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TITLE:
FreeBSD "arc4random()" Insufficient Entropy Sources Security Issue

SECUNIA ADVISORY ID:
SA32871

VERIFY ADVISORY:
http://secunia.com/advisories/32871/

CRITICAL:
Less critical

IMPACT:
Brute force

WHERE:
>From remote

OPERATING SYSTEM:
FreeBSD 6.x
http://secunia.com/advisories/product/6778/

DESCRIPTION:
FreeBSD has acknowledged a security issue, which can be exploited by
malicious people to conduct brute force attacks.

The security issue is caused due to the "arc4random()" function using
insufficiently random entropy sources within the first 5 minutes after
starting the boot process or until collecting enough random data. This
weakens applications and processes relying on the security of
"arc4random()" (e.g. when creating IVs for WEP, creating IP packet
identifiers, kernel RPC transaction identifiers, and within GEOM ELI
and GEOM shsec providers).

SOLUTION:
Update FreeBSD or apply patches.

Note: GEOM shsec providers created within the vulnerable time period
have to be recreated after patching the system.

2008-11-24 17:39:39 UTC (RELENG_7, 7.1-PRERELEASE)
2008-11-24 17:39:39 UTC (RELENG_7_0, 7.0-RELEASE-p6)
2008-11-24 17:39:39 UTC (RELENG_6, 6.4-STABLE)
2008-11-24 17:39:39 UTC (RELENG_6_4, 6.4-RELEASE)
2008-11-24 17:39:39 UTC (RELENG_6_3, 6.3-RELEASE-p6)

FreeBSD 6.x:
http://security.FreeBSD.org/patches/SA-08:11/arc4random6x.patch

FreeBSD 7.x:
fetch http://security.FreeBSD.org/patches/SA-08:11/arc4random.patch

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Robert Woolley, Mark Murray, Maxim Dounin, and
Ruslan Ermilov.

ORIGINAL ADVISORY:
FreeBSD-SA-08.11.arc4random:
http://security.freebsd.org/advisories/FreeBSD-SA-08:11.arc4random.asc

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