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Kaspersky Lab Advisory

(KL-SOPHOS-2018-003) Remote Code Execution

Affected Software

Software version: Sophos XG Firewall versions 17.0, 17.1, 16.5 OEM, 16 and older.

Severity level

  • Impact: An attacker is able to execute arbitrary system commands as a result of exploiting this vulnerability.
  • Access Vector: Remote
  • CVSS v3 Vector: AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
  • Overall CVSS Score: 9.0
  • CVE: CVE-2018-16118
  • CWE Type: CWE-78

Software description

Sohos XG Firewall is a software firewall and network access control appliance.

Vulnerability description

Shell escape vulnerability is present in /webconsole/APIController URL in HTTP header X-Forwarded-for. Inserting backticks in HTTP header X-Forwarded-for enables an attacker to execute arbitrary shell commands with root privileges. Exploitation requires the API Configuration feature of the firewall to be enabled and made. accessible.

Mitigation

Vendor has released a patch for the vulnerability- https://community.sophos.com/kb/en-us/132637

Credits

The weakness was discovered by specialists from Kaspersky Lab.