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Message-ID: <CAFkTriJZFFmHycp7jqP-S2j9BSV_nBW6SErPdFiM7s1dVu7hvQ@mail.gmail.com>
Date: Tue, 28 Jun 2016 15:13:29 +0800
From: Marco Grassi <marco.gra@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Apache Xerces getLastExtEntityInfo Use-After-Free
Hi Gustavo,
thank you for the feedback, yes applying that patch manually to trunk
resolves the UAF
is there a svn branch where this patch is already applied to retest?
Marco
On Tue, Jun 28, 2016 at 2:57 PM, Gustavo Grieco <gustavo.grieco@...il.com>
wrote:
> Hi,
>
> Is it related with CVE-2016-2099 still unfixed in 3.1.3
> (https://issues.apache.org/jira/browse/XERCESC-2066) ?
>
> Thanks!
>
> 2016-06-28 8:50 GMT+02:00 Marco Grassi <marco.gra@...il.com>:
> > Hi,
> >
> > the attached xml will trigger a UAF in xerces-c version 3.1.3 and the
> trunk
> > version
> >
> >
> > ➜ xml cat xerces_uaf | xerces-c-3.1.3/samples/StdInParse
> > =================================================================
> > ==16010==ERROR: AddressSanitizer: heap-use-after-free on address
> 0xf4a0dfcc
> > at pc 0x0836c7f4 bp 0xfff9a198 sp 0xfff9a188
> > READ of size 1 at 0xf4a0dfcc thread T0
> > #0 0x836c7f3 in
> >
> xercesc_3_1::ReaderMgr::getLastExtEntityInfo(xercesc_3_1::ReaderMgr::LastExtEntityInfo&)
> > const xercesc/internal/ReaderMgr.cpp:833
> > #1 0x83a42d4 in
> > xercesc_3_1::XMLScanner::emitError(xercesc_3_1::XMLErrs::Codes,
> > xercesc_3_1::XMLExcepts::Codes, unsigned short const*, unsigned short
> > const*, unsigned short const*, unsigned short const*)
> > xercesc/internal/XMLScanner.cpp:927
> > #2 0x8e40963 in
> > xercesc_3_1::IGXMLScanner::scanDocument(xercesc_3_1::InputSource const&)
> > xercesc/internal/IGXMLScanner.cpp:276
> > #3 0x84b4cca in
> xercesc_3_1::SAXParser::parse(xercesc_3_1::InputSource
> > const&) xercesc/parsers/SAXParser.cpp:575
> > #4 0x80533d6 in main src/StdInParse/StdInParse.cpp:186
> > #5 0xf6dd5636 in __libc_start_main (/lib32/libc.so.6+0x18636)
> > #6 0x80624f1
> >
> (/home/bob/VulnResearch/misc/xml/xerces-c-3.1.3/samples/StdInParse+0x80624f1)
> >
> > 0xf4a0dfcc is located 44 bytes inside of 56-byte region
> > [0xf4a0dfa0,0xf4a0dfd8)
> > freed by thread T0 here:
> > #0 0xf7228034 in operator delete(void*)
> > (/usr/lib32/libasan.so.3+0xc5034)
> > #1 0x80992df in xercesc_3_1::XMemory::operator delete(void*)
> > xercesc/util/XMemory.cpp:89
> >
> > previously allocated by thread T0 here:
> > #0 0xf72279b4 in operator new(unsigned int)
> > (/usr/lib32/libasan.so.3+0xc49b4)
> > #1 0x8357ad9 in xercesc_3_1::MemoryManagerImpl::allocate(unsigned
> int)
> > xercesc/internal/MemoryManagerImpl.cpp:40
> > #2 0x8099042 in xercesc_3_1::XMemory::operator new(unsigned int,
> > xercesc_3_1::MemoryManager*) xercesc/util/XMemory.cpp:68
> >
> > SUMMARY: AddressSanitizer: heap-use-after-free
> > xercesc/internal/ReaderMgr.cpp:833 in
> >
> xercesc_3_1::ReaderMgr::getLastExtEntityInfo(xercesc_3_1::ReaderMgr::LastExtEntityInfo&)
> > const
> > Shadow bytes around the buggy address:
> > 0x3e941ba0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> > 0x3e941bb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> > 0x3e941bc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> > 0x3e941bd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> > 0x3e941be0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> > =>0x3e941bf0: fa fa fa fa fd fd fd fd fd[fd]fd fa fa fa fa fa
> > 0x3e941c00: fd fd fd fd fd fd fd fa fa fa fa fa 00 00 00 00
> > 0x3e941c10: 00 00 00 fa fa fa fa fa 00 00 00 00 00 00 00 00
> > 0x3e941c20: fa fa fa fa 00 00 00 00 00 00 00 00 fa fa fa fa
> > 0x3e941c30: 00 00 00 00 00 00 00 00 fa fa fa fa 00 00 00 00
> > 0x3e941c40: 00 00 04 fa fa fa fa fa 00 00 00 00 00 00 04 fa
> > 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
> > Heap right redzone: fb
> > Freed heap region: fd
> > Stack left redzone: f1
> > Stack mid redzone: f2
> > Stack right redzone: f3
> > Stack partial redzone: f4
> > 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
> > ==16010==ABORTING
> >
> >
> >
> > Marco
> >
> > https://marcograss.github.io/
>
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