Bug 632200 (CVE-2010-3493)

Summary:	CVE-2010-3493 Python: SMTP proxy RFC 2821 module DoS (uncaught exception) (Issue #9129)
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bressers, dmalcolm, ivazqueznet, james.antill, jonathansteffan, jrusnack, katzj, psplicha, vdanen
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-19 13:44:30 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	693954, 693955, 693956, 693961
Bug Blocks:

Description Jan Lieskovsky 2010-09-09 12:01:09 UTC

A race condition was found in the way Python's SMTP proxy
module (smtpd.py) processed retrieving of remote IP 
address the socket was connected to (the other end 
could close the connection sooner before the requester 
could get the peername). A remote, unauthenticated user 
could use this flaw to cause the running python SMTP 
instance to terminate with uncaught exception by 
issuing sequence of connection requests within short 
time interval.

References:
[1] http://bugs.python.org/issue9129

Upstream patch:
[2] http://svn.python.org/view?view=rev&revision=84289

Comment 1 Jan Lieskovsky 2010-09-09 12:03:41 UTC

Public issue proof of concept (from [1]):
=========================================
1, In one shell run: "python -m smtpd -n"
2, In another one run: "for i in {1..1000};do nmap -sT -p 8025 localhost;done"

Comment 2 Jan Lieskovsky 2010-09-09 12:04:55 UTC

This issue affects the versions of the python package, as shipped
with Red Hat Enterprise Linux 3, 4, and 5.

--

This issue affects the versions of the python package, as shipped
with Fedora release of 12 and 13.

Comment 7 Jan Lieskovsky 2010-09-09 13:05:43 UTC

CVE Request:
[1] http://www.openwall.com/lists/oss-security/2010/09/09/6

Comment 8 Josh Bressers 2010-12-15 19:02:36 UTC

Upstream has fixed this in just the SMTP module:
http://svn.python.org/view?rev=87123&view=rev

It seems there isn't a nice way to fix this everywhere.

Comment 12 errata-xmlrpc 2011-05-05 18:20:48 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:0492 https://rhn.redhat.com/errata/RHSA-2011-0492.html

Comment 13 errata-xmlrpc 2011-05-05 18:56:45 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 4

Via RHSA-2011:0491 https://rhn.redhat.com/errata/RHSA-2011-0491.html

Comment 14 Vincent Danen 2011-05-05 19:58:06 UTC

Statement:

(none)

Comment 15 errata-xmlrpc 2011-05-19 11:35:38 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0554 https://rhn.redhat.com/errata/RHSA-2011-0554.html