Re: Re: CVE request: Null pointer derefence parsing xml file using libxml 2.9.4 (in recover mode)

[Gustavo Grieco <gustavo.grieco () gmail com>]

2017-02-08 19:32 GMT-03:00 Ian Zimmerman <itz () primate net>:

> On 2016-11-05 10:04, Gustavo Grieco wrote:
>
> > We found a null pointer dereference when parsing a xml file using recover
> > mode. It was tested in libxml 2.9.4 (ArchLinux x86_64). To reproduce:
> >
> > $ xmllint --recover crash-libxml2-recover.xml
> >
> > ==27646==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000
> > (pc 0x0000004fbd88 bp 0x7ffc3345dff0 sp 0x7ffc3345dfd0 T0)
> >     #0 0x4fbd87 in xmlDumpElementContent
> > /home/g/Work/Code/libxml2-2.9.4/valid.c:1181
> >     #1 0x4fbcd5 in xmlDumpElementContent
> > /home/g/Work/Code/libxml2-2.9.4/valid.c:1177
> >     #2 0x4fe5ff in xmlDumpElementDecl
> > /home/g/Work/Code/libxml2-2.9.4/valid.c:1706
> >     #3 0x72e714 in xmlBufDumpElementDecl
> > /home/g/Work/Code/libxml2-2.9.4/xmlsave.c:501
> >     #4 0x73048f in xmlNodeDumpOutputInternal
> > /home/g/Work/Code/libxml2-2.9.4/xmlsave.c:939
> >     #5 0x72fc47 in xmlNodeListDumpOutput
> > /home/g/Work/Code/libxml2-2.9.4/xmlsave.c:825
> >     #6 0x72f6d5 in xmlDtdDumpOutput
> > /home/g/Work/Code/libxml2-2.9.4/xmlsave.c:749
> >     #7 0x73038f in xmlNodeDumpOutputInternal
> > /home/g/Work/Code/libxml2-2.9.4/xmlsave.c:931
> >     #8 0x732412 in xmlDocContentDumpOutput
> > /home/g/Work/Code/libxml2-2.9.4/xmlsave.c:1234
> >     #9 0x735883 in xmlSaveDoc /home/g/Work/Code/libxml2-2.9.
> 4/xmlsave.c:1936
> >     #10 0x40ba0f in parseAndPrintFile
> > /home/g/Work/Code/libxml2-2.9.4/xmllint.c:2712
> >     #11 0x411eb6 in main /home/g/Work/Code/libxml2-2.9.4/xmllint.c:3767
> >     #12 0x7f23dcd4c290 in __libc_start_main (/usr/lib/libc.so.6+0x20290)
> >     #13 0x4032b9 in _start
> > (/home/g/Work/Code/libxml2-2.9.4/xmllint+0x4032b9)
>
> Where did this one ever go?  Is there a CVE?  Is there a patch?

AFAIK: no patch, no CVE.


> --
> Please *no* private Cc: on mailing lists and newsgroups
> Personal signed mail: please _encrypt_ and sign
> Don't clear-text sign: http://cr.yp.to/smtp/8bitmime.html