A vulnerability in the phar stream wrapper interceptor of Drupal could allow an authenticated, remote attacker to conduct a path traversal attack on a targeted system.
The vulnerability exists because the affected software does not properly impose security restrictions. An attacker with administrative privileges could exploit this vulnerability to conduct a path traversal attack on the targeted system. A successful exploit could allow the attacker to bypass a deserialization protection mechanism and then conduct further attacks.
Drupal has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must have the privileges to
perform administrative actions on the targeted system. This access
requirement could 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.
Drupal.org has released a security advisory at the following link: SA-CORE-2019-007
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.