invalid memory read in iw_get_ui16le (imagew-util.c)

[asarubbo]

On 1.3.1:

# imagew $FILE /tmp/out -outfmt bmp
==29040==ERROR: AddressSanitizer: SEGV on unknown address 0x60b00a000086 (pc 0x7f693a6b6a30 bp 0x7ffc6ae53710 sp 0x7ffc6ae536f0 T0)                  
==29040==The signal is caused by a READ memory access.                                                                                               
    #0 0x7f693a6b6a2f in iw_get_ui16le /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-util.c:405:23              
    #1 0x7f693a6b6a2f in iw_get_ui16_e /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-util.c:435                 
    #2 0x7f693a67d008 in iwjpeg_scan_exif_ifd /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-jpeg.c:130:14       
    #3 0x7f693a67d008 in iwjpeg_scan_exif /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-jpeg.c:182              
    #4 0x7f693a67d008 in iwjpeg_read_saved_markers /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-jpeg.c:205     
    #5 0x7f693a67d008 in iw_read_jpeg_file /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-jpeg.c:430             
    #6 0x7f693a5ed21d in iw_read_file_by_fmt /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-allfmts.c:43:12      
    #7 0x510184 in iwcmd_run /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-cmd.c:1191:6                         
    #8 0x50c1a6 in iwcmd_main /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-cmd.c:3018:7                        
    #9 0x50c1a6 in main /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-cmd.c:3067                                
    #10 0x7f69395f6680 in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289                          
    #11 0x41b048 in _init (/usr/bin/imagew+0x41b048)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /var/tmp/portage/media-gfx/imageworsener-1.3.1/work/imageworsener-1.3.1/src/imagew-util.c:405:23 in iw_get_ui16le
==29040==ABORTING

Reproducer:
https://github.com/asarubbo/poc/blob/master/00281-imageworsener-invalidread-iw_get_ui16le

[jsummers]

Should be fixed by commit b45cb1b.

It now fails with the incorrect error message "Improper call to JPEG library in state 201". I'm working on that.

[rshariffdeen]

CVE-2017-9204 has been assigned