oss-security - mp3splt: NULL pointer dereference in main (mp3splt.c)

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Date: Sun, 29 Jan 2017 17:52:34 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: mp3splt: NULL pointer dereference in main (mp3splt.c)

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

A fuzz on it discovered a NULL pointer access.

The complete ASan output:

# mp3splt -P -f -t 0.1 -a $FILE
==3081==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 
0x00000046dbd9 bp 0x7ffc4cdabdb0 sp 0x7ffc4cdab520 T0)
==3081==The signal is caused by a READ memory access.
==3081==Hint: address points to the zero page.
    #0 0x46dbd8 in __interceptor_strncmp /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-
rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:302
    #1 0x51d727 in main /tmp/portage/media-
sound/mp3splt-2.6.2/work/mp3splt-2.6.2/src/mp3splt.c:906:11
    #2 0x7f8512cf061f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
    #3 0x41ad08 in _init (/usr/bin/mp3splt+0x41ad08)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-
rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:302 in 
__interceptor_strncmp
==3081==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/00128-mp3splt-nullptr-main

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-null-pointer-dereference-in-mp3splt-c

-- 
Agostino Sarubbo
Gentoo Linux Developer

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