oss-security - Re: CVE Request -- cURL / mingw32-cURL -- Did not strip directory parts separated by backslashes, when downloading files

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Message-ID: <4CB5FA0B.7070401@redhat.com>
Date: Wed, 13 Oct 2010 20:27:23 +0200
From: Jan Lieskovsky <jlieskov@...hat.com>
To: "Steven M. Christey" <coley@...us.mitre.org>
CC: oss-security@...ts.openwall.com, Daniel Stenberg <daniel@...x.se>,
        Erik van Pienbroek <erik-fedora@...pienbroek.nl>
Subject: Re: CVE Request -- cURL / mingw32-cURL -- Did not
 strip directory parts separated by backslashes, when downloading files

Hi Steve,

   just small correction. As stated in:
   [1] https://bugzilla.redhat.com/show_bug.cgi?id=642642#c4

the mingw32-curl package is not affected by this issue, as the
error is only present in curl command line tool and that tool
is not bundled in the final compiled form of mingw32-curl rpm.

So the CVE request applies really only to native systems, using
backslash as directory entries delimiter / separator.

Thanks && Regards, Jan.
--
Jan iankko Lieskovsky / Red Hat Security Response Team

Jan Lieskovsky wrote:
> Hello Steve, vendors,
> 
>   cURL upstream has released new curl / libcurl v7.21.2 addressing one 
> security flaw,
> specific for operating systems, where backslashes are used to separate 
> directories from
> file names. More details follow:
> 
> cURL did not properly cut off directory parts from user provided
> file name to be downloaded on operating systems, where backslashes
> are used to separate directories and file names. This could allow
> remote servers to create or overwrite files via a Content-Disposition
> header that suggests a crafted filename, and possibly execute arbitrary
> code as a consequence of writing to a certain file in a user's home
> directory. Different vulnerability than CVE-2010-2251, CVE-2010-2252
> and CVE-2010-2253.
> 
> Note: As already mentioned in [2]. This flaw only affected those
>       operating systems, where backslash is used to separate directories
>       and file names, thus Microsoft Windows, Novell Netware, MSDOS, OS/2
>       and Symbian to mention some of them.
> 
> References:
> [1] http://curl.haxx.se/docs/security.html
> [2] http://curl.haxx.se/docs/adv_20101013.html
> 
> Upstream patch:
> [3] http://curl.haxx.se/curl-content-disposition.patch
> 
> Credit: Upstream acknowledges Dan Fandrich as the original reporter.
> 
> Red Hat Bugzilla tracking system record:
> [4] https://bugzilla.redhat.com/show_bug.cgi?id=642642
> 
> Could you please allocate a CVE id for this issue?
> 
> Thanks && Regards, Jan.
> -- 
> Jan iankko Lieskovsky / Red Hat Security Response Team

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