Bug 241888 - CVE-2007-2453 Slightly degraded pool mixing for entropy extraction
CVE-2007-2453 Slightly degraded pool mixing for entropy extraction
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
5.0
All Linux
urgent Severity low
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Assigned To: Don Howard
Martin Jenner
: Security
Depends On:
Blocks:
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Reported: 2007-05-31 10:38 EDT by Marcel Holtmann
Modified: 2007-11-30 17:07 EST (History)
5 users (show)

See Also:
Fixed In Version: RHSA-2007-0376
Doc Type: Bug Fix
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Last Closed: 2007-06-14 10:55:22 EDT
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Description Marcel Holtmann 2007-05-31 10:38:19 EDT
The random number generator in Linux kernels 2.6.12 up to 2.6.22 contain a
broken implementation that prevents a proper manual seeding of the generator.
When a Linux system boots without much operator interaction, the entropy pool
may be in a predictable state.

This issue only affects systems without a real time clock (RTC), harddrive
activity or user input during boot time. For these system the manual seeding of
the random generator is the only way to guarantee a proper entropy pool as early
as possible.

All other systems are not affected since the Linux kernel creates a big enough
entropy pool at boot. The manual seeding is not needed on these systems and has
no effect in increasing the randomness of the generator.
Comment 1 Don Howard 2007-06-01 19:32:51 EDT
A patch addressing this issue has been included in build 2.6.18-8.1.6.el5
Comment 4 Mike Gahagan 2007-06-08 15:42:27 EDT
verified the patch is in and looks to already be well tested.

Comment 7 Red Hat Bugzilla 2007-06-14 10:55:22 EDT
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.

http://rhn.redhat.com/errata/RHSA-2007-0376.html

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