A Vulnerability in SolarWinds Serv-U Could Allow for Remote Code Execution

ITS Advisory Number: 
2021-086
Date(s) Issued: 
Tuesday, July 13, 2021
Subject: 
A Vulnerability in SolarWinds Serv-U Could Allow for Remote Code Execution
Overview: 

A vulnerability has been discovered in SolarWinds Serv-U, which could result in remote code execution. SolarWinds Serv-U is an FTP server software for secure file transfer. Successful exploitation of this vulnerability could allow for remote code execution within the context of a privileged process. Depending on the privileges associated with this application, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If this application has been configured to have fewer user rights on the system, exploitation of this vulnerability could have less impact than if it was configured with administrative rights.

 

THREAT INTELLIGENCE:

Microsoft has provided evidence of limited, targeted customer impact, though SolarWinds does not currently have an estimate of how many customers may be directly affected by the vulnerability.

 

Systems Affected: 
  • SolarWinds Serv-U versions prior to Serv-U 15.2.3 HF2
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
Low
Description: 

A vulnerability has been discovered in SolarWinds Serv-U, which could result in remote code execution. SolarWinds Serv-U is prone to a remote memory escape vulnerability that could allow a threat actor to run arbitrary code within the context of a privileged process. Depending on the privileges associated with this application, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If this application has been configured to have fewer user rights on the system, exploitation of this vulnerability could have less impact than if it was configured with administrative rights.

 

Actions: 
  • After appropriate testing, immediately apply appropriate updates provided by SolarWinds to vulnerable systems.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
  • Apply the Principle of Least Privilege to all systems and services.