full-disclosure - [FD] vorbis-tools oggenc vulnerability

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Message-ID: <2cb4328d.e49.15d92ed4a9c.Coremail.qflb.wu@dbappsecurity.com.cn>
Date: Sun, 30 Jul 2017 17:56:50 +0800 (GMT+08:00)
From: "qflb.wu" <qflb.wu@...ppsecurity.com.cn>
To: fulldisclosure@...lists.org
Subject: [FD] vorbis-tools oggenc vulnerability

vorbis-tools oggenc vulnerability
================
Author : qflb.wu
===============

Introduction:
=============
The Vorbis Tools package contains command-line tools useful for encoding, playing or editing files using the Ogg CODEC.

Affected version:
=====
1.4.0

Vulnerability Description:
==========================
the wav_open function in oggenc/audio.c in vorbis-tools 1.4.0 can cause a denial of service(memory allocation error) via a crafted wav file.

./oggenc vorbis-tools_1.4.0_oggenc_memory_allocation_error.wav -o out

==68126==WARNING: AddressSanitizer failed to allocate 0xffffffffffffbc00 bytes
==68126==AddressSanitizer's allocator is terminating the process instead of returning 0
==68126==If you don't like this behavior set allocator_may_return_null=1
==68126==AddressSanitizer CHECK failed: /build/buildd/llvm-toolchain-3.4-3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cc:149 "((0)) != (0)" (0x0, 0x0)
    #0 0x46d41f in __asan::AsanCheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/home/a/Downloads/vorbis-tools-1.4.0/oggenc/oggenc+0x46d41f)
    #1 0x472c81 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/home/a/Downloads/vorbis-tools-1.4.0/oggenc/oggenc+0x472c81)
    #2 0x4719c0 in __sanitizer::AllocatorReturnNull() (/home/a/Downloads/vorbis-tools-1.4.0/oggenc/oggenc+0x4719c0)
    #3 0x4674b6 in __interceptor_malloc (/home/a/Downloads/vorbis-tools-1.4.0/oggenc/oggenc+0x4674b6)
    #4 0x492896 in wav_open /home/a/Downloads/vorbis-tools-1.4.0/oggenc/audio.c:573
    #5 0x496d8e in open_audio_file /home/a/Downloads/vorbis-tools-1.4.0/oggenc/audio.c:86
    #6 0x485d0a in main /home/a/Downloads/vorbis-tools-1.4.0/oggenc/oggenc.c:256
    #7 0x7f6d9f8dcec4 (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)
    #8 0x47d55c in _start (/home/a/Downloads/vorbis-tools-1.4.0/oggenc/oggenc+0x47d55c)

    -----------------
wav->channel_permute = malloc(wav->channels * sizeof(int));
if (wav->channels <= 8)
   /* Where we know the mappings, use them. */
   memcpy(wav->channel_permute, wav_permute_matrix[wav->channels-1], 
           sizeof(int) * wav->channels);
else
   /* Use a default 1-1 mapping */
   for (i=0; i < wav->channels; i++)
       wav->channel_permute[i] = i;

return 1;

Andthe code didn't check the return of malloc.

POC:
vorbis-tools_1.4.0_oggenc_memory_allocation_error.wav
CVE:
CVE-2017-11331

===============================

qflb.wu () dbappsecurity com cn

Download attachment "poc.zip" of type "application/x-zip-compressed" (1752 bytes)

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