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Date: Thu, 7 Sep 2017 15:32:58 +0000
From: "Agostino Sarubbo" <>
To: "" <>
Subject: aacplusenc: NULL pointer dereference in DeleteBitBuffer (bitbuffer.c)

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                                                                                                                                                                             
==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

Affected version:

Fixed version:

Commit fix:

This bug was discovered by Agostino Sarubbo of Gentoo.



2017-08-31: bug discovered and reported to upstream
2017-09-07: blog post about the issue
2017-09-07: CVE assigned

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.


Agostino Sarubbo
Gentoo Linux Developer

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