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Category:   Application (Generic)  >   Python Vendors:
(Oracle Issues Fix for Solaris) Python Hash Table Collision Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1028423
SecurityTracker URL:
CVE Reference:   CVE-2012-1150   (Links to External Site)
Date:  Apr 11 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2.6.8, 2.7.x prior to 2.7.3, 3.x prior to 3.1.5, and 3.2.x prior to 3.2.3
Description:   A vulnerability was reported in Python. A remote user can cause denial of service conditions.

A remote user can send specially crafted POST request values to trigger hash collisions and cause significant performance degradation on the target server.

The original advisory is available at:

Alexander Klink of n.runs AG and Julian Walde of Technische Universitat Darmstadt reported this vulnerability. Scott A. Crosby and Dan S. Wallach of Rice University reported the theoretical attack.

Impact:   A remote user can cause performance to degrade on the target server.
Solution:   Oracle has issued a fix.

The Oracle advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Randomization error
Underlying OS:  UNIX (Solaris - SunOS)
Underlying OS Comments:  10, 11.1

Message History:   This archive entry is a follow-up to the message listed below.
Dec 29 2011 Python Hash Table Collision Bug Lets Remote Users Deny Service

 Source Message Contents

[Original Message Not Available for Viewing]

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