round of fuzzing shows that a crafted image causes an invalid memory 
read.

The complete ASan output:

# imginfo -f $FILE
==26941==ERROR: AddressSanitizer: SEGV on unknown address 0x62c80000a400 (pc 
0x7f28c74e48ee bp 0x7ffcececdb70 sp 0x7ffcececdaf0 T0)
==26941==The signal is caused by a READ memory access.
    #0 0x7f28c74e48ed in jas_matrix_asl /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/base/jas_seq.c:376:11
    #1 0x7f28c7545f0e in jpc_dec_tiledecode /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_dec.c:1107:6
    #2 0x7f28c7536cdf in jpc_dec_process_sod /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_dec.c:658:7
    #3 0x7f28c75406b3 in jpc_dec_decode /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_dec.c:425:10
    #4 0x7f28c75406b3 in jpc_decode /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_dec.c:262
    #5 0x7f28c74a2b84 in jas_image_decode /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/base/jas_image.c:444:16
    #6 0x509eed in main /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/appl/imginfo.c:219:16
    #7 0x7f28c65aa61f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
    #8 0x419978 in _init (/usr/bin/imginfo+0x419978)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/base/jas_seq.c:376:11 
in jas_matrix_asl
==26941==ABORTING

Affected version:
1.900.27

Fixed version:
N/A

Commit fix:
N/A

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
N/A

Reproducer:
https://github.com/asarubbo/poc/blob/master/00053-jasper-invalidread-jas_matrix_asl

Timeline:
2016-11-20: bug discovered and reported upstream
2017-01-16: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2017/01/16/jasper-invalid-memory-read-in-jas_matrix_asl-jas_seq-c

--
Agostino

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