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Ubuntu: USN-1984-1 Critical: Python 3.2 Denial Of Service and Mitm

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Calendar Grey October 1, 2013
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Important patch for Python 3.2 resolves several security flaws impacting Ubuntu versions 12.04 and 12.10.
Several security issues were fixed in Python.

Summary

Several security issues were fixed in Python.

Software Description:

- python3.2: An interactive high-level object-oriented language

Details:

Florian Weimer discovered that Python incorrectly handled matching multiple

wildcards in ssl certificate hostnames. An attacker could exploit this to

cause Python to consume resources, resulting in a denial of service.

(CVE-2013-2099)

Ryan Sleevi discovered that Python did not properly handle certificates

with NULL characters in the Subject Alternative Name field. An attacker

could exploit this to perform a man in the middle attack to view sensitive

information or alter encrypted communications. (CVE-2013-4238)

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu python man in the middle

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.10:
  python3.2                       3.2.3-6ubuntu3.4
  python3.2-minimal               3.2.3-6ubuntu3.4

Ubuntu 12.04 LTS:
  python3.2                       3.2.3-0ubuntu3.5
  python3.2-minimal               3.2.3-0ubuntu3.5

In general, a standard system update will make all the necessary changes.

References

CVE-2013-2099, CVE-2013-4238

Severity
critical
Lowest
Low
Medium
High
Critical

October 01, 2013

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu python man in the middle

Package Information

https://launchpad.net/ubuntu/+source/python3.2/3.2.3-6ubuntu3.4
https://launchpad.net/ubuntu/+source/python3.2/3.2.3-0ubuntu3.5

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