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TITLE:
FreeBSD sys_dev_random Random Data Replay Vulnerability

SECUNIA ADVISORY ID:
SA27879

VERIFY ADVISORY:
http://secunia.com/advisories/27879/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
>From local network

OPERATING SYSTEM:
FreeBSD 6.x
http://secunia.com/product/6778/
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 4.x
http://secunia.com/product/139/

DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious people to disclose potentially sensitive information.

The vulnerability is caused due to an error within the sys_dev_random
module when supplying random data. This can be exploited to determine
fragments of random data previously generated and e.g. break a
cryptographic algorithm that uses the random or urandom device.

The vulnerability affects all supported versions of FreeBSD.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2007-11-29 16:05:38 UTC (RELENG_7, 7.0-BETA4)
2007-11-29 16:06:12 UTC (RELENG_6, 6.3-PRERELEASE)
2007-11-29 16:06:54 UTC (RELENG_6_3, 6.3-RC2)
2007-11-29 16:07:30 UTC (RELENG_6_2, 6.2-RELEASE-p9)
2007-11-29 16:07:54 UTC (RELENG_6_1, 6.1-RELEASE-p21)
2007-11-29 16:08:54 UTC (RELENG_5, 5.5-STABLE)
2007-11-29 16:09:26 UTC (RELENG_5_5, 5.5-RELEASE-p17)

Patch for FreeBSD 5.5, 6.1, and 6.2:
http://security.FreeBSD.org/patches/SA-07:09/random.patch
http://security.FreeBSD.org/patches/SA-07:09/random.patch.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Robert Woolley.

ORIGINAL ADVISORY:
http://security.FreeBSD.org/advisories/FreeBSD-SA-07:09.random.asc

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