Bug 224445 - CVE-2007-0493 BIND might crash after attempting to read free()-ed memory
Summary: CVE-2007-0493 BIND might crash after attempting to read free()-ed memory
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: bind
Version: 5.0
Hardware: All
OS: Linux
Target Milestone: ---
: ---
Assignee: Adam Tkac
QA Contact: Ben Levenson
URL: http://marc.theaimsgroup.com/?l=bind-...
Whiteboard: impact=low,source=gentoo,public=20070...
: 238117 (view as bug list)
Depends On:
Blocks: CVE-2007-0493 238117
TreeView+ depends on / blocked
Reported: 2007-01-25 19:06 UTC by Lubomir Kundrak
Modified: 2013-04-30 23:35 UTC (History)
2 users (show)

Fixed In Version: RHSA-2007-0057
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2007-03-14 14:55:27 UTC

Attachments (Terms of Use)
proposed fix (2.72 KB, patch)
2007-01-31 14:12 UTC, Martin Stransky
no flags Details | Diff

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2007:0057 normal SHIPPED_LIVE Moderate: bind security update 2007-03-14 14:55:24 UTC

Description Lubomir Kundrak 2007-01-25 19:06:43 UTC
+++ This bug was initially created as a clone of Bug #224443 +++

Description of problem:

fetchctx structures,  not keeping count of its uses, might be read
even after beind deallocated resulting in name server denial of
service under certain circumstances.

Version-Release number of selected component (if applicable):

Unclear whether this issue also affects 3.2 BIND, besides 3.3.
For sure affects FC-5, FC-6 and RHEL-5

How reproducible:

Hardly ever.

Steps to Reproduce:

No known way to reproduce. The advisory notes, that the issue can be
partly mitigated by disabling recursion, so probably some deep recursive
queries might trigger the bug?
Actual results:

Server DoS?

Expected results:

What would you expect from read of deallocated memory? :)

Additional info:

ISC is not particularly good at providing either patches or information
about the flaws. The attached patch incorporates another fix which
changes roughly the same code.

-- Additional comment from lkundrak@redhat.com on 2007-01-25 14:04 EST --
Created an attachment (id=146596)
Fix for BIND out-of bound read DoS sucked from upstream BIND release

Comment 1 Martin Stransky 2007-01-31 14:12:05 UTC
Created attachment 147023 [details]
proposed fix

Comment 5 Red Hat Bugzilla 2007-03-14 14:55:27 UTC
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


Comment 7 Adam Tkac 2007-05-24 12:46:27 UTC
*** Bug 238117 has been marked as a duplicate of this bug. ***

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