CVE-2013-4238

Publication date 17 August 2013

Last updated 24 July 2024

Ubuntu priority

The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a ‘\0’ character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Read the notes from the security team

Status

Show unmaintained releases

No maintained releases are affected by this CVE.

Package	Ubuntu Release	Status
python2.6	13.04 raring	Not in release
	12.10 quantal	Not in release
	12.04 LTS precise	Not in release
	10.04 LTS lucid	Fixed 2.6.5-1ubuntu6.2
python2.7	13.04 raring	Fixed 2.7.4-2ubuntu3.2
	12.10 quantal	Fixed 2.7.3-5ubuntu4.3
	12.04 LTS precise	Fixed 2.7.3-0ubuntu3.4
	10.04 LTS lucid	Not in release
python3.1	13.04 raring	Not in release
	12.10 quantal	Not in release
	12.04 LTS precise	Not in release
	10.04 LTS lucid	Ignored end of life
python3.2	13.04 raring	Not in release
	12.10 quantal	Fixed 3.2.3-6ubuntu3.4
	12.04 LTS precise	Fixed 3.2.3-0ubuntu3.5
	10.04 LTS lucid	Not in release
python3.3	13.04 raring	Fixed 3.3.1-1ubuntu5.2
	12.10 quantal	Fixed 3.3.0-1ubuntu0.1
	12.04 LTS precise	Not in release
	10.04 LTS lucid	Not in release

Notes

jdstrand

reproducer in upstream report

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python2.6	Upstream: http://hg.python.org/cpython/rev/79007c4244d6 Upstream: http://hg.python.org/cpython/rev/50803d881a92 Upstream: http://hg.python.org/cpython/rev/07ee48ce4513
python2.7	Upstream: http://hg.python.org/cpython/rev/bd2360476bdb Upstream: http://hg.python.org/cpython/rev/1cd24ea5abeb Upstream: http://hg.python.org/cpython/rev/a7d5b86ffb95
python3.3	Upstream: http://hg.python.org/cpython/rev/7a0f398d1a5c Upstream: http://hg.python.org/cpython/rev/577e9402cadd Upstream: http://hg.python.org/cpython/rev/4e93f32176fb Upstream: http://hg.python.org/cpython/rev/c9f073e593b0 Upstream: http://hg.python.org/cpython/rev/004743d210e4 Upstream: http://hg.python.org/cpython/rev/90040e560527

References

Related Ubuntu Security Notices (USN)

USN-1985-1
Python 3.3 vulnerabilities
1 October 2013

USN-1984-1
Python 3.2 vulnerabilities
1 October 2013

USN-1983-1
Python 2.7 vulnerabilities
1 October 2013