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2005.05.11 09:57
FreeBSD Security Advisory FreeBSD-SA-05:07.ldt
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=============================================================================
FreeBSD-SA-05:07.ldt Security Advisory
The FreeBSD Project
Topic: Local kernel memory disclosure in i386_get_ldt
Category: core
Module: sys_i386
Announced: 2005-05-06
Credits: Christer Oberg
Affects: All FreeBSD/i386 4.x releases since 4.7-RELEASE
All FreeBSD/i386 5.x and FreeBSD/amd64 5.x releases
prior to 5.4-RELEASE
Corrected: 2005-05-06 02:40:19 UTC (RELENG_5, 5.4-STABLE)
2005-05-06 02:40:49 UTC (RELENG_5_4, 5.4-RELEASE)
2005-05-06 02:40:32 UTC (RELENG_5_3, 5.3-RELEASE-p12)
2005-05-06 02:39:35 UTC (RELENG_4, 4.11-STABLE)
2005-05-06 02:40:05 UTC (RELENG_4_11, 4.11-RELEASE-p6)
2005-05-06 02:39:52 UTC (RELENG_4_10, 4.10-RELEASE-p11)
CVE Name: CAN-2005-1400
For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>.
I. Background
The i386_get_ldt(2) system call allows a process to request that a portion of its Local Descriptor Table be copied from the kernel into userland.
II. Problem Description
The i386_get_ldt(2) syscall performs insufficient validation of its input arguments. In particular, negative or very large values may allow inappropriate data to be copied from the kernel.
III. Impact
Kernel memory may be disclosed to the user process. Such memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way. For example, a terminal buffer might include a user-entered password.
IV. Workaround
No workaround is known for i386 and amd64 systems; other platforms are not affected by this issue.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 4.10, 4.11, and 5.3 systems.
a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.
[FreeBSD 4.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch.asc
[FreeBSD 5.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch.asc
b) Apply the patch.
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in <URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the system.
VI. Correction details
The following list contains the revision numbers of each file that was corrected in FreeBSD.
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_4
src/sys/i386/i386/sys_machdep.c 1.47.2.4
RELENG_4_11
src/UPDATING 1.73.2.91.2.7
src/sys/conf/newvers.sh 1.44.2.39.2.10
src/sys/i386/i386/sys_machdep.c 1.47.2.3.8.1
RELENG_4_10
src/UPDATING 1.73.2.90.2.12
src/sys/conf/newvers.sh 1.44.2.34.2.13
src/sys/i386/i386/sys_machdep.c 1.47.2.3.6.1
RELENG_5
src/sys/i386/i386/sys_machdep.c 1.92.2.3
RELENG_5_4
src/UPDATING 1.342.2.24.2.6
src/sys/i386/i386/sys_machdep.c 1.92.2.1.2.1
RELENG_5_3
src/UPDATING 1.342.2.13.2.15
src/sys/conf/newvers.sh 1.62.2.15.2.17
src/sys/i386/i386/sys_machdep.c 1.92.4.1
- -------------------------------------------------------------------------
The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:07.ldt.asc
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Hash: SHA1
=============================================================================
FreeBSD-SA-05:07.ldt Security Advisory
The FreeBSD Project
Topic: Local kernel memory disclosure in i386_get_ldt
Category: core
Module: sys_i386
Announced: 2005-05-06
Credits: Christer Oberg
Affects: All FreeBSD/i386 4.x releases since 4.7-RELEASE
All FreeBSD/i386 5.x and FreeBSD/amd64 5.x releases
prior to 5.4-RELEASE
Corrected: 2005-05-06 02:40:19 UTC (RELENG_5, 5.4-STABLE)
2005-05-06 02:40:49 UTC (RELENG_5_4, 5.4-RELEASE)
2005-05-06 02:40:32 UTC (RELENG_5_3, 5.3-RELEASE-p12)
2005-05-06 02:39:35 UTC (RELENG_4, 4.11-STABLE)
2005-05-06 02:40:05 UTC (RELENG_4_11, 4.11-RELEASE-p6)
2005-05-06 02:39:52 UTC (RELENG_4_10, 4.10-RELEASE-p11)
CVE Name: CAN-2005-1400
For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>.
I. Background
The i386_get_ldt(2) system call allows a process to request that a portion of its Local Descriptor Table be copied from the kernel into userland.
II. Problem Description
The i386_get_ldt(2) syscall performs insufficient validation of its input arguments. In particular, negative or very large values may allow inappropriate data to be copied from the kernel.
III. Impact
Kernel memory may be disclosed to the user process. Such memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way. For example, a terminal buffer might include a user-entered password.
IV. Workaround
No workaround is known for i386 and amd64 systems; other platforms are not affected by this issue.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 4.10, 4.11, and 5.3 systems.
a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.
[FreeBSD 4.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt4.patch.asc
[FreeBSD 5.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:07/ldt5.patch.asc
b) Apply the patch.
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in <URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the system.
VI. Correction details
The following list contains the revision numbers of each file that was corrected in FreeBSD.
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_4
src/sys/i386/i386/sys_machdep.c 1.47.2.4
RELENG_4_11
src/UPDATING 1.73.2.91.2.7
src/sys/conf/newvers.sh 1.44.2.39.2.10
src/sys/i386/i386/sys_machdep.c 1.47.2.3.8.1
RELENG_4_10
src/UPDATING 1.73.2.90.2.12
src/sys/conf/newvers.sh 1.44.2.34.2.13
src/sys/i386/i386/sys_machdep.c 1.47.2.3.6.1
RELENG_5
src/sys/i386/i386/sys_machdep.c 1.92.2.3
RELENG_5_4
src/UPDATING 1.342.2.24.2.6
src/sys/i386/i386/sys_machdep.c 1.92.2.1.2.1
RELENG_5_3
src/UPDATING 1.342.2.13.2.15
src/sys/conf/newvers.sh 1.62.2.15.2.17
src/sys/i386/i386/sys_machdep.c 1.92.4.1
- -------------------------------------------------------------------------
The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:07.ldt.asc
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