mp3gain: invalid memory write in copy_mp (mpglibDBL/interface.c)

Description:
mp3gain is a program to analyze and adjust MP3 files to same volume.

The fuzz was done via the aacgain command-line tool which uses mp3gain which bundles an old-modified version of mpg123 called mpglibDBL.
The upstream project seems to be dead, so the issue wasn’t communicated to them.

The complete ASan output of the issue:

# aacgain -f $FILE
ASAN:DEADLYSIGNAL
=================================================================
==15053==ERROR: AddressSanitizer: SEGV on unknown address 0x104db559357d (pc 0x7f06b1457af7 bp 0x7ffed0c702a0 sp 0x7ffed0c6fa30 T0)
    #0 0x7f06b1457af6  (/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/libasan.so.3+0x5caf6)
    #1 0x8a8ad0 in copy_mp /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/interface.c:188
    #2 0x8ad77e in decodeMP3 /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/interface.c:538
    #3 0x43e767 in main /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mp3gain.c:2262
    #4 0x7f06b0770680 in __libc_start_main (/lib64/libc.so.6+0x20680)
    #5 0x4426c8 in _start (/usr/bin/aacgain+0x4426c8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/libasan.so.3+0x5caf6) 
==15053==ABORTING

Affected version:
1.5.2

Fixed version:
N/A

Commit fix:
N/A

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

CVE:
CVE-2017-14412

Reproducer:
https://github.com/asarubbo/poc/blob/master/00352-aacgain-invalidwrite-copy_mp

Timeline:
2017-08-28: bug discovered
2017-09-08: blog post about the issue
2017-09-13: CVE Assigned

Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported by the Core Infrastructure Initiative.

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mp3gain: invalid memory write in copy_mp (mpglibDBL/interface.c)

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