Re: CVE request: remote code execution in egroupware <= 1.8.005

[Ralf Becker <rb () stylite de>]

Hi,

my remarks to your questions as developer of EGroupware and the fixes
included in 1.8.006:

Am 19.02.14 16:41, schrieb cve-assign () mitre org:
> > I have discovered a remote code execution via php unserialize in egroupware
> > <= 1.8.005.
>
> Use CVE-2014-2027.
>
> > https://github.com/pedrib/PoC/raw/master/egroupware-1.8.005.txt
> > http://www.egroupware.org/changelog
>
> > Security: fixed arbitrary file overwrite and remote code execution
> > reported by Pedro Ribeiro (pedrib () gmail com) of Agile Information
> > Security
>
> We could not immediately determine whether the egroupware-1.8.005.txt
> disclosure means that:
>
>   Arbitrary file overwrite in __destruct:
>
>   Remote code execution in __destruct:
>
> are both exploitable only as a consequence of unsafe unserialize use.

Removing PHP unserialization removes the thread, as all these values got
not stored. So passing PHP serialized data to 1.8.006 code only gives an
error, as json_unserialize does not understand it.

> If eliminating the unsafe unserialize use would not completely address
> those issues, additional CVE IDs may be needed.
>
> There are no new CVE assignments yet for possible other issues in the
> 1.8.006.20140217 changelog entry, such as:
>
>   CalDAV/Calendar: fixed permanent auth request in iCal, if
>   accountselection is set to "selectbox with groupmembers" and rights
>   granted from group without being a member

This is NOT security relevant, server-side errors / exceptions cause
basic auth requests as a means to show to user something went wrong.

>   SiteMgr: fixed not working anonymous user and using now a random
>   password

This is a hardening included in 1.8.005 by no longer using a static
password for anonymous user, but setting up a random one during
installation time.

So I dont think further CVE's are needed.

Ralf
-- 
Ralf Becker
Director Software Development

Stylite AG

Morschheimer Strasse 15 | Tel. +49 6352 70629 0
D-67292 Kirchheimbolanden | Fax. +49 6352 70629 30

Email: rb () stylite de

www.stylite.de | www.egroupware.org

Managing Directors: Andre Keller | Ralf Becker | Gudrun Mueller
Chairman of the supervisory board: Prof. Dr. Birger Leon Kropshofer

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