FreeRDP NTLM Authentication Module Out-Of-Bounds Read Denial of Service Vulnerability [CVE-2018-8789]

CVE number – CVE-2018-8789

A vulnerability in the NT LAN Manager (NTLM) authentication module of FreeRDP could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.The vulnerability is due to several out-of-bound read conditions that exist in the NTLM authentication module of the affected software. An attacker could exploit this vulnerability by sending a request that submits malicious input to the targeted system. A successful exploit could trigger several out-of-bounds read conditions that the attacker could use to cause a DoS condition.FreeRDP has confirmed the vulnerability and released software updates.

Analysis

  • To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement could reduce the likelihood of a successful exploit.

Safeguards

  • Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

Fixed Software

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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