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FreeBSD sys_dev_random Random Data Replay Vulnerability
Secunia Advisory: SA27879
Release Date: 2007-11-30
Popularity: 5,957 views

Critical:
Less critical
Impact: Exposure of sensitive information
Where: From local network
Solution Status: Vendor Patch

OS:FreeBSD 4.x
FreeBSD 5.x
FreeBSD 6.x

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CVE reference:CVE-2007-6150


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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