Python 'ssl.match_hostname()' Function Security Bypass Vulnerability

Bugtraq ID:	74707
Class:	Failure to Handle Exceptional Conditions
CVE:	CVE-2013-7440
Remote:	Yes
Local:	No
Published:	May 17 2015 12:00AM
Updated:	Oct 26 2016 01:01AM
Credit:	Martin Prpic
Vulnerable:	Python Software Foundation Python 3.3.3 Python Software Foundation Python 3.3 Python Software Foundation Python 3.4 Python Software Foundation Python 3.3.4 Python Software Foundation Python 3.3.2 Python Software Foundation Python 3.3.1 IBM PowerKVM 3.1 IBM PowerKVM 2.1
Not Vulnerable:

Python 'ssl.match_hostname()' Function Security Bypass Vulnerability

Python is prone to a security-bypass vulnerability.
Successful exploits may allow attackers to bypass certain intended security restrictions and perform unauthorized actions which may aid in launching further attacks.

Python 'ssl.match_hostname()' Function Security Bypass Vulnerability

Currently, we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Python 'ssl.match_hostname()' Function Security Bypass Vulnerability

Solution:
Updates are available. Please see the references or vendor advisory for more information.

Python 'ssl.match_hostname()' Function Security Bypass Vulnerability

References:

• changeset 86676:10d0edadbcdd (Python)
  
• Python Homepage (Python Software Foundation)
  
• Bug 1224999 - (CVE-2013-7440) CVE-2013-7440 python: wildcard matching rules do (Bugzilla)
  
• isg3T1024236:Vulnerabilities in Python affect PowerKVM (IBM)
  
• ssl.match_hostname(): sub string wildcard should not match IDNA prefix (Python)