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Date: Sun, 29 Jan 2017 17:51:29 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: mp3splt: invalid free in free_options (options_manager.c)

Description:
mp3splt is a command line utility to split mp3 and ogg files without decoding.

A fuzz on it discovered an invalid free.

The complete ASan output:

# mp3splt -P -f -t 0.1 -a $FILE
==2631==ERROR: AddressSanitizer: attempting free on address which was not 
malloc()-ed: 0x000000d3ef65 in thread T0
    #0 0x4d3770 in free /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:47
    #1 0x50dbaa in free_options /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/options_manager.c:67:9
    #2 0x515623 in free_main_struct /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/data_manager.c:74:7
    #3 0x50ffa5 in process_confirmation_error /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/print_utils.c:266:7
    #4 0x51df29 in main /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/mp3splt.c:873:9
    #5 0x7f783aba361f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
    #6 0x41ad08 in _init (/usr/bin/mp3splt+0x41ad08)

AddressSanitizer can not describe address in more detail (wild memory access 
suspected).
SUMMARY: AddressSanitizer: bad-free /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:47 
in free
==2631==ABORTING

Affected version:
0.9.2

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/00130-mp3splt-badfree-free_options

Timeline:
2017-01-01: private report to upstream via mail
2017-01-29: public upstream report on sourceforge
2017-01-29: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2017/01/29/mp3splt-invalid-free-in-free_options-options_manager-c

-- 
Agostino Sarubbo
Gentoo Linux Developer

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