SB2019011607 - Multiple vulnerabilities in Drupal

Description

This security bulletin contains information about 2 vulnerabilities.

1) Security restrictions bypass (CVE-ID: CVE-2019-6338)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote authenticated attacker to bypass security restrictions on the system.

The vulnerability exists in the Drupal core PEAR Archive_Tar library due to an unsafe object deserialization condition. A remote attacker can submit a specially crafted tar file to bypass security restrictions on the system and conduct further attacks.

2) Input validation error (CVE-ID: CVE-2019-6339)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists in PHP's built-in phar stream wrapper when performing file operations on an untrusted phar:// URI. Some Drupal code (core, contrib, and custom) due to insufficient validation of user-supplied input. A remote attacker can submit specially crafted input and execute arbitrary PHP code.

Remediation

Install update from vendor's website.

References

• https://www.drupal.org/sa-core-2019-001
• https://www.drupal.org/sa-core-2019-002