Bug 824600 (CVE-2012-2921)

Summary:	CVE-2012-2921 python-feedparser: DoS via memory consumption processing ENTITY declarations
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bugs.michael, jpopelka, karlthered, lmacken, louiz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:	impact=moderate,public=20120502,reported=20120523,source=debian,cvss2=4.3/AV:N/AC:M/Au:N/C:N/I:N/A:P,fedora-all/python-feedparser=affected,epel-all/python-feedparser=affected
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-08-05 04:16:31 EDT	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---
Bug Depends On:	824602, 824604
Bug Blocks:

Description Vincent Danen 2012-05-23 15:54:29 EDT

A denial of service flaw was reported and fixed in feedparser, a module for parsing atom and RSS feeds in python.  Previously, ENTITY declarations could be used to create a denial of service through exponential memory consumption, by allowing such declarations to hide in non-ASCII-compatible encoded documents.  Feedparser now first normalizes the encoding and then replaces the DOCTYPE and ENTITY declarations.

This is corrected in upstream version 5.1.2 [1] and svn r703 [2].

[1] http://freecode.com/projects/feedparser/releases/344371
[2] https://code.google.com/p/feedparser/source/detail?r=703&path=/trunk/feedparser/feedparser.py

Comment 1 Vincent Danen 2012-05-23 15:55:42 EDT

Created python-feedparser tracking bugs for this issue

Affects: fedora-all [bug 824602]
Affects: epel-all [bug 824604]

Comment 2 Fedora Update System 2012-06-01 13:14:48 EDT

python-feedparser-5.1.2-2.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 3 Haïkel Guémar 2012-08-05 04:16:31 EDT

The bugfixes have been pushed to currently supported releases.