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FreeBSD-SA-11:07.chroot Security Advisory
The FreeBSD Project
Topic: Code execution via chrooted ftpd
Category: core
Module: libc
Announced: 2011-12-23
Affects: All supported versions of FreeBSD.
Corrected: 2011-12-23 15:00:37 UTC (RELENG_7, 7.4-STABLE)
2011-12-23 15:00:37 UTC (RELENG_7_4, 7.4-RELEASE-p5)
2011-12-23 15:00:37 UTC (RELENG_7_3, 7.3-RELEASE-p9)
2011-12-23 15:00:37 UTC (RELENG_8, 8.2-STABLE)
2011-12-23 15:00:37 UTC (RELENG_8_2, 8.2-RELEASE-p5)
2011-12-23 15:00:37 UTC (RELENG_8_1, 8.1-RELEASE-p7)
2011-12-23 15:00:37 UTC (RELENG_9, 9.0-STABLE)
2011-12-23 15:00:37 UTC (RELENG_9_0, 9.0-RELEASE)
For general information regarding FreeBSD Security Advisories, I. Background Chroot is an operation that changes the apparent root directory for the The nsdispatch(3) API implementation has a feature to reload its II. Problem Description The nsdispatch(3) API has no mechanism to alert it to whether it is The FreeBSD ftpd(8) daemon can be configured to use chroot(2), and III. Impact If ftpd is configured to place a user in a chroot environment, then an IV. Workaround Don't use ftpd with the chroot option. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 7-STABLE or 8-STABLE, or to 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to FreeBSD 7.4, 7.3, a) Download the relevant patch from the location below, and verify the [FreeBSD 7.3 and 7.4] [FreeBSD 8.1 and 8.2] b) Execute the following commands as root: # cd /usr/src c) Recompile the operating system as described in 3) To update your vulnerable system via a binary patch: Systems running 7.4-RELEASE, 7.3-RELEASE, 8.2-RELEASE, or 8.1-RELEASE on # freebsd-update fetch 4) This update adds a new API, __FreeBSD_libc_enter_restricted_mode() VI. Correction details The following list contains the revision numbers of each file that was CVS: Branch Revision Subversion: Branch/path Revision VII. References The latest revision of this advisory is available at iEYEARECAAYFAk70nOoACgkQFdaIBMps37ILmgCgjVxRH+NsPpnXOVdwWmuxlSDp
including descriptions of the fields above, security branches, and the
following sections, please visit
current process and its children. The chroot(2) system call is widely
used in many applications as a measure of limiting a process's access to
the file system, as part of implementing privilege separation.
configuration on demand. This feature may also load shared libraries
and run code provided by the library when requested by the configuration
file.
operating within a chroot environment in which the standard paths for
configuration files and shared libraries may be untrustworthy.
also uses the nsdispatch(3) API.
attacker who can log in as that user may be able to run arbitrary code
with elevated ("root") privileges.
the RELENG_8_2, RELENG_8_1, RELENG_7_4, or RELENG_7_3 security
branch dated after the correction date.
8.2 and 8.1 systems.
detached PGP signature using your PGP utility.
# fetch http://security.FreeBSD.org/patches/SA-11:07/chroot7.patch
# fetch http://security.FreeBSD.org/patches/SA-11:07/chroot7.patch.asc
# fetch http://security.FreeBSD.org/patches/SA-11:07/chroot8.patch
# fetch http://security.FreeBSD.org/patches/SA-11:07/chroot8.patch.asc
# patch < /path/to/patch
system.
the i386 or amd64 platforms can be updated via the freebsd-update(8)
utility:
# freebsd-update install
to the C library, which completely disables loading of shared libraries
upon return. Applications doing chroot(2) jails need to be updated
to call this API explicitly right after the chroot(2) operation as a
safety measure.
corrected in FreeBSD.
Path
- -------------------------------------------------------------------------
RELENG_7
src/include/unistd.h 1.80.2.4
src/lib/libc/include/libc_private.h 1.17.2.4
src/lib/libc/Versions.def 1.3.2.3
src/lib/libc/net/nsdispatch.c 1.14.2.3
src/lib/libc/gen/Symbol.map 1.6.2.7
src/lib/libc/gen/Makefile.inc 1.128.2.6
src/lib/libc/gen/libc_dlopen.c 1.2.2.2
src/libexec/ftpd/popen.c 1.26.10.2
src/libexec/ftpd/ftpd.c 1.212.2.2
RELENG_7_4
src/UPDATING 1.507.2.36.2.7
src/sys/conf/newvers.sh 1.72.2.18.2.10
src/include/unistd.h 1.80.2.3.4.2
src/lib/libc/include/libc_private.h 1.17.2.3.4.2
src/lib/libc/Versions.def 1.3.2.2.4.2
src/lib/libc/net/nsdispatch.c 1.14.2.2.2.2
src/lib/libc/gen/Symbol.map 1.6.2.6.4.2
src/lib/libc/gen/Makefile.inc 1.128.2.5.4.2
src/lib/libc/gen/libc_dlopen.c 1.2.4.2
src/libexec/ftpd/popen.c 1.26.10.1.2.2
src/libexec/ftpd/ftpd.c 1.212.2.1.6.2
RELENG_7_3
src/UPDATING 1.507.2.34.2.11
src/sys/conf/newvers.sh 1.72.2.16.2.13
src/include/unistd.h 1.80.2.3.2.2
src/lib/libc/include/libc_private.h 1.17.2.3.2.2
src/lib/libc/Versions.def 1.3.2.2.2.2
src/lib/libc/net/nsdispatch.c 1.14.2.1.6.2
src/lib/libc/gen/Symbol.map 1.6.2.6.2.2
src/lib/libc/gen/Makefile.inc 1.128.2.5.2.2
src/lib/libc/gen/libc_dlopen.c 1.1.2.1
src/libexec/ftpd/popen.c 1.26.24.2
src/libexec/ftpd/ftpd.c 1.212.2.1.4.2
RELENG_8
src/include/unistd.h 1.95.2.2
src/lib/libc/include/libc_private.h 1.20.2.3
src/lib/libc/Versions.def 1.8.2.3
src/lib/libc/net/nsdispatch.c 1.18.2.3
src/lib/libc/gen/Symbol.map 1.21.2.6
src/lib/libc/gen/Makefile.inc 1.144.2.7
src/lib/libc/gen/libc_dlopen.c 1.1.4.2
src/libexec/ftpd/popen.c 1.26.22.3
src/libexec/ftpd/ftpd.c 1.214.2.3
RELENG_8_2
src/UPDATING 1.632.2.19.2.7
src/sys/conf/newvers.sh 1.83.2.12.2.10
src/include/unistd.h 1.95.2.1.6.2
src/lib/libc/include/libc_private.h 1.20.2.2.4.2
src/lib/libc/Versions.def 1.8.2.2.4.2
src/lib/libc/net/nsdispatch.c 1.18.2.2.2.2
src/lib/libc/gen/Symbol.map 1.21.2.5.2.2
src/lib/libc/gen/Makefile.inc 1.144.2.6.2.2
src/lib/libc/gen/libc_dlopen.c 1.2.8.2
src/libexec/ftpd/popen.c 1.26.22.2.4.2
src/libexec/ftpd/ftpd.c 1.214.2.1.6.2
RELENG_8_1
src/UPDATING 1.632.2.14.2.10
src/sys/conf/newvers.sh 1.83.2.10.2.11
src/include/unistd.h 1.95.2.1.4.2
src/lib/libc/include/libc_private.h 1.20.2.2.2.2
src/lib/libc/Versions.def 1.8.2.2.2.2
src/lib/libc/net/nsdispatch.c 1.18.2.1.4.2
src/lib/libc/gen/Symbol.map 1.21.2.3.2.2
src/lib/libc/gen/Makefile.inc 1.144.2.4.2.2
src/lib/libc/gen/libc_dlopen.c 1.2.10.2
src/libexec/ftpd/popen.c 1.26.22.2.2.2
src/libexec/ftpd/ftpd.c 1.214.2.1.4.2
RELENG_9
src/include/unistd.h 1.101.2.2
src/lib/libc/include/libc_private.h 1.26.2.2
src/lib/libc/Versions.def 1.9.2.2
src/lib/libc/net/nsdispatch.c 1.19.2.2
src/lib/libc/gen/Symbol.map 1.38.2.2
src/lib/libc/gen/Makefile.inc 1.159.2.2
src/lib/libc/gen/libc_dlopen.c 1.1.6.2
src/lib/libc/iconv/citrus_module.c 1.1.2.2
src/libexec/ftpd/popen.c 1.27.2.2
src/libexec/ftpd/ftpd.c 1.220.2.2
RELENG_9_0
src/include/unistd.h 1.101.2.1.2.2
src/lib/libc/include/libc_private.h 1.26.2.1.2.2
src/lib/libc/Versions.def 1.9.2.1.2.2
src/lib/libc/net/nsdispatch.c 1.19.2.1.2.2
src/lib/libc/gen/Symbol.map 1.38.2.1.2.2
src/lib/libc/gen/Makefile.inc 1.159.2.1.2.2
src/lib/libc/gen/libc_dlopen.c 1.2.6.2
src/lib/libc/iconv/citrus_module.c 1.1.2.1.2.2
src/libexec/ftpd/popen.c 1.27.2.1.2.2
src/libexec/ftpd/ftpd.c 1.220.2.1.2.2
- -------------------------------------------------------------------------
- -------------------------------------------------------------------------
stable/7/ r228843
releng/7.4/ r228843
releng/7.3/ r228843
stable/8/ r228843
releng/8.2/ r228843
releng/8.1/ r228843
stable/9/ r228843
releng/9.0/ r228843
- -------------------------------------------------------------------------
http://security.FreeBSD.org/advisories/FreeBSD-SA-11:07.chroot.asc
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