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)
113 lines
3.8 KiB
Text
113 lines
3.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-EN-09:01.kenv Errata Notice
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The FreeBSD Project
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Topic: Kernel panic when dumping environment
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Category: core
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Module: kern
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Announced: 2009-03-23
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Affects: FreeBSD 7.x
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Corrected: 2009-03-23 00:00:50 UTC (RELENG_7, 7.2-PRERELEASE)
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2009-03-23 00:00:50 UTC (RELENG_7_1, 7.1-RELEASE-p4)
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2009-03-23 00:00:50 UTC (RELENG_7_0, 7.0-RELEASE-p11)
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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 <URL:http://security.FreeBSD.org/>.
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I. Background
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The kenv(2) system call allows userland processes to get, set, and unset
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kernel environment variables, as well as to dump all of the entries in
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the kernel environment.
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II. Problem Description
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When dumping all of the entries in the kernel environment, the kernel
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does not adequately bounds-check the size of the buffer into which the
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environment should be written.
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III. Impact
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An unprivileged process can cause the FreeBSD kernel to attempt to
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allocate a very large amount of memory, thereby causing the FreeBSD
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kernel to panic.
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IV. Workaround
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No workaround is available, but systems without untrusted local users
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are not vulnerable.
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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 7-STABLE, or to the RELENG_7_1
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or RELENG_7_0 security branch dated after the correction date.
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2) To patch your present system:
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The following patch has been verified to apply to FreeBSD 7.0 and 7.1
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systems.
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a) Download the patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch http://security.FreeBSD.org/patches/EN-09:01/kenv.patch
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# fetch http://security.FreeBSD.org/patches/EN-09:01/kenv.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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CVS:
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_7
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src/sys/kern/kern_environment.c 1.47.2.1
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RELENG_7_1
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src/UPDATING 1.507.2.13.2.7
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src/sys/conf/newvers.sh 1.72.2.9.2.8
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src/sys/kern/kern_environment.c 1.47.6.2
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RELENG_7_0
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src/UPDATING 1.507.2.3.2.15
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src/sys/conf/newvers.sh 1.72.2.5.2.15
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src/sys/kern/kern_environment.c 1.47.4.1
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- -------------------------------------------------------------------------
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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/7/ r190301
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releng/7.1/ r190301
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releng/7.0/ r190301
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- -------------------------------------------------------------------------
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VII. References
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-EN-09:01.kenv.asc
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