CVE-2013-7040

Severity

43%

Complexity

86%

Confidentiality

48%

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.

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.

CVSS 2.0 Base Score 4.3. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P).

Overview

First reported 10 years ago

2014-05-19 14:55:00

Last updated 5 years ago

2019-10-25 11:53:00

Affected Software

Apple Mac OS X

Python 2.7.1

2.7.1

Python 2.7.1 Release Candiate 1

2.7.1

Python 2.7.2 Release Candidate 1

2.7.2

Python 2.7.3

2.7.3

Python 2.7.4

2.7.4

Python 2.7.5

2.7.5

Python 2.7.6

2.7.6

Python 2.7.7

2.7.7

Python 2.7.1150

2.7.1150

Python 2.7.2150

2.7.2150

Python 3.0

3.0

Python 3.0.1

3.0.1

Python 3.1

3.1

Python 3.1.1

3.1.1

Python 3.1.2

3.1.2

Python 3.1.3

3.1.3

Python 3.1.4

3.1.4

Python 3.1.5

3.1.5

Python 3.2

3.2

Python 3.2-alpha

3.2

Python 3.2.0

3.2.0

Python 3.2.1

3.2.1

Python 3.2.2

3.2.2

Python 3.2.3

3.2.3

Python 3.2.4

3.2.4

Python 3.2.5

3.2.5

Python 3.2.2150

3.2.2150

Python 3.3

3.3

Python 3.3 beta 2

3.3

Python 3.3.0

3.3.0

Python 3.3.1

3.3.1

Python 3.3.1 release candidate 1

3.3.1

Python 3.3.2

3.3.2

Python 3.3.3

3.3.3

Python 3.3. release candidate 1

3.3.3

Python 3.3.3 release candidate 2

3.3.3

Python 3.3.4

3.3.4

Python 3.3.4 release candidate 1

3.3.4

Python 3.3.5

3.3.5

Python 3.3.5 release candidate 1

3.3.5

Python 3.3.5 release candidate 2

3.3.5

References

http://bugs.python.org/issue14621

APPLE-SA-2015-08-13-2

[oss-security] 20131209 Re: CPython hash secret can be recoved remotely

[oss-security] 20131209 CPython hash secret can be recoved remotely

64194

https://support.apple.com/kb/HT205031

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