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)
142 lines
5.8 KiB
Text
142 lines
5.8 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-05:01.telnet Security Advisory
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The FreeBSD Project
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Topic: telnet client buffer overflows
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Category: contrib
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Module: contrib/telnet
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Announced: 2005-03-28
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Credits: iDEFENSE
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Affects: All FreeBSD releases prior to 5.4-RELEASE
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Corrected: 2005-03-28 15:50:00 UTC (RELENG_5, 5.4-PRERELEASE)
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2005-03-28 15:48:00 UTC (RELENG_4, 4.11-STABLE)
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2005-03-28 15:52:00 UTC (RELENG_5_3, 5.3-RELEASE-p6)
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2005-03-28 15:57:00 UTC (RELENG_4_11, 4.11-RELEASE-p1)
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2005-03-28 15:58:00 UTC (RELENG_4_10, 4.10-RELEASE-p6)
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2005-03-28 16:00:00 UTC (RELENG_4_8, 4.8-RELEASE-p28)
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CVE Name: CAN-2005-0468 CAN-2005-0469
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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 telnet(1) command is a TELNET protocol client, used primarily to
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establish terminal sessions across a network.
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II. Problem Description
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Buffer overflows were discovered in the env_opt_add() and
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slc_add_reply() functions of the telnet(1) command. TELNET protocol
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commands, options, and data are copied from the network to a
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fixed-sized buffer. In the case of env_opt_add (CAN-2005-0468), the
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buffer is located on the heap. In the case of slc_add_reply
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(CAN-2005-0469), the buffer is global uninitialized data (BSS).
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III. Impact
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These buffer overflows may be triggered when connecting to a malicious
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server, or by an active attacker in the network path between the
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client and server. Specially crafted TELNET command sequences may
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cause the execution of arbitrary code with the privileges of the user
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invoking telnet(1).
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IV. Workaround
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Do not use telnet(1) to connect to untrusted machines or over an
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untrusted network.
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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 or 5-STABLE, or to the
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RELENG_5_3, RELENG_4_11, RELENG_4_10, or RELENG_4_8 security branch
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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 4.8, 4.10,
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4.11, and 5.3 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 4.x]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:01/telnet4.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:01/telnet4.patch.asc
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[FreeBSD 5.x]
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:01/telnet5.patch
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# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:01/telnet5.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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c) Rebuild the operating system as described in
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<URL:http://www.freebsd.org/doc/handbook/makeworld.html>.
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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/crypto/heimdal/appl/telnet/telnet/telnet.c 1.1.1.1.2.4
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src/crypto/kerberosIV/appl/telnet/telnet/telnet.c 1.1.1.1.2.1
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src/crypto/telnet/telnet/telnet.c 1.4.2.6
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src/usr.bin/telnet/telnet.c 1.8.2.4
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RELENG_4_11
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src/UPDATING 1.73.2.91.2.2
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src/crypto/heimdal/appl/telnet/telnet/telnet.c 1.1.1.1.2.3.10.1
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src/crypto/kerberosIV/appl/telnet/telnet/telnet.c 1.1.1.1.22.1
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src/crypto/telnet/telnet/telnet.c 1.4.2.5.12.1
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src/sys/conf/newvers.sh 1.44.2.39.2.5
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src/usr.bin/telnet/telnet.c 1.8.2.3.12.1
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RELENG_4_10
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src/UPDATING 1.73.2.90.2.7
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src/crypto/heimdal/appl/telnet/telnet/telnet.c 1.1.1.1.2.3.8.1
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src/crypto/kerberosIV/appl/telnet/telnet/telnet.c 1.1.1.1.20.1
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src/crypto/telnet/telnet/telnet.c 1.4.2.5.10.1
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src/sys/conf/newvers.sh 1.44.2.34.2.8
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src/usr.bin/telnet/telnet.c 1.8.2.3.10.1
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RELENG_4_8
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src/UPDATING 1.73.2.80.2.32
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src/crypto/heimdal/appl/telnet/telnet/telnet.c 1.1.1.1.2.3.4.1
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src/crypto/kerberosIV/appl/telnet/telnet/telnet.c 1.1.1.1.16.1
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src/crypto/telnet/telnet/telnet.c 1.4.2.5.6.1
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src/sys/conf/newvers.sh 1.44.2.29.2.29
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src/usr.bin/telnet/telnet.c 1.8.2.3.6.1
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RELENG_5
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src/contrib/telnet/telnet/telnet.c 1.14.6.1
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RELENG_5_3
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src/UPDATING 1.342.2.13.2.9
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src/contrib/telnet/telnet/telnet.c 1.14.8.1
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src/sys/conf/newvers.sh 1.62.2.15.2.11
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- -------------------------------------------------------------------------
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VII. References
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[IDEF0866] Multiple Telnet Client slc_add_reply() Buffer Overflow
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http://www.idefense.com/application/poi/display?id=220&type=vulnerabilities
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[IDEF0867] Multiple Telnet Client env_opt_add() Buffer Overflow
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http://www.idefense.com/application/poi/display?id=221&type=vulnerabilities
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