Ubuntu.comUB:CVE-2013-7040CVE-2013-7040
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
0.003 Low
EPSS
Percentile
67.4%
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 | 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. |
Related
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
0.003 Low
EPSS
Percentile
67.4%