Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | python +5 | 2.6.6-20.el6 | RHSA-2011:0554 |
| RHEL 6 | python-docs | 2.6.6-2.el6 | RHSA-2011:0554 |
| RHEL 5 | python +4 | 2.4.3-44.el5 | RHSA-2011:0492 |
| RHEL 4 | python +4 | 2.3.4-14.10.el4 | RHSA-2011:0491 |
Advisories 3
- RHSA-2011:0554 Red Hat Security Advisory: python security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2011:0492 Red Hat Security Advisory: python security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2011:0491 Red Hat Security Advisory: python security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
References
- http://svn.python.org/view/python/branches/py3k/Lib/smtpd.py?r1=84289&r2=84288&pathrev=84289
- [oss-security] 20100910 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=632200
- 43068 third-party-advisory
- https://bugs.launchpad.net/zodb/+bug/135108
- ADV-2011-0212 vdb-entry
- 51040 third-party-advisory
- oval:org.mitre.oval:def:12210 vdb-entry signature
- 50858 third-party-advisory
- MDVSA-2010:216 vendor-advisory
- http://bugs.python.org/issue9129
- 44533 vdb-entry
- SUSE-SR:2011:002 vendor-advisory
- [oss-security] 20100924 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases mailing-list
- USN-1596-1 vendor-advisory
- [oss-security] 20100922 Re: CVE Request -- Python -- accept() implementation in async core is broken => more subcases mailing-list
- http://bugs.python.org/issue6706
- [oss-security] 20100909 CVE Request -- Python -- accept() implementation in async core is broken => more subcases mailing-list
- USN-1613-2 vendor-advisory
- SUSE-SR:2010:024 vendor-advisory
- http://svn.python.org/view?view=rev&revision=84289
- 51024 third-party-advisory
- USN-1613-1 vendor-advisory
- MDVSA-2010:215 vendor-advisory