Telnet Server Ubuntu 12.04 Downloadl ##BEST##
Obtain the Desktop Edition installation DVD/CD set. Connect to for information. For example you can download an ISO image of the installation CD and then burn your own installation CD. You want the file ubuntu-12.04-desktop-amd64.iso or, if you have a very old server, ubuntu-12.04-desktop-i386.iso. Choose the former to take full advantage of computers based on the AMD64 or EM64T architecture (e.g., Athlon64, Opteron, EM64T Xeon, Core 2). Choose which ever download site works best for you; I have had good luck with -releases/ If you download the ISO image, make sure that you verify the integrity of the downloaded file by comparing the MD5 checksum of the downloaded file with the MD5 checksum listed at or at the download site (e.g. -releases/12.04/MD5SUMS). These instructions will assume you have the ubuntu-12.04.4-desktop-amd64.iso installation CD but installing from the i386, alternate CD, a commercial DVD/CD set or from the net should be essentially identical.
Telnet Server Ubuntu 12.04 Downloadl
At this point you can login your server from a remote location using SSH (non secure telnet and FTP are not allowed but secure SSH and SFTP are). If you are using "SSH Secure Shell" (now called "SSH Tectia"), a popular SSH client for PC's, you will have to add Keyboard Interactive to the list of "Authentication methods" under "Authentication" if it's not already there.
This is also a good time to check that you can login your server from a remote location using SSH if you have not yet done so (non secure telnet and FTP are not allowed but secure SSH and SFTP are). If you are using "SSH Secure Shell" (now called "SSH Tectia"), a popular SSH client for PC's, you will have to add Keyboard Interactive to the list of "Authentication methods" under "Authentication" if it's not already there.
On port 21, Metasploitable2 runs vsftpd, a popular FTP server. This particular version contains a backdoor that was slipped into the source code by an unknown intruder. The backdoor was quickly identified and removed, but not before quite a few people downloaded it. If a username is sent that ends in the sequence :) [ a happy face ], the backdoored version will open a listening shell on port 6200. We can demonstrate this with telnet or use the Metasploit Framework module to automatically exploit it:
Changes since previous release:Aaro Koskinen: find: implement -samefileAlin Mr: ash.c: speedup $s: substring (no quotes)Andrej Valek: mktemp: add --tmpdir optionAriadne Conill: cpio: add support for --ignore-devno like GNU cpio cpio: add support for --renumber-inodes like GNU cpioBernhard Reutner-Fischer: chrt: silence analyzer warning libarchive: remove duplicate forward declarationDaniel Thau: awk: fix printf %%Denys Vlasenko: config system: move some options closer to relevalnt tool subdirectories libbb.h: fix logic selecting incorrect BB_STRTOOFF for !LFS configs libbb/lineedit: do not escape %^=+}]:, escape ? in tab completion libbb: clarify what bb_mode_string() generates libbb: code shrink bb_parse_mode libbb: code shrink in des encryption, in setup_salt() libbb: code shrink in main() and scripted_main() libbb: eliminate a static data array in bb_mode_string() libbb: make bb_lookup_port() abort on bad port names libbb: reuse "bad port" error message string shell/ash_test/run-all: unset locale/language variables shell: do not read user database for every prompt - only for those which need it shell: enable more tests which are passing now shell: fix arithmentic evaluation of "++7" and such (it is + + 7, i.e. 7) shell: fix parsing of $(( (v)++ + NUM )) shell: fix script's comm field if ENABLE_FEATURE_PREFER_APPLETS=y shell: use more compact SHELL_ASH / HUSH config defines. no code changes ash: LINENO starts from 0 in -c SCRIPT mode ash: eval: Check nflag in evaltree instead of cmdloop ash: eval: Do not cache value of eflag in evaltree ash: eval: Prevent recursive PS4 expansion ash: fix LINENO in functions ash: fix compile breakage in !ENABLE_ASH_ALIAS config ash: introduce bash-like $FUNCNAME ash: parser: Fix alias expansion after heredoc or newlines ash: parser: Fix handling of empty aliases ash: parser: Get rid of PEOA ash: parser: Save and restore heredoclist in expandstr ash: speed up $ too, make it independent of ASH_OPTIMIZE_FOR_SIZE ash: support testsuite for !FEATURE_SUID_CONFIG_QUIET configs ash: use pgetc_eatbnl() in more places, take 3 hush: fix set -n to act immediately, not just after run_list() hush: fix var_LINENO3.tests failure hush: speed up $ too awk: code shrink: avoid duplicate NUL checks and strlen() awk: never return NULL from awk_printf() basename: implement -a and -s SUFFIX blkdiscard: accept -f (force) as no-op bzip: make ftab and crc32table member arrays of EState, do not allocate chat: hopefully fix infinite spinning on input EOF chmod: correctly report changed modes df: "support" -H as an alias of -h dhcprelay: change two more variables to unsigned find: code shrink -m,a,ctime,min httpd: do not send Last-Modified / ETag / Content-Length for error pages httpd: fix config deps httpd: if range is not specified, correctly fall back to read/write loop httpd: fix compile failure if !FEATURE_HTTPD_RANGES mount: "mount -o rw ...." should not fall back to RO mount mount: with -w, do not fall back to read-only mounts ps: fix -o pid=PID,args interpreting entire "PID,args" as header resize: use tcgetattr(TCSAFLUSH) instead of TCSANOW, closes 13811 shuf: in -i RANGE, accept numbers up to width of pointers shuf: make -i 99999999990-100000000000 work even on 32 bits shuf: with -i LOW-HIGH, do not allow any argv's tar,smemcap: commonalyze checksumming code for tar header tar: prevent malicious archives with enormous long name sizes OOMing the machine tls: "server cert is not RSA" is a fatal error tls: replace "26-bit" P256 code with 32-bit one tls: x25519: code shrink by factoring out common code udhcp: fix build breakage on MIPS udhcpc6: fix udhcp_find_option to actually find DHCP6 options udhcpd: check config file for bad IP ranges (start > end) uudecode: special-case "/dev/stdout", closes 14241 xxd: fix -p -r, closes 13881Dominique Martinet: sed: do not ignore 'g' modifier when match starts with ^Ildar Shaimordanov: wget: allow end-users to customize Content-Type for --post-data and --post-fileIsmael Luceno: less: Ignore -X config: find: Fix mtime/mmin description find: Unify time comparisons find: implement -amin, -atime, -cmin, and -ctimeMartin Kaiser: Makefile.flags: use all cflags for crypt and rt checksMatthew Slowe: timeout: add support for "timeout -k KILL_SECS"Nicholas Niro: ip: added support for setting netns on devicesPeter Korsgaard: libarchive/get_header_ar.c: fix extraction of archives from binutils in deterministic modeRoberto A. Foglietta: ash: add bash-like ERR trap and set -ERon Yorston: libbb: better coreutils compatibility for realpath libbb: code shrink parse_datestr libbb: ensure mode_string is NUL terminated ash: fix ignoreeof option ash: let ignoreeof only affect interactive shells ash: regressions in process substitution ash: stopped jobs should only prevent exit from interactive shell awk: fix read beyond end of buffer cal: implement -m date,touch: allow timezone offsets in dates getopt: code shrink printf: allow 0 as a flag and allow multiple flags rev: correct output for long input lines shuf: speed-up when limited output is requested tar,smemcap: silence compiler warning vi: changes to handling of -c and EXINIT vi: code shrink print_literal() vi: don't right shift empty lines vi: further changes to colon addresses vi: searches in colon commands should wrap vi: support /.exrc wget: implement --post-fileSergey Ponomarev: httpd,telnetd: make default port configurableSören Tempel: ed: align output of read/write commands with POSIX-1.2008 ed: add support for -p command-line option as mandated by POSIX ed: fix current line number for file passed via the command-line ed: align output of read command with POSIX.1-2008Walter Lozano: cmp: add support for -nYU Jincheng: *: generalize "const trick" Make const ptr assign as function call in clang
Changes since previous release:Alex Samorukov: Do not add -lresolv on non-Linux systems Fix bb_setpgrp weapper on the FreeBSD Fix httpd compilation on the FreeBSD Fix klogd applet compilation on the FreeBSD Fix missing "crypt.h" compilation error on the FreeBSD Fix mknod compilation on the FreeBSD Fix ntpd compilcation on the FreeBSD Fix ping build on the FreeBSD Fix traceroute applet on the FreeBSD Fix mail compilation on the FreeBSD Fix for the FEATURE_UTMP on the FreeBSDAlexander Sack: httpd: cgi-bin support for DELETE, PUT, OPTIONS etc methodsAlison Winters: vi: restore 0 offset after :set noXXX command vi: allow writing to another file if this one is readonlyAndre Kalb: udhcpc: Add support to change default interface nameBernd Kuhls: update_passwd: fix context variableChris Renshaw: gcc-version.sh: fix for "invalid number" message during Android NDK buildsDenys Vlasenko: Makefile.flags: add a test for -lrt availability gcc-version.sh: Cygwin fix trylink: do not drop libs from CONFIG_EXTRA_LDLIBS platform.h: fix for Bionic >= 21 not having wait3() libbb.h: inline byteswaps libbb/procps: smaller global data for username/groupname cache libbb: correct the name of is_TERM_dumb() libbb: do not check closedir() in remove_file() libbb: fix '--help' handling in FEATURE_SH_NOFORK=y libbb: introduce and use xgettimeofday(), do not truncate 64-bit time_t in shells decompress_gunzip: simplify ERR_RET bit clearing e2fsprogs/*: remove ioctl calling obfuscation move iterate_on_dir() from e2fsprogs to libbb tls: implement secp256r1 elliptic curve (aka P256) tls: "server did not provide EC key" is fatal tls: get rid of constant-time add/sub operations tls: make constant basepoint9 array 8-byte aligned tls: make x25519 key generation code more similar to P256 tls: reduce register pressure in i386 assembly (helps Android to compile) ascii: new applet