oss-security - Re: CVE Request -- python (SimpleXMLRPCServer): DoS (excessive CPU usage) via malformed XML-RPC / HTTP POST request

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Date: Tue, 14 Feb 2012 12:13:01 +0100
From: Jan Lieskovsky <jlieskov@...hat.com>
CC: Kurt Seifried <kseifried@...hat.com>, oss-security@...ts.openwall.com,
        "Steven M. Christey" <coley@...us.mitre.org>,
        Daniel Callaghan <dcallagh@...hat.com>,
        David Malcolm <dmalcolm@...hat.com>
Subject: Re: CVE Request -- python (SimpleXMLRPCServer): DoS
 (excessive CPU usage) via malformed XML-RPC / HTTP POST request


Hello vendors,

   just FYI, this issue affected also upstream
PyPy v1.6 and v1.8 versions. Relevant upstream bug
being here:
https://bugs.pypy.org/issue1047

Thanks to David Malcolm for pointing this out!

On 02/13/2012 04:57 PM, Kurt Seifried wrote:
> On 02/13/2012 07:03 AM, Jan Lieskovsky wrote:
>> Hello Kurt, Steve, vendors,
>>
>>    we have been notified by Daniel Callaghan via:
>> [1] https://bugzilla.redhat.com/show_bug.cgi?id=789790
>>
>> about a denial of service flaw present in the way
>> Simple XML-RPC Server module of Python processed
>> client connections, that were closed prior the
>> complete request body has been received. A remote
>> attacker could use this flaw to cause Python Simple
>> XML-RPC based server process to consume excessive
>> amount of CPU.
>>
>> Issue has been reported upstream at:
>> [2] http://bugs.python.org/issue14001
>>
>> Could you allocate a CVE identifier for this?
>>
>> Thank you&&  Regards, Jan.
>> --
>> Jan iankko Lieskovsky / Red Hat Security Response Team
>
> Please use CVE-2012-0845 for this issue.

Thanks, Kurt.

Since the issue in PyPy is also coming from upstream Python
SimpleXMLRPCServer.py module implementation:

../pypy-1.6/lib-python/2.7/SimpleXMLRPCServer.py

assuming one CVE identifier is enough for both issues.

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

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