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Date: Wed, 01 Feb 2017 16:13:01 +0100
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: podofo: NULL pointer dereference in PoDoFo::PdfParser::ReadXRefSubsection (PdfParser.cpp)
Description:
podofo is a C++ library to work with the PDF file format.
A fuzz on it discovered a NULL pointer access. The upstream project denies me
to open a new ticket. So, I’m unable to communicate with them.
The complete ASan output:
# podofopdfinfo $FILE
==9418==ERROR: AddressSanitizer: SEGV on unknown address 0x0000000000d8 (pc
0x7f496cb0ab76 bp 0x7ffff028f9d0 sp 0x7ffff028f148 T0)
==9418==The signal is caused by a WRITE memory access.
==9418==Hint: address points to the zero page.
#0 0x7f496cb0ab75 /var/tmp/portage/sys-libs/glibc-2.22-
r4/work/glibc-2.22/string/../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:1989
#1 0x4c063e in __asan_memcpy /tmp/portage/sys-devel/llvm-3.9.0-
r1/work/llvm-3.9.0.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:413
#2 0x7f496dde143c in void std::_Construct(PoDoFo::PdfParser::TXRefEntry*,
PoDoFo::PdfParser::TXRefEntry const&) /usr/lib/gcc/x86_64-pc-linux-
gnu/4.9.3/include/g++-v4/bits/stl_construct.h:83:38
#3 0x7f496dde143c in void
std::__uninitialized_fill_n::__uninit_fill_n(PoDoFo::PdfParser::TXRefEntry*,
unsigned long, PoDoFo::PdfParser::TXRefEntry const&) /usr/lib/gcc/x86_64-pc-
linux-gnu/4.9.3/include/g++-v4/bits/stl_uninitialized.h:202
#4 0x7f496dde143c in void
std::uninitialized_fill_n(PoDoFo::PdfParser::TXRefEntry*, unsigned long,
PoDoFo::PdfParser::TXRefEntry const&) /usr/lib/gcc/x86_64-pc-linux-
gnu/4.9.3/include/g++-v4/bits/stl_uninitialized.h:244
#5 0x7f496dde143c in void
std::__uninitialized_fill_n_a(PoDoFo::PdfParser::TXRefEntry*, unsigned long,
PoDoFo::PdfParser::TXRefEntry const&, std::allocator&) /usr/lib/gcc/x86_64-pc-
linux-gnu/4.9.3/include/g++-v4/bits/stl_uninitialized.h:355
#6 0x7f496dde143c in std::vector<PoDoFo::PdfParser::TXRefEntry,
std::allocator
>::_M_fill_insert(__gnu_cxx::__normal_iterator<PoDoFo::PdfParser::TXRefEntry*,
std::vector<PoDoFo::PdfParser::TXRefEntry, std::allocator > >, unsigned long,
PoDoFo::PdfParser::TXRefEntry const&) /usr/lib/gcc/x86_64-pc-linux-
gnu/4.9.3/include/g++-v4/bits/vector.tcc:496
#7 0x7f496ddd4a67 in std::vector<PoDoFo::PdfParser::TXRefEntry,
std::allocator
>::insert(__gnu_cxx::__normal_iterator<PoDoFo::PdfParser::TXRefEntry*,
std::vector<PoDoFo::PdfParser::TXRefEntry, std::allocator > >, unsigned long,
PoDoFo::PdfParser::TXRefEntry const&) /usr/lib/gcc/x86_64-pc-linux-
gnu/4.9.3/include/g++-v4/bits/stl_vector.h:1073:9
#8 0x7f496ddd4a67 in std::vector<PoDoFo::PdfParser::TXRefEntry,
std::allocator >::resize(unsigned long, PoDoFo::PdfParser::TXRefEntry)
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/g++-v4/bits/stl_vector.h:716
#9 0x7f496ddd4a67 in PoDoFo::PdfParser::ReadXRefSubsection(long&, long&)
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfParser.cpp:772
#10 0x7f496ddc60bd in PoDoFo::PdfParser::ReadXRefContents(long, bool)
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfParser.cpp:725:17
#11 0x7f496ddbfaae in PoDoFo::PdfParser::ReadDocumentStructure()
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfParser.cpp:337:9
#12 0x7f496ddbce1f in
PoDoFo::PdfParser::ParseFile(PoDoFo::PdfRefCountedInputDevice const&, bool)
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfParser.cpp:220:9
#13 0x7f496ddbb1e4 in PoDoFo::PdfParser::ParseFile(char const*, bool)
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/base/PdfParser.cpp:164:11
#14 0x7f496e018393 in PoDoFo::PdfMemDocument::Load(char const*)
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/doc/PdfMemDocument.cpp:186:16
#15 0x7f496e018062 in PoDoFo::PdfMemDocument::PdfMemDocument(char const*)
/tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/src/doc/PdfMemDocument.cpp:88:11
#16 0x511b44 in PdfInfo::PdfInfo(std::string const&) /tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/tools/podofopdfinfo/pdfinfo.cpp:25:16
#17 0x521ac8 in main /tmp/portage/app-
text/podofo-0.9.4/work/podofo-0.9.4/tools/podofopdfinfo/podofopdfinfo.cpp:110:15
#18 0x7f496c9f461f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
#19 0x41e8f8 in _start (/usr/bin/podofopdfinfo+0x41e8f8)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /var/tmp/portage/sys-libs/glibc-2.22-
r4/work/glibc-2.22/string/../sysdeps/x86_64/multiarch/memcpy-ssse3-back.S:1989
==9418==ABORTING
Affected version:
0.9.4
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00134-podofo-nullptr-pdfparser-cpp
Timeline:
2017-01-05: bug discovered
2017-02-01: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/02/01/podofo-null-pointer-dereference-in-podofopdfparserreadxrefsubsection-pdfparser-cpp
--
Agostino Sarubbo
Gentoo Linux Developer
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