Apache Hadoop yarn User Escalation Arbitrary Root Command Execution Vulnerability [CVE-2018-11766]

CVE Number CVE-2018-11766

A vulnerability in Apache Hadoop could allow an authenticated, remote attacker to execute arbitrary commands with elevated privileges on a targeted system.The vulnerability is due to improper security restrictions that are imposed by the affected software. An attacker who can escalate to yarn user access could exploit this vulnerability to execute arbitrary commands with root privileges on a targeted system. A successful exploit could result in a complete system compromise.Apache has confirmed the vulnerability and released software updates.


  • To exploit this vulnerability, the attacker must authenticate to and obtain yarn user access to the targeted system. These requirements may reduce the likelihood of a successful exploit.


  • 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.

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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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