Jenkins Token Macro Plug-In XML External Entities Vulnerability [CVE-2019-10337]

CVE Number – CVE-2019-10337

A vulnerability in the Jenkins Token Macro plug-in could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.The vulnerability exists because the affected software performs insufficient validation of user-supplied data while resolving XML external entities (XXEs). An attacker could exploit this vulnerability by submitting a crafted XML file to the targeted system. A successful exploit could allow the attacker to cause a DoS condition on the system. Jenkins has confirmed the vulnerability and released software updates.

Analysis

• To exploit this vulnerability, the attacker must send a crafted XML file 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

• Jenkins has released a security advisory at the following link: SECURITY-1399

Fixed Software

• Jenkins has released software updates at the following link: Jenkins Token Macro Plugin 2.8