Date: Mon, 16 Nov 2020 12:43:18 +0100 From: Salvatore Bonaccorso <carnil@...ian.org> To: oss-security@...ts.openwall.com Subject: Re: Buffer Overflow in raptor widely unfixed in Linux distros Hi, On Fri, Nov 13, 2020 at 01:33:31PM +0100, Hanno Böck wrote: [...] > FWIW I recently tried to fuzz raptor again with the fix applied. I > quickly found another OOB issue > https://bugs.librdf.org/mantis/view.php?id=650 > > From the bug report: > > A malformed input file can lead to a segfault due to an out of bounds > array access in raptor_xml_writer_start_element_common. > > Bug happens in line 230 of raptor_xml_writer.c (current git): > https://github.com/dajobe/raptor/blob/master/src/raptor_xml_writer.c#L230 > > From looking at that code it seems to me it always expects > nspace_declarations_count to be lower than element->attribute_count, > however this input seems to create a different situation. I made an > attempt at a patch that throws an error in this situation (but please > review it, I am not familiar with what this code does and should do - > though the patch doesn't seem to introduce test failures). > > (proposed patch, example file and stacktrace can be found attached to > the bugreport) CVE-2020-25713 was assigned for this issue. Regards, Salvatore
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