Re: Re: CVE Request: jabberd remote information disclosure

[Hanno Böck <hanno () hboeck de>]

On Mon, 23 Feb 2015 16:16:38 -0500 (EST)
cve-assign () mitre org wrote:

> > If the data ends with an unterminated multi-byte UTF8
> > sequence then libidn may copy data past the buffer into the result.
>
> > https://github.com/jabberd2/jabberd2/issues/85
>
> > the stringprep functions from libidn require the input to be valid
> > UTF8
>
> > The libidn documentation claims "This function will not read or
> > write to characters outside that size." about the length of the
> > buffer that needs to be specified, but this is not true,
>
> Use CVE-2015-2059 for this libidn out-of-bounds read issue. Possibly
> it could be argued that this is a borderline case for a CVE. However,
> the documentation says "This function will not read or write to
> characters outside that size" rather than "If the input is valid
> UTF-8, then this function will not read or write to characters outside
> that size." If the input is not valid UTF-8, then the function is
> entitled to undefined behavior within the bounds of the buffer.

Old thread, but I thought worth mentioning. This was already found by
Sam Varshavchik in 2013:
http://permalink.gmane.org/gmane.comp.gnu.libidn.general/462

As the CVE is already assigned I don't think this matters too much, but
maybe MITRE wants to reference that.

-- 
Hanno Böck
http://hboeck.de/

mail/jabber: hanno () hboeck de
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