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Date: Mon, 16 Jan 2017 11:57:55 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: jasper: invalid memory write in dec_clnpass (jpc_t1dec.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 
write.

The complete ASan output:

# imginfo -f $FILE
==24746==ERROR: AddressSanitizer: SEGV on unknown address 0x7ef94fe46c88 (pc 
0x7efd4faa510d bp 0x7ffde2235af0 sp 0x7ffde2235900 T0)
==24746==The signal is caused by a WRITE memory access.
    #0 0x7efd4faa510c in dec_clnpass /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_t1dec.c:869:4
    #1 0x7efd4faa510c in jpc_dec_decodecblk /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_t1dec.c:283
    #2 0x7efd4fa9ef89 in jpc_dec_decodecblks /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_t1dec.c:177:11
    #3 0x7efd4fa394f1 in jpc_dec_tiledecode /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_dec.c:1085:6
    #4 0x7efd4fa2acdf 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
    #5 0x7efd4fa346b3 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
    #6 0x7efd4fa346b3 in jpc_decode /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/libjasper/jpc/jpc_dec.c:262
    #7 0x7efd4f996b84 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
    #8 0x509eed in main /tmp/portage/media-
libs/jasper-1.900.27/work/jasper-1.900.27/src/appl/imginfo.c:219:16
    #9 0x7efd4ea9e61f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
    #10 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/jpc/jpc_t1dec.c:869:4 
in dec_clnpass
==24746==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/00055-jasper-invalidwrite-dec_clnpass

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-write-in-dec_clnpass-jpc_t1dec-c

--
Agostino

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