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Bug 469988 (CVE-2013-2099) - <dev-lang/python:{3.2.5-r1,3.3.2-r1}: ssl.match_hostname() DoS via certificates with specially crafted hostname wildcard patterns (CVE-2013-2099)
Summary: <dev-lang/python:{3.2.5-r1,3.3.2-r1}: ssl.match_hostname() DoS via certificat...
Alias: CVE-2013-2099
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Whiteboard: A3 [glsa]
Depends on:
Reported: 2013-05-15 18:42 UTC by Agostino Sarubbo
Modified: 2014-01-06 21:28 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Agostino Sarubbo gentoo-dev 2013-05-15 18:42:05 UTC
From ${URL} :

A denial of service flaw was found in the way SSL module implementation of Python3, version 3 of 
the Python programming language (aka Python 3000), performed matching of the certificate's name in 
the case it contained many '*' wildcard characters. A remote attacker, able to obtain valid 
certificate with its name containing a lot of '*' wildcard characters could use this flaw to cause 
denial of service (excessive CPU consumption) by issuing request to validate such a certificate for 
/ to an application using the Python's ssl.match_hostname() functionality.

Upstream bug report:

CVE request:
[2] (is for 
python-backports-ssl_match_hostname, but that code comes from Python 3.2 ssl module implementation)


This issue was discovered by Florian Weimer of Red Hat Product Security Team

@maintainer(s): after the bump, in case we need to stabilize the package, please say explicitly if it is ready for the stabilization or not.
Comment 1 Dirkjan Ochtman gentoo-dev 2013-05-15 20:15:56 UTC
Don't know who inserted the Python 3000 mention here, but that codename is long gone and certainly doesn't make sense in this kind of message. </grumpy>
Comment 2 Chris Reffett (RETIRED) gentoo-dev Security 2013-07-02 21:50:21 UTC
Upstream patches available for 3.2 [1] and 3.3 [2].

Comment 3 Mike Gilbert gentoo-dev 2013-07-02 23:07:51 UTC
Thanks. I'll work on backporting them.
Comment 4 Mike Gilbert gentoo-dev 2013-07-03 00:23:47 UTC
+*python-3.2.5-r1 (03 Jul 2013)
+*python-3.3.2-r1 (03 Jul 2013)
+  03 Jul 2013; Mike Gilbert <>
+  +files/python-3.2-CVE-2013-2099.patch, +files/python-3.3-CVE-2013-2099.patch,
+  +python-3.2.5-r1.ebuild, +python-3.3.2-r1.ebuild:
+  Add patch to fix CVE-2013-2099, bug 469988.

We can stabilize python-3.2.5-r1.

python-3.3* is not stable yet, so skip it.
Comment 5 Chris Reffett (RETIRED) gentoo-dev Security 2013-07-03 00:45:41 UTC
Sounds good to me. Arches, please stable =dev-lang/python-3.2.5-r1, target arches: alpha amd64 arm hppa ia64 m68k ppc ppc64 s390 sh sparc x86. Thanks!
Comment 6 Agostino Sarubbo gentoo-dev 2013-07-03 10:30:47 UTC
amd64 stable
Comment 7 Agostino Sarubbo gentoo-dev 2013-07-03 10:31:19 UTC
x86 stable
Comment 8 Agostino Sarubbo gentoo-dev 2013-07-04 13:04:38 UTC
ppc stable
Comment 9 Jeroen Roovers gentoo-dev 2013-07-04 13:55:03 UTC
Stable for HPPA.
Comment 10 Agostino Sarubbo gentoo-dev 2013-07-04 14:13:41 UTC
ppc64 stable
Comment 11 Agostino Sarubbo gentoo-dev 2013-07-06 17:08:16 UTC
alpha stable
Comment 12 Agostino Sarubbo gentoo-dev 2013-07-07 12:06:50 UTC
arm stable
Comment 13 Agostino Sarubbo gentoo-dev 2013-07-07 15:20:39 UTC
ia64 stable
Comment 14 Agostino Sarubbo gentoo-dev 2013-07-21 17:40:20 UTC
sh stable
Comment 15 Agostino Sarubbo gentoo-dev 2013-07-22 08:52:50 UTC
sparc stable
Comment 16 Agostino Sarubbo gentoo-dev 2013-08-06 12:32:33 UTC
s390 stable
Comment 17 Mike Gilbert gentoo-dev 2013-08-18 18:36:18 UTC
+*python-3.3.2-r2 (18 Aug 2013)
+  18 Aug 2013; Mike Gilbert <>
+  +files/CVE-2013-4073_py33.patch, +python-3.3.2-r2.ebuild:
+  Use Arfrever's patchset, bug 354877. Apply fix for CVS-2013-4238, bug 480856.
Comment 18 Mike Gilbert gentoo-dev 2013-08-18 18:36:55 UTC
(In reply to Mike Gilbert from comment #17)

Sorry, wrong bug.
Comment 19 Chris Reffett (RETIRED) gentoo-dev Security 2013-09-18 03:34:23 UTC
m68k timeout. @maintainers: please clean up affected versions, but leave the latest stable m68k version, drop all other keywords. GLSA request filed.
Comment 20 Arfrever Frehtes Taifersar Arahesis 2013-09-19 08:53:04 UTC
(In reply to Chris Reffett from comment #19)

Gentoo Council on 2013-09-17 destabilized whole m68k architecture.
Comment 21 Chris Reffett (RETIRED) gentoo-dev Security 2013-09-22 14:24:32 UTC
Okay then. @maintainers: cleanup.
Comment 22 GLSAMaker/CVETool Bot gentoo-dev 2013-10-15 03:27:58 UTC
CVE-2013-2099 (
  Algorithmic complexity vulnerability in the ssl.match_hostname function in
  Python 3.2.x, 3.3.x, and earlier, and unspecified versions of
  python-backports-ssl_match_hostname as used for older Python versions,
  allows remote attackers to cause a denial of service (CPU consumption) via
  multiple wildcard characters in the common name in a certificate.
Comment 23 Yury German Gentoo Infrastructure gentoo-dev Security 2013-12-30 06:54:26 UTC
Maintainer(s), Thank you for your work!

Added to existing GLSA draft.
Comment 24 GLSAMaker/CVETool Bot gentoo-dev 2014-01-06 21:28:16 UTC
This issue was resolved and addressed in
 GLSA 201401-04 at
by GLSA coordinator Sergey Popov (pinkbyte).