3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
116 lines
3.9 KiB
Text
116 lines
3.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-06:06.kmem Security Advisory
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The FreeBSD Project
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Topic: Local kernel memory disclosure
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Category: core
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Module: kernel
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Announced: 2006-01-25
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Credits: Xin LI, Karl Janmar
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Affects: FreeBSD 5.4-STABLE and FreeBSD 6.0
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Corrected: 2006-01-25 10:00:59 UTC (RELENG_6, 6.0-STABLE)
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2006-01-25 10:01:26 UTC (RELENG_6_0, 6.0-RELEASE-p4)
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2006-01-25 10:01:47 UTC (RELENG_5, 5.4-STABLE)
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CVE Name: CVE-2006-0379, CVE-2006-0380
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit
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<URL:http://www.freebsd.org/security/>.
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I. Background
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The network sub-system commonly utilizes the ioctl(2) mechanism to pass
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information regarding the current state and statistics of logical and
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physical network devices.
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II. Problem Description
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A buffer allocated from the kernel stack may not be completely
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initialized before being copied to userland. [CVE-2006-0379]
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A logic error in computing a buffer length may allow too much data to
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be copied into userland. [CVE-2006-0380]
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III. Impact
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Portions of kernel memory may be disclosed to local users. Such
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memory might contain sensitive information, such as portions of the
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file cache or terminal buffers. This information might be directly
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useful, or it might be leveraged to obtain elevated privileges in
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some way. For example, a terminal buffer might include a user-entered
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password.
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IV. Workaround
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No workaround is available.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to 5-STABLE or 6-STABLE, or to the
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RELENG_6_0 security branch dated after the correction date.
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2) To patch your present system:
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The following patches have been verified to apply to FreeBSD 5.4 and 6.0
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systems.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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[FreeBSD 5.4-STABLE and 6.0-STABLE]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem.patch.asc
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[FreeBSD 6.0-RELEASE]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem60.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:06/kmem60.patch.asc
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b) Apply the patch.
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the
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system.
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in FreeBSD.
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_5
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src/sys/net/if_bridge.c 1.23.2.7
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RELENG_6
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src/sys/net/if_bridge.c 1.11.2.24
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RELENG_6_0
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src/UPDATING 1.416.2.3.2.9
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src/sys/conf/newvers.sh 1.69.2.8.2.5
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src/sys/net/if_bridge.c 1.11.2.12.2.4
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src/sys/net80211/ieee80211_ioctl.c 1.25.2.3.2.2
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0379
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0380
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The latest revision of this advisory is available at
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ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:06.kmem.asc
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