[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20170930183612.mkgwgygmi7qri4wb@bogon.m.sigxcpu.org>
Date: Sat, 30 Sep 2017 20:36:12 +0200
From: Guido Günther <agx@...xcpu.org>
To: 连一汉 <lianyihan@....cn>
Cc: oss-security@...ts.openwall.com
Subject: Re: CVE-2017-14160: libvorbis-1.3.5
bark_noise_hybridmp() integer signedness bug
Hi,
On Thu, Sep 21, 2017 at 06:27:15AM +0000, 连一汉 wrote:
> Hi,
>
> I’m a security researcher of Qihoo 360 GearTeam.
> My partner Zhibin Hu and I found a vulnerability of libvorbis-1.3.5.
> And we have applied for CVE-2017-14160 of this vulnerability.
> ================== test command ====================
>
> ffmpeg –i poc.mp4 –y 1.mkv
Where can the reproducer for this be found? Can you attach it to
https://gitlab.xiph.org/xiph/vorbis/issues/2330
Cheers,
-- Guido
> // libvorbis-1.3.5 has been compiled into ffmpeg static.
>
> ================= needed version ====================
>
> I compile it as https://github.com/google/oss-fuzz/blob/master/projects/ffmpeg/build.sh
>
> This is the problem of libvorbis-1.3.5, and I tried libvorbis in ubuntu repo, it could also trigger this vul or bug.
>
> =================== crash info ======================
>
> (gdb) bt
> #0 0x0000000001f95afd in bark_noise_hybridmp (n=256, b=0x32cd940, f=0x32e5010, noise=0x32f7ed0, offset=140, fixed=-1) at psy.c:630
>
> #1 0x0000000001f95430 in _vp_noisemask (p=0x32aa820, logmdct=0x32e5010, logmask=0x32f7ed0) at psy.c:705
> #2 0x0000000001facac9 in mapping0_forward (vb=0x329cfb0) at mapping0.c:417
> #3 0x0000000001f92c9e in vorbis_analysis (vb=0x329cfb0, op=0x0) at analysis.c:46
> #4 0x0000000000bc2725 in libvorbis_encode_frame (avctx=0x329ca00, avpkt=0x32ab540, frame=0x32e4400, got_packet_ptr=0x7fffffffdbf4) at libavcodec/libvorbisenc.c:311
> #5 0x00000000009e5717 in avcodec_encode_audio2 (avctx=0x329ca00, avpkt=0x32ab540, frame=0x32e4400, got_packet_ptr=0x7fffffffdbf4)at libavcodec/encode.c:198
> #6 0x00000000009e62d8 in do_encode (avctx=0x329ca00, frame=0x32e4400, got_packet=0x7fffffffdbf4) at libavcodec/encode.c:375
>
> #7 0x00000000009e6224 in avcodec_send_frame (avctx=0x329ca00, frame=0x32e4400) at libavcodec/encode.c:421
> #8 0x0000000000438ef5 in do_audio_out (of=0x3299560, ost=0x329c7a0, frame=0x32e4400) at ffmpeg.c:921
> #9 0x0000000000436c5b in reap_filters (flush=0) at ffmpeg.c:1515
> #10 0x000000000042dc30 in transcode_step () at ffmpeg.c:4553
> #11 0x000000000042bc49 in transcode () at ffmpeg.c:4597
> #12 0x000000000042b092 in main (argc=5, argv=0x7fffffffe678) at ffmpeg.c:4803
>
> (gdb) l
> 625
> 626 lo = b[i] >> 16;
> 627 hi = b[i] & 0xffff;
> 628 if(hi>=n)break;
> 629
> 630 tN = N[hi] - N[lo];
> 631 tX = X[hi] - X[lo];
> 632 tXX = XX[hi] - XX[lo];
> 633 tY = Y[hi] - Y[lo];
> 634 tXY = XY[hi] - XY[lo];
> (gdb) p hi
> $4 = 0
> (gdb) p lo
> $5 = 49656 // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> (gdb) p i
> $6 = 259
>
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
