Browser Blocker - Reflected cross-site scripting (XSS)

4,8

Medium

Detected by

Fluid Attacks SAST Scanner

Disclosed by

Andres Roldan

Offensive Team, Fluid Attacks

Summary

Full name

Browser Blocker 0.5. - Reflected cross-site scripting (XSS)

Code name

State

Private

Release date

14 mar 2025

Affected product

Browser Blocker

Affected version(s)

Version 0.5.

Vulnerability name

Reflected cross-site scripting (XSS)

Remotely exploitable

No

CVSS v4.0 vector string

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L/E:U

CVSS v4.0 base score

4.8

Exploit available

No

Description

Browser Blocker 0.5. was found to be vulnerable. The web application dynamically generates web content without validating the source of the potentially untrusted data in myapp/browser_blocker.php.

Vulnerability

Skims by Fluid Attacks discovered a Reflected cross-site scripting (XSS) in Browser Blocker 0.5.. The following is the output of the tool:

Skims output

 351 | function BrowserBlocker_Options_Page() {
 352 | global $wpdb;
 353 | $wpdb->show_errors();
 354 | $siteurl = get_option('siteurl');
 355 | $plugin_url = $siteurl . '/wp-content/plugins/' . basename(dirname(__FILE__));
 356 | $img_url = $plugin_url . '/images/';
 357 |
 358 | BB_STYLE();
 359 |
 360 | if (isset($_POST['bb_update']) === true) {
 361 |
 362 | if(isset($_POST[""clear""])){
 363 | update_option('Browser_Blocker_Enabled', '0');
 364 | update_option('Browser_Blocker_Credit', '1');
 365 | update_option('Browser_Blocker_Title', '');
 366 | update_option('Browser_Blocker_Msg', '');
 367 | update_option('Browser_Blocker_Splash_Img', '');
 368 | update_option('Browser_Blocker_Blocked', '');
 369 | update_option('Browser_Blocker_Display_Browsers', '1~2~3~5~');
 370 | update_option('Browser_Blocker_Bypass', '0');
 371 | update_option('Browser_Blocker_BPtext', '');
 372 | update_option('Browser_Blocker_Code', '');
 373 |
 374 | $successmessage = ""Browser Blocker Options Cleared Out Successfully"";
 375 | }else{
 376 | $errors=0;
 377 |
 378 | if($_POST['bb_update'] == ""advanced""){
 379 |
 380 | if(get_option('Browser_Blocker_Splash_Img') != $_POST['bb_splash_img']){
 381 | if($_POST['bb_splash_img'] != """"){
 382 | if(!update_option('Browser_Blocker_Splash_Img', $_POST['bb_splash_img'])){
 383 | $errors++;
 384 | }
 385 | }else{
 386 | update_option('Browser_Blocker_Splash_Img', $_POST['bb_splash_img']);
 387 | }
 388 | }
 389 |
 390 | if(get_option('Browser_Blocker_Title') != $_POST['bb_text']){
 391 | if($_POST['bb_text'] != """"){
 392 | if(!update_option('Browser_Blocker_Title', $_POST['bb_text'])){
 393 | $errors++;
 394 | }
 395 | }else{
 396 | update_option('Browser_Blocker_Title', $_POST['bb_text']);
 397 | }
 398 | }
 399 |
 400 | if(get_option('Browser_Blocker_Msg') != $_POST['bb_msg']){
 401 | if($_POST['bb_msg'] != """"){
 402 | if(!update_option('Browser_Blocker_Msg', $_POST['bb_msg'])){
 403 | $errors++;
 404 | }
 405 | }else{
 406 | update_option('Browser_Blocker_Msg', $_POST['bb_msg']);
 407 | }
 408 | }
 409 |
 410 | if(get_option('Browser_Blocker_Code') != $_POST['bb_code']){
 411 | if($_POST['bb_code'] != """"){
 412 | if(!update_option('Browser_Blocker_Code', $_POST['bb_code'])){
 413 | $errors++;
 414 | }
 415 | }else{
 416 | update_option('Browser_Blocker_Code', $_POST['bb_code']);
 417 | }
 418 | }
 419 |
 420 | $downloads = get_option('Browser_Blocker_Display_Browsers');
 421 | $browsers = """";
 422 | for($x=1; $x <= 5; $x++){
 423 | $browserd = ""browser_"".$x;
 424 | if(isset($_POST[$browserd])){
 425 | $browsers .= $x.""~"";
 426 | }
 427 | }
 428 | update_option('Browser_Blocker_Display_Browsers', $browsers);
 429 |
 430 | if(isset($_POST['bb_desctext'])){
 431 | $desctext = 1;
 432 | }else{
 433 | $desctext = 0;
 434 | }
 435 |
 436 | if(get_option('Browser_Blocker_DwnldDesc') != $desctext){
 437 | if(!update_option('Browser_Blocker_DwnldDesc', $desctext)){
 438 | $errors++;
 439 | }
 440 | }
 441 |
 442 | if(isset($_POST['bb_bypass'])){
 443 | $bypass = 1;
 444 | }else{
 445 | $bypass = 0;
 446 | }
 447 |
 448 | if(get_option('Browser_Blocker_Bypass') != $bypass){
 449 | if(!update_option('Browser_Blocker_Bypass', $bypass)){
 450 | $errors++;
 451 | }
 452 | }
 453 |
 454 | if(get_option('Browser_Blocker_BPtext') != $_POST['bb_bypass_text']){
 455 | if($_POST['bb_bypass_text'] != """"){
 456 | if(!update_option('Browser_Blocker_BPtext', $_POST['bb_bypass_text'])){
 457 | $errors++;
 458 | }
 459 | }else{
 460 | update_option('Browser_Blocker_BPtext', $_POST['bb_bypass_text']);
 461 | }
 462 | }
 463 |
 464 | if(isset($_POST['bb_pages'])){
 465 | if($_POST['bb_pages'] != get_option('Browser_Blocker_Pages')){
 466 | if(!update_option('Browser_Blocker_Pages', $_POST['bb_pages'])){
 467 | $errors++;
 468 | }
 469 | }
 470 | }
 471 | }
 472 |
 473 | if(get_option('Browser_Blocker_Enabled') != $_POST['bb_enable']){
 474 | if(!update_option('Browser_Blocker_Enabled', $_POST['bb_enable'])){
 475 | $errors++;
 476 | }
 477 | }
 478 |
 479 | if(isset($_POST['bb_attribute'])){
 480 | $attribute = 1;
 481 | }else{
 482 | $attribute = 0;
 483 | }
 484 |
 485 | if(get_option('Browser_Blocker_Credit') != $attribute){
 486 | if(!update_option('Browser_Blocker_Credit', $attribute)){
 487 | $errors++;
 488 | }
 489 | }
 490 |
 491 | $blocked = """";
 492 | for($x=0; $x < $_POST[""bb_versions_detail""]; $x++){
 493 | if($x > 0){ $blocked .= ""~""; }
 494 | $browser = ""bb_browser_"".$x;
 495 | $direction = ""bb_direction_"".$x;
 496 | $version = ""bb_version_"".$x;
 497 | if(isset($_POST[$browser])){
 498 | $blocked .= ""browser_"".$x."":"".$_POST[$browser].""~direction_"".$x."":"".$_POST[$direction].""~version_"".$x."":"".$_POST[$ver
 499 | }
 500 |
 501 | }
 502 | //echo $blocked;
 503 |
 504 | if(get_option('Browser_Blocker_Blocked') != $blocked){
 505 | if(!update_option('Browser_Blocker_Blocked', $blocked)){
 506 | $errors++;
 507 | }
 508 | }
 509 |
 510 | if($errors == 0){
 511 | $successmessage = ""Browser Blocker Options Updated Successfully"";
 512 | }else{
 513 | $errormessage = ""An Error Occurred While Updating Browser Blocker Options"";
 514 | }
 515 | }
 516 |
 517 | }
 518 |
 519 | //$bb_options = BrowserBlocker_GetOptions();
 520 | ?>
 521 |
 522 | <script type=""text/javascript"">
 523 |
 524 | jQuery(document).ready(function($) {
 525 | $("".fade"").delay(4000).slideUp(1000);
 526 |
 527 | //add rows for new detail options
 528 | $(""#bb_add_browser"").click(function(){
 529 |
 530 | $(""#bb_versions"").removeClass(""hidden"").addClass(""visible"");
 531 | var rows = $(""#bb_versions_detail"").val();
 532 | var browser = $(""#bb_blocked"").val();
 533 | var direction = $(""#bb_direction"").val();
 534 | var version = $(""#bb_blocked_ver"").val();
 535 | var rowid = ""#row"" + rows;
 536 | var new_row = ""<tr id='row"" + rows + ""'><td class='first'><input type='hidden' name='bb_browser_"" + rows + ""' id='bb
 537 | $(""#bb_versions"").append(new_row);
 538 | if(rows2 != 0){
 539 | $(rowid).addClass(""odd"");
 540 |
 541 | }
 542 | $(""#bb_versions_detail"").val(++rows);
 543 |
 544 | });
 545 |
 546 | //remove rows
 547 | $("".removeRow"").live('click', function(){
 548 | var rowid = $(this).closest(""tr"").attr(""id"");
 549 | //alert(rowid);
 550 | var agree = confirm('Are you sure you want to remove this detail row?
This action cannot be undone!');
 551 | if(agree){
 552 | $(""#"" + rowid).remove();
 553 | $(""#bb_versions_detail"").val($(""#bb_versions_detail"").val()-1);
 554 | }else{
 555 | return false;
 556 | }
 557 | });
 558 |
 559 | });
 560 | </script>
 561 |
 562 | <div class=""wrap"">
 563 | <div id=""icon-bb""></div><h2>Browser Blocker Admin Options</h2>
 564 | <?php
 565 | if(isset($successmessage)){
 566 | echo '<div id=""message"" class=""updated fade"">
 567 | <p>
 568 | <strong>
 569 | ' . $successmessage . '
 570 | </strong>
 571 | </p>
 572 | </div>';
 573 | }
 574 |
 575 | if(isset($errormessage)){
 576 | echo '<div id=""message"" class=""error"">
 577 | <p>
 578 | <strong>
 579 | ' . $errormessage . '
 580 | </strong>
 581 | </p>
 582 | </div>';
 583 | }
 584 | ?>
 585 |
 586 | <input type=""hidden"" name=""action"" value=""edit"" />
 587 | <div id=""poststuff"" class=""ui-sortable"">
 588 | <div id=""bb_ids_box"" class=""postbox if-js-open"">
 589 | <h3>Browser Blocker Admin Options</h3>
 590 |
> 591 | <a href=""?page=<?php echo $_GET[""page""] ?>&whichP=simple""><div id=""bb_simple"" class=""tab <?php if(!isset($_GET[""whichP
 592 | <div id=""bb_tabbed"">
 593 |
 594 | <?
 595 | if(isset($_GET[""whichP""]) && $_GET[""whichP""] == ""advanced""){
 596 | require_once('advanced.php');
 597 | }else{
 598 | require_once('simple.php');
 599 | }
 600 | ?>
 601 |
 602 | </div>
 603 |
 604 | </div>
 605 | </div>
 606 |
 607 | </div>
 608 | </div>
  609 | <?php
  610 | }
      ^ Col 0

Our security policy

We have reserved the ID CVE-2025-31299 to refer to this issue from now on. Disclosure policy

System Information

  • Product: Browser Blocker

  • Version: 0.5.

Mitigation

There is currently no patch available for this vulnerability.

Timeline

IA generativa

14 mar 2025

Vendor contacted

14 mar 2025

Inicia tu prueba gratuita de 21 días

Descubre los beneficios de nuestra solución Hacking Continuo, de la que ya disfrutan empresas de todos los tamaños.

Inicia tu prueba gratuita de 21 días

Descubre los beneficios de nuestra solución Hacking Continuo, de la que ya disfrutan empresas de todos los tamaños.

Inicia tu prueba gratuita de 21 días

Descubre los beneficios de nuestra solución Hacking Continuo, de la que ya disfrutan empresas de todos los tamaños.

Las soluciones de Fluid Attacks permiten a las organizaciones identificar, priorizar y remediar vulnerabilidades en su software a lo largo del SDLC. Con el apoyo de la IA, herramientas automatizadas y pentesters, Fluid Attacks acelera la mitigación de la exposición al riesgo de las empresas y fortalece su postura de ciberseguridad.

SOC 2 Type II

SOC 3

Suscríbete a nuestro boletín

Mantente al día sobre nuestros próximos eventos y los últimos blog posts, advisories y otros recursos interesantes.

Las soluciones de Fluid Attacks permiten a las organizaciones identificar, priorizar y remediar vulnerabilidades en su software a lo largo del SDLC. Con el apoyo de la IA, herramientas automatizadas y pentesters, Fluid Attacks acelera la mitigación de la exposición al riesgo de las empresas y fortalece su postura de ciberseguridad.

SOC 2 Type II

SOC 3

Suscríbete a nuestro boletín

Mantente al día sobre nuestros próximos eventos y los últimos blog posts, advisories y otros recursos interesantes.

Las soluciones de Fluid Attacks permiten a las organizaciones identificar, priorizar y remediar vulnerabilidades en su software a lo largo del SDLC. Con el apoyo de la IA, herramientas automatizadas y pentesters, Fluid Attacks acelera la mitigación de la exposición al riesgo de las empresas y fortalece su postura de ciberseguridad.

SOC 2 Type II

SOC 3

Suscríbete a nuestro boletín

Mantente al día sobre nuestros próximos eventos y los últimos blog posts, advisories y otros recursos interesantes.