oss-security - CVE Request -- python-paste-script: Supplementary groups not dropped when started an application with "paster serve" as root

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Date: Thu, 23 Feb 2012 18:05:06 +0100
From: Jan Lieskovsky <jlieskov@...hat.com>
To: "Steven M. Christey" <coley@...us.mitre.org>
CC: oss-security@...ts.openwall.com, Clay Gerrard <clay.gerrard@...il.com>,
        Ian Bicking <ianbicking@...il.com>, Jan Pokorny <jpokorny@...hat.com>,
        David Malcolm <dmalcolm@...hat.com>, Luke Macken <lmacken@...hat.com>
Subject: CVE Request -- python-paste-script: Supplementary groups not dropped
 when started an application with "paster serve" as root

Hello Kurt, Steve, vendors,

   a security flaw was found in the way Paster, a pluggable command-line frontend,
when started as root (for example to have access to privileged port) to serve a
web based application, performed privileges dropping upon startup
(supplementary groups were not dropped properly regardless of the UID, GID
specified in the .ini configuration file or in the --user and --group CL
arguments). A remote attacker could use this flaw for example to read / write
root GID accessible files, if the particular web application provided remote
means for local file manipulation.

Credit / Issue Reported by: Clay Gerrard

References:
[1] http://groups.google.com/group/paste-users/browse_thread/thread/2aa651ba331c2471
[2] https://bugzilla.redhat.com/show_bug.cgi?id=796790

Patch proposed by the issue reporter:
[3] https://bitbucket.org/ianb/pastescript/pull-request/3/fix-group-permissions-for-pastescriptserve

Upstream patch:
[4] https://bitbucket.org/ianb/pastescript/changeset/a19e462769b4

Could you allocate a CVE id for this?

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

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