oss-security - Re: CVE for Ruby Entity expansion DoS vulnerability in REXML (XML bomb)

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Message-Id: <20130311074618.B20FA6EA62@zanzibar.garbagecollect.jp>
Date: Mon, 11 Mar 2013 16:46:19 +0900
From: "U.Nakamura" <usa@...bagecollect.jp>
To: security@...y-lang.org
Cc: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>,
 Mitre CVE assign department <cve-assign@...re.org>,
 Steven Christey <coley@...re.org>
Subject: Re: CVE for Ruby Entity expansion DoS vulnerability in REXML (XML bomb)

Hello,

Thank you for your information.
I've just added the CVE identifier to our site now.

Sorry for late reply.


In message "CVE for Ruby Entity expansion DoS vulnerability in REXML (XML bomb)"
    on Mar.07,2013 03:25:13, <kseifried@...hat.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> http://www.ruby-lang.org/en/news/2013/02/22/rexml-dos-2013-02-22/
> 
> =====
> 
> Unrestricted entity expansion can lead to a DoS vulnerability in
> REXML. (The CVE identifier will be assigned later.) We strongly
> recommend to upgrade ruby.
> Details
> 
> When reading text nodes from an XML document, the REXML parser can be
> coerced in to allocating extremely large string objects which can
> consume all of the memory on a machine, causing a denial of service.
> 
> Impacted code will look something like this:
> 
> document = REXML::Document.new some_xml_doc
> document.root.text
> 
> When the `text` method is called, entities will be expanded. An
> attacker can send a relatively small XML document that, when the
> entities are resolved, will consume extreme amounts of memory on the
> target system.
> 
> Note that this attack is similar to, but different from the Billion
> Laughs attack. This is also related to CVE-2013-1664 of Python.
> 
> All users running an affected release should either upgrade or use one
> of the work arounds immediately.
> 
> =====
> 
> Please use CVE-2013-1821 for this issue. I apologize in advance if a
> CVE was requested through other channels but we need a CVE for this
> ASAP. Also for future reference you can get CVEs via
> 
> http://people.redhat.com/kseifrie/CVE-OpenSource-Request-HOWTO.html
> 
> - -- 
> Kurt Seifried Red Hat Security Response Team (SRT)
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Regards,
-- 
U.Nakamura <usa@...bagecollect.jp>

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