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FreeBSD "arc4random()" Insufficient Entropy Sources Security Issue

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Release Date:  2008-11-25    Views:  5,781

Secunia Advisory SA32871

Where:

From remote

Impact:

Brute force

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

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.

Further details available to Secunia VIM customers

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

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

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