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Last updated: 4/30/2016 3:03:58 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2010-3493

Original release date: 10/19/2010
Last revised: 05/14/2013


Multiple race conditions in smtpd.py in the smtpd module in Python 2.6, 2.7, 3.1, and 3.2 alpha allow remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected return value of None, an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, or the getpeername function having an ENOTCONN error, a related issue to CVE-2010-3492.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.3 MEDIUM
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

References to Advisories, Solutions, and Tools

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External Source: MISC
Name: https://bugs.launchpad.net/zodb/+bug/135108
External Source: MLIST
Name: [oss-security] 20100909 CVE Request -- Python -- accept() implementation in async core is broken => more subcases
External Source: MLIST
Name: [oss-security] 20100922 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases
External Source: SUSE
Name: SUSE-SR:2011:002
External Source: MISC
Name: http://bugs.python.org/issue6706
Type: Advisory; Patch Information
External Source: UBUNTU
Name: USN-1613-1
External Source: CONFIRM
Name: http://bugs.python.org/issue9129
Type: Advisory; Patch Information
External Source: BID
Name: 44533
External Source: MLIST
Name: [oss-security] 20100924 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases
External Source: VUPEN
Name: ADV-2011-0212
External Source: MLIST
Name: [oss-security] 20100910 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=632200
External Source: SUSE
Name: SUSE-SR:2010:024
External Source: MANDRIVA
Name: MDVSA-2010:216
External Source: UBUNTU
Name: USN-1613-2
External Source: OVAL
Name: oval:org.mitre.oval:def:12210
External Source: CONFIRM
Name: http://svn.python.org/view/python/branches/py3k/Lib/smtpd.py?r1=84289&r2=84288&pathrev=84289
Type: Patch Information
External Source: UBUNTU
Name: USN-1596-1
External Source: CONFIRM
Name: http://svn.python.org/view?view=rev&revision=84289
External Source: MANDRIVA
Name: MDVSA-2010:215

References to Check Content

Identifier: oval:org.mitre.oval:def:12210
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Technical Details

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