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Message-ID: <CACn5sdQFwV6SfDa=pgey+CMFp2N0RBSh69UFMtXOr9j+aZsE+A@mail.gmail.com>
Date: Tue, 28 Jun 2016 08:57:03 +0200
From: Gustavo Grieco <gustavo.grieco@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Apache Xerces getLastExtEntityInfo Use-After-Free
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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