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Message-ID: <683711.049237417-sendEmail@localhost>
Date: Fri, 22 Sep 2017 07:55:13 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: bento4: stack-based buffer underflow in AP4_VisualSampleEntry::ReadFields (Ap4SampleEntry.cpp)
Description:
bento4 is a fast, modern, open source C++ toolkit for all your MP4 and MPEG DASH media format needs.
The complete ASan output of the issue:
# mp42aac $FILE out.aac
==4435==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x7fe62b800e86 at pc 0x00000057b5a3 bp 0x7ffea98c1b10 sp 0x7ffea98c1b08
WRITE of size 1 at 0x7fe62b800e86 thread T0
#0 0x57b5a2 in AP4_VisualSampleEntry::ReadFields(AP4_ByteStream&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4SampleEntry.cpp:780:40
#1 0x575726 in AP4_SampleEntry::Read(AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4SampleEntry.cpp:108:5
#2 0x57d624 in AP4_VisualSampleEntry::AP4_VisualSampleEntry(unsigned int, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4SampleEntry.cpp:742:5
#3 0x57d624 in AP4_AvcSampleEntry::AP4_AvcSampleEntry(unsigned int, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4SampleEntry.cpp:994
#4 0x5cbf58 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:305:24
#5 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#6 0x586a2c in AP4_StsdAtom::AP4_StsdAtom(unsigned int, unsigned char, unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4StsdAtom.cpp:100:13
#7 0x58566f in AP4_StsdAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4StsdAtom.cpp:56:16
#8 0x5ca71c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:422:20
#9 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#10 0x60c29f in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:193:12
#11 0x60b1d2 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:138:5
#12 0x60b1d2 in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:87
#13 0x5ca44c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:751:20
#14 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#15 0x60c561 in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:193:12
#16 0x60b1d2 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:138:5
#17 0x60b1d2 in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:87
#18 0x5ca44c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:751:20
#19 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#20 0x60c561 in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:193:12
#21 0x60b1d2 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:138:5
#22 0x60b1d2 in AP4_ContainerAtom::Create(unsigned int, unsigned long long, bool, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:87
#23 0x5ca44c in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:751:20
#24 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#25 0x60c561 in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:193:12
#26 0x60c099 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:138:5
#27 0x58e6ed in AP4_TrakAtom::AP4_TrakAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4TrakAtom.cpp:165:5
#28 0x5c8e3b in AP4_TrakAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4TrakAtom.h:58:20
#29 0x5c8e3b in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:377
#30 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#31 0x60c561 in AP4_ContainerAtom::ReadChildren(AP4_AtomFactory&, AP4_ByteStream&, unsigned long long) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:193:12
#32 0x60c099 in AP4_ContainerAtom::AP4_ContainerAtom(unsigned int, unsigned long long, bool, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4ContainerAtom.cpp:138:5
#33 0x5521b0 in AP4_MoovAtom::AP4_MoovAtom(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4MoovAtom.cpp:79:5
#34 0x5cad1d in AP4_MoovAtom::Create(unsigned int, AP4_ByteStream&, AP4_AtomFactory&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4MoovAtom.h:56:20
#35 0x5cad1d in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned int, unsigned int, unsigned long long, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:357
#36 0x5c7fbd in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, unsigned long long&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:220:14
#37 0x5c75c0 in AP4_AtomFactory::CreateAtomFromStream(AP4_ByteStream&, AP4_Atom*&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4AtomFactory.cpp:150:12
#38 0x54ea2c in AP4_File::ParseStream(AP4_ByteStream&, AP4_AtomFactory&, bool) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4File.cpp:104:12
#39 0x54f0fa in AP4_File::AP4_File(AP4_ByteStream&, bool) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4File.cpp:78:5
#40 0x542552 in main /tmp/Bento4-1.5.0-617/Source/C++/Apps/Mp42Aac/Mp42Aac.cpp:242:32
#41 0x7fe62e887680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#42 0x44f3f8 in _start (/usr/bin/mp42aac+0x44f3f8)
Address 0x7fe62b800e86 is located in stack of thread T0 at offset 6 in frame
#0 0x57b2ef in AP4_VisualSampleEntry::ReadFields(AP4_ByteStream&) /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4SampleEntry.cpp:759
This frame has 1 object(s):
[32, 65) 'compressor_name'
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
(longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-underflow /tmp/Bento4-1.5.0-617/Source/C++/Core/Ap4SampleEntry.cpp:780:40 in AP4_VisualSampleEntry::ReadFields(AP4_ByteStream&)
Shadow bytes around the buggy address:
0x0ffd456f8180: f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00
0x0ffd456f8190: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
0x0ffd456f81a0: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
0x0ffd456f81b0: f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00
0x0ffd456f81c0: f1 f1 f1 f1 04 f2 00 f2 f2 f2 00 f3 f3 f3 f3 f3
=>0x0ffd456f81d0:[f1]f1 f1 f1 00 00 00 00 01 f3 f3 f3 f3 f3 f3 f3
0x0ffd456f81e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd456f81f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd456f8200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd456f8210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ffd456f8220: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==4435==ABORTING
Affected version:
1.5.0-617
Fixed version:
N/A
Commit fix:
https://github.com/axiomatic-systems/Bento4/commit/03d1222ab9c2ce779cdf01bdb96cdd69cbdcfeda
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-14639
Reproducer:
https://github.com/asarubbo/poc/blob/master/00344-bento4-stackunderflow-AP4_VisualSampleEntry_ReadFields
Timeline:
2017-09-08: bug discovered and reported to upstream
2017-09-14: blog post about the issue
2017-09-21: 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/2017/09/14/bento4-stack-based-buffer-underflow-in-ap4_visualsampleentryreadfields-ap4sampleentry-cpp/
--
Agostino Sarubbo
Gentoo Linux Developer
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