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Date: Sun, 4 Jan 2015 10:56:32 +0800
From: 罗大龙 <luodalongde@...il.com>
To: oss-security@...ts.openwall.com
Subject: 【Vulnerability Report 】 - from QIHU 360 China
HI there,
Greeting! This is Qinghao Tang from QIHU 360 company, China. I am a
security researcher there.
I'm writing to apply for a CVE ID, for a 0day vulnerability in ffmpeg.
Please refer to below report.
[requester info]
name: Qinghao Tang
company: QIHU 360 company, China
email:luodalongde@...il.com
[vendor info]
name: ffmpeg
email: ffmpeg-security@...peg.org
website: http://www.ffmpeg.org/
[vulnerable ffmpeg version]
2.1.x
[vulnerability Description]
The seg_write_packet () function in ffmpeg-2.1.4/libavformat/segment.c
exists a UAF (use after free) vulnerability , which allows remote attachers
to cause a denial of service(invalid memory handler) or possibly execute
arbitrary code by use a crafted video file.
[vulnerability resaon]
static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
....
//segment_start() -> segment_mux_init()：s->priv_data->avf =
avformat_alloc_context()
//i.e. reset：s->priv_data->avf
if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
goto fail;
....
fail:
if (pkt->stream_index == seg->reference_stream_index)
seg->frame_count++;
if (ret < 0) {
if (seg->list)
avio_close(seg->list_pb);
//oc has been freed before.
avformat_free_context(oc);
}
return ret;
}
[crash info from /var/log/messages]
Dec 24 15:41:26 w-r351 kernel: ffmpeg[8927]: segfault at 7fffffff0 ip
000000000057599e sp 00007fff0beacfc0 error 4 in ffmpeg[400000+a7b000]
Dec 23 02:45:58 localhost kernel: ffmpeg[11883]: segfault at 8000 ip
0000000000ba45c2 sp 00007fff740292d0 error 4 in ffmpeg[400000+a7b000]
Dec 17 01:18:31 w-r359 kernel: ffmpeg[17119]: segfault at 100000028ip
00000000005758de sp 00007fff4b1847a0 error 4 in ffmpeg[400000+a7b000]
Dec 17 09:13:59 w-r351 kernel: ffmpeg[4451]: segfault at 1c8 ip
0000000000575949 sp 00007fff23065010 error 4 in ffmpeg[400000+a7b000]
[patch]
ffmpeg-2.1.6/libavformat/segment.c
--- segment.c 2014-11-29 03:34:20.000000000 +0800
+++ segment.c.new 2014-12-25 10:21:24.257001354 +0800
@@ -713,7 +713,7 @@
if (ret < 0) {
if (seg->list)
avio_close(seg->list_pb);
- avformat_free_context(oc);
+ avformat_free_context(seg->avf);
}
return ret;
[vulnerability sample]
The sample is a porn video.
Download url:http://www.datafilehost.com/d/b384ec71
Thanks
Merry Christmas and a happy new year!
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