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CVE-2013-7040

Description

Python 2.7 before 3.4 only uses the last eight bits of the prefix to randomize hash values, which causes it to compute hash values without restricting the ability to trigger hash collisions predictably and makes it easier for context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-1150. #### Bugs * <http://bugs.python.org/issue14621> * <https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/1351224> #### Notes Author| Note ---|--- [mdeslaur](<https://launchpad.net/~mdeslaur>) | This is being fixed upstream by changing the hashing algorithm to SipHash in python 3.4. See http://www.python.org/dev/peps/pep-0456/ Upstream has no intention of backporting this change to stable releases. We will not be fixing this in older releases.


Affected Package


OS OS Version Package Name Package Version
ubuntu upstream python2.6 any
ubuntu upstream python2.7 any
ubuntu upstream python3.1 any
ubuntu upstream python3.2 any
ubuntu upstream python3.3 any

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