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Date: Thu, 7 Sep 2017 15:32:58 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: aacplusenc: NULL pointer dereference in DeleteBitBuffer (bitbuffer.c)
Description:
aacplusenc is an High-Efficiency AAC (AAC+) Encoder.
The complete ASan output of the issue:
# aacplusenc $FILE out.aac 32
*************************************************************
* Enhanced aacPlus Encoder
* Build Aug 30 2017, 14:40:49
* Matteo Croce
*************************************************************
input file 101.crashes.wav:
sr = 48000, nc = 1
output file out.aac:
br = 32000 sr-OUT = 48000 nc-OUT = 1
ASAN:DEADLYSIGNAL
=================================================================
==21496==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000030 (pc 0x000000562e2f bp 0x7ffc2ec32430 sp 0x7ffc2ec32430 T0)
==21496==The signal is caused by a WRITE memory access.
==21496==Hint: address points to the zero page.
#0 0x562e2e in DeleteBitBuffer /var/tmp/portage/media-sound/aacplusenc-0.17.5/work/aacplusenc/libbitbuf/bitbuffer.c:97:23
#1 0x50d909 in AacEncClose /var/tmp/portage/media-sound/aacplusenc-0.17.5/work/aacplusenc/libaacenc/aacenc.c:469:5
#2 0x50c0df in main /var/tmp/portage/media-sound/aacplusenc-0.17.5/work/aacplusenc/aacplusenc.c:536:2
#3 0x7f0e4c21b680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#4 0x419e78 in _init (/usr/bin/aacplusenc+0x419e78)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /var/tmp/portage/media-sound/aacplusenc-0.17.5/work/aacplusenc/libbitbuf/bitbuffer.c:97:23 in DeleteBitBuffer
==21496==ABORTING
Affected version:
0.17.5
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-14181
Reproducer:
https://github.com/asarubbo/poc/blob/master/00332-aacplusenc-NULLptr-DeleteBitBuffer
Timeline:
2017-08-31: bug discovered and reported to upstream
2017-09-07: blog post about the issue
2017-09-07: 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.
Permalink:
https://blogs.gentoo.org/ago/2017/09/07/aacplusenc-null-pointer-dereference-in-deletebitbuffer-bitbuffer-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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