SB2014051901 - Cryptographic issues in Python

Description

This security bulletin contains information about 1 security vulnerability.

1) Cryptographic issues (CVE-ID: CVE-2013-7040)

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

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.

Remediation

Install update from vendor's website.

References

• http://bugs.python.org/issue14621
• http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
• http://www.openwall.com/lists/oss-security/2013/12/09/13
• http://www.openwall.com/lists/oss-security/2013/12/09/3
• http://www.securityfocus.com/bid/64194
• https://support.apple.com/kb/HT205031