oss-security - libming: listmp3: divide-by-zero in printMP3Headers (listmp3.c)

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Date: Wed, 09 Nov 2016 15:49:31 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: libming: listmp3: divide-by-zero in printMP3Headers (listmp3.c)

If it is suitable for a CVE please assign one. Thanks.

Description:
libming is a Flash (SWF) output library. It can be used from PHP, Perl, Ruby, 
Python, C, C++, Java, and probably more on the way..

A fuzzing revealed a divide by zero in listmp3. The bug does not reside in any 
shared object but if you have a web application that calls directly the 
listmp3 binary to parse untrusted mp3, then you are affected.

The complete ASan output:

# listmp3 $FILE
ASAN:DEADLYSIGNAL
=================================================================
==29561==ERROR: AddressSanitizer: FPE on unknown address 0x0000004f19e8 (pc 
0x0000004f19e8 bp 0x000000000000 sp 0x7ffdf0ab6340 T0)
    #0 0x4f19e7 in printMP3Headers /var/tmp/portage/media-
libs/ming-0.4.7/work/ming-0_4_7/util/listmp3.c:172:54
    #1 0x4f1bee in main /var/tmp/portage/media-
libs/ming-0.4.7/work/ming-0_4_7/util/listmp3.c:191:3
    #2 0x7f49407a361f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
    #3 0x418ae8 in getenv (/usr/bin/listmp3+0x418ae8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE /var/tmp/portage/media-
libs/ming-0.4.7/work/ming-0_4_7/util/listmp3.c:172:54 in printMP3Headers
==29561==ABORTING

Affected version:
0.4.7

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/00045-libming-fpe-printMP3Headers

Timeline:
2016-08-13: bug discovered
2016-10-20: bug reported to upstream
2016-11-09: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2016/11/09/libming-listmp3-divide-by-zero-in-printmp3headers-listmp3-c

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