Date: Sun, 19 Apr 2015 10:15:41 -0700 From: Michal Zalewski <lcamtuf@...edump.cx> To: oss-security <oss-security@...ts.openwall.com> Subject: Re: libxml2 issue: out-of-bounds memory access when parsing an unclosed HTML comment Uh, so I guess we could also mention this one: https://bugzilla.gnome.org/show_bug.cgi?id=744980 I wasn't sure it would ever cause anything serious / interesting, though. Perhaps for some exotic uses? /mz On Sun, Apr 19, 2015 at 10:11 AM, Reed Loden <reed@...dloden.com> wrote: > (saw this randomly today on Twitter, so figured I'd send it on to make sure > it gets a CVE and actually gets fixed) > > https://hackerone.com/reports/57125#activity-384861 > > """ > This is an out-of-bounds memory access in libxml2. By entering a unclosed > html comment such as <!-- the libxml2 parser didn't stop parsing at the end > of the buffer, causing random memory to be included in the parsed comment > that was returned to ruby. In Shopify, this caused ruby objects from > previous http requests to be disclosed in the rendered page. > > Link to the issue in libxml2's bugtracker: > https://bugzilla.gnome.org/show_bug.cgi?id=746048 > > A patched version of nokogiri (which uses a embedded libxml2) is available > here: > https://github.com/Shopify/nokogiri/compare/1b1fcad8bd64ab70256666c38d2c998e86ade8c0...master > > This bug is still not patched upstream, but both libxml2 and nokogiri > developers are aware of the issue. > """ > > ~reed
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