轉發 國家資安資訊分享與分析中心 資安訊息警訊 NISAC-200-202610-00000002

[內容說明]
研究人員發現Cisco Secure FMC存在多項高風險安全漏洞(CVE-2026-20242與CVE-2026-20324)，類型分別為不安全之反序列化(Insecure Deserialization)與不當存取控制(ImproperAccess Control)，請儘速確認並進行修補。
【CVE-2026-20242】 當啟用外部資料庫存取(External Database Access)功能，且存取清單中已設定主機時，未經身分鑑別之遠端攻擊者可從清單內之主機向特定TCP連接埠傳送特製之Java序列化位元組串流，進而於受影響裝置以root權限執行任意指令。
【CVE-2026-20324】 當啟用sftunnel通訊協定時(系統預設為啟用)，已通過身分鑑別之遠端攻擊者可藉由劫持sftunnel連線，或冒用合法註冊之sftunnel對端身分傳送指令，將惡意檔案寫入裝置任意位置，並以root權限執行任意程式碼。

[影響平台]
Cisco Secure FMC 7.0.0至7.0.9、7.2.0至7.2.11、7.3.0至7.3.1.2、7.4.0至7.4.7、7.6.0至 7.6.5、7.7.0至7.7.12及10.0.0至10.0.1版本

[建議措施]
官方已針對漏洞釋出修補或更新，請參考官方說明進行處置，網址如下： https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-javarce-y2NypXwk
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-sftunn-codex-c3O4Jft2

[參考資料]
1. https://nvd.nist.gov/vuln/detail/CVE-2026-20242
2. https://nvd.nist.gov/vuln/detail/CVE-2026-20242
3. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-javarce-y2NypXwk
4. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-sftunn-codex-c3O4Jft2
5. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP
Forwarded National Information and Analysis Center for Cyber Security Cybersecurity Information Alert NISAC-200-202610-00000002

[Description]
Researchers have discovered multiple high-risk security vulnerabilities (CVE-2026-20242 and CVE-2026-20324) in Cisco Secure FMC, which are respectively classified as Insecure Deserialization and ImproperAccess Control. Please confirm and apply patches as soon as possible.
【CVE-2026-20242】 When the External Database Access feature is enabled and hosts have been configured in the access list, an unauthenticated remote attacker can send a crafted Java serialized byte stream from a host in the list to a specific TCP port, thereby executing arbitrary commands with root privileges on affected devices.
【CVE-2026-20324】 When the sftunnel protocol is enabled (enabled by default), an authenticated remote attacker can hijack an sftunnel connection or impersonate a legitimately registered sftunnel peer to send commands, write malicious files to arbitrary locations on the device, and execute arbitrary code with root privileges.

[Affected Platforms]
Cisco Secure FMC versions 7.0.0 to 7.0.9, 7.2.0 to 7.2.11, 7.3.0 to 7.3.1.2, 7.4.0 to 7.4.7, 7.6.0 to 7.6.5, 7.7.0 to 7.7.12, and 10.0.0 to 10.0.1

[Recommended Measures]
The vendor has released patches or updates for the vulnerabilities. Please refer to the official instructions for remediation. The URLs are as follows: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-javarce-y2NypXwk
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-sftunn-codex-c3O4Jft2

[References]
1. https://nvd.nist.gov/vuln/detail/CVE-2026-20242
2. https://nvd.nist.gov/vuln/detail/CVE-2026-20242
3. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-javarce-y2NypXwk
4. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-sftunn-codex-c3O4Jft2
5. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP