{"id":75980,"date":"2025-09-18T19:55:10","date_gmt":"2025-09-18T19:55:10","guid":{"rendered":""},"modified":"2025-09-28T15:47:07","modified_gmt":"2025-09-28T21:47:07","slug":"cve-2025-8699-exploitation-of-stored-value-nfc-cards-vulnerability-in-kiosoft-payment-solutions","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-8699-exploitation-of-stored-value-nfc-cards-vulnerability-in-kiosoft-payment-solutions\/","title":{"rendered":"<strong>CVE-2025-8699: Exploitation of &#8220;Stored Value&#8221; NFC Cards Vulnerability in KioSoft Payment Solutions<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>This blog post delves into the CVE-2025-8699 vulnerability identified in certain &#8220;Stored Value&#8221; Unattended Payment Solutions offered by KioSoft. This vulnerability stands out due to the potential abuse of NFC (Near Field Communication) cards&#8217; insecure storage of account balances, potentially allowing attackers to manipulate these balances to their advantage. Given the ubiquity of NFC cards in modern payment systems, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58059-critical-vulnerability-in-valtimo-s-business-process-automation-platform\/\"  data-wpil-monitor-id=\"86230\">vulnerability could have far-reaching implications for individuals and businesses<\/a> alike.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-8699<br \/>\nSeverity: Critical (9.1 CVSS Score)<br \/>\nAttack Vector: Physical<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9791-critical-vulnerability-in-tenda-ac20-16-03-08-05-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"84999\">Potential System<\/a> Compromise and Data Leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-4014463746\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>KioSoft Unattended Payment Solutions | All versions using insecure MiFare Classic NFC cards<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by manipulating the data stored on the NFC card. The NFC card used in these KioSoft solutions is a MiFare Classic card, which has a known <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8067-udisks-daemon-vulnerability-leading-to-potential-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"85742\">vulnerability where the stored data<\/a> can be read and written back. By observing changes in card dumps, an attacker can identify the fields storing the cash value and a checksum. The checksum is created by XOR-ing the cash value with an unknown field and a certain value. Once these fields are identified, the attacker can update them to load arbitrary amounts of money onto the card, up to $655.35.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3828682805\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Given the physical nature of this exploit, traditional example <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-57771-arbitrary-command-execution-vulnerability-in-roo-code-ai\/\"  data-wpil-monitor-id=\"84859\">code like HTTP requests or shell commands<\/a> won&#8217;t be applicable. Instead, let&#8217;s provide a simplified pseudocode representation of the process:<\/p>\n<pre><code class=\"\" data-line=\"\">card_data = ReadNFCData(card)\ncash_value_field = IdentifyCashValueField(card_data)\nchecksum_field = IdentifyChecksumField(card_data)\nnew_cash_value = ArbitraryValue(up to $655.35)\nupdated_card_data = UpdateCardData(card_data, cash_value_field, new_cash_value)\nupdated_checksum = CalculateChecksum(updated_card_data, checksum_field)\nWriteNFCData(card, updated_card_data, updated_checksum)<\/code><\/pre>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users are recommended to apply the vendor patch once it becomes available. Until then, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as a temporary mitigation. These <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27215-unauthorized-system-modification-vulnerability-in-unifi-display-cast-devices\/\"  data-wpil-monitor-id=\"84894\">systems can help identify and block attempts to exploit vulnerabilities<\/a>, providing an additional layer of security in the interim.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview This blog post delves into the CVE-2025-8699 vulnerability identified in certain &#8220;Stored Value&#8221; Unattended Payment Solutions offered by KioSoft. This vulnerability stands out due to the potential abuse of NFC (Near Field Communication) cards&#8217; insecure storage of account balances, potentially allowing attackers to manipulate these balances to their advantage. Given the ubiquity of NFC [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-75980","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=75980"}],"version-history":[{"count":5,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75980\/revisions"}],"predecessor-version":[{"id":79026,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75980\/revisions\/79026"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=75980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=75980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=75980"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=75980"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=75980"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=75980"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=75980"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=75980"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=75980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}