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)
144 lines
5.5 KiB
Text
144 lines
5.5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-06:12.opie Security Advisory
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The FreeBSD Project
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Topic: OPIE arbitrary password change
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Category: contrib
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Module: contrib_opie
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Announced: 2006-03-22
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Credits: Mykola Zubach
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Affects: All FreeBSD releases.
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Corrected: 2006-03-22 16:01:08 UTC (RELENG_6, 6.1-STABLE)
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2006-03-22 16:01:38 UTC (RELENG_6_0, 6.0-RELEASE-p6)
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2006-03-22 16:01:56 UTC (RELENG_5, 5.5-STABLE)
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2006-03-22 16:02:17 UTC (RELENG_5_4, 5.4-RELEASE-p13)
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2006-03-22 16:02:35 UTC (RELENG_5_3, 5.3-RELEASE-p28)
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2006-03-22 16:02:49 UTC (RELENG_4, 4.11-STABLE)
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2006-03-22 16:03:05 UTC (RELENG_4_11, 4.11-RELEASE-p16)
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2006-03-22 16:03:25 UTC (RELENG_4_10, 4.10-RELEASE-p22)
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CVE Name: CVE-2006-1283
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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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OPIE is a one-time password system designed to help to secure a system
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against replay attacks. It does so using a secure hash function and a
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challenge/response system. The opiepasswd(1) program is used to set
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up OPIE authentication for a user. OPIE is enabled by default on
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FreeBSD through PAM.
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II. Problem Description
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The opiepasswd(1) program uses getlogin(2) to identify the user
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calling opiepasswd(1). In some circumstances getlogin(2) will return
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"root" even when running as an unprivileged user. This causes
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opiepasswd(1) to allow an unpriviled user to configure OPIE
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authentication for the root user.
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III. Impact
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In certain cases an attacker able to run commands as a non privileged
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users which have not explicitly logged in, for example CGI scripts run
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by a web server, is able to configure OPIE access for the root user.
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If the attacker is able to authenticate as root using OPIE
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authentication, for example if "PermitRootLogin" is set to "yes" in
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sshd_config or the attacker has access to a local user in the "wheel"
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group, the attacker can gain root privileges.
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IV. Workaround
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Disable OPIE authentication in PAM:
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# sed -i "" -e /opie/s/^/#/ /etc/pam.d/*
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or
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Remove the setuid bit from opiepasswd:
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# chflags noschg /usr/bin/opiepasswd
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# chmod 555 /usr/bin/opiepasswd
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# chflags schg /usr/bin/opiepasswd
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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 4-STABLE, 5-STABLE, or 6-STABLE,
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or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or
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RELENG_4_10 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 4.10,
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4.11, 5.3, 5.4, and 6.0 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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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:12/opie.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:12/opie.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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# cd /usr/src/usr.bin/opiepasswd
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# make obj && make depend && make && make install
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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_4
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src/contrib/opie/opiepasswd.c 1.1.1.2.6.4
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.17
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src/sys/conf/newvers.sh 1.44.2.39.2.20
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src/contrib/opie/opiepasswd.c 1.1.1.2.6.3.10.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.23
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src/sys/conf/newvers.sh 1.33.2.34.2.24
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src/contrib/opie/opiepasswd.c 1.1.1.2.6.3.8.1
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RELENG_5
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src/contrib/opie/opiepasswd.c 1.3.8.1
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RELENG_5_4
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src/UPDATING 1.342.2.24.2.22
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src/sys/conf/newvers.sh 1.62.2.18.2.18
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src/contrib/opie/opiepasswd.c 1.3.12.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.31
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src/sys/conf/newvers.sh 1.62.2.15.2.33
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src/contrib/opie/opiepasswd.c 1.3.10.1
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RELENG_6
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src/contrib/opie/opiepasswd.c 1.3.14.1
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RELENG_6_0
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src/UPDATING 1.416.2.3.2.11
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src/sys/conf/newvers.sh 1.69.2.8.2.7
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src/contrib/opie/opiepasswd.c 1.3.16.1
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1283
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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-06:12.opie.asc
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