Quantum Secular Labs / Blog / Advisories

CVE-2018-6152: Google Chrome: Unrestricted Upload of File with Dangerous Type

CVE-2018-6152 is rated critical with a CVSS v3.0 base score of 9.6 and affects Google Chrome, along with 4 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

The implementation of the Page.downloadBehavior backend unconditionally marked downloaded files as safe, regardless of file type in Google Chrome prior to 66.0.3359.117 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted HTML page and user interaction.

Severity breakdown

CVSS v3.0 9.6: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
Attack complexity: Low. No special conditions; the attack can be repeated reliably.
Privileges required: None. No account or prior access is needed.
User interaction: Required. A user must take an action, such as opening a file or following a link.
Scope: Changed. Impact reaches beyond the vulnerable component to other resources.
Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-434: Unrestricted Upload of File with Dangerous Type

The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

Affected products

Google Chrome: before 66.0.3359.106
Red Hat Enterprise Linux Desktop: 6.0
Red Hat Enterprise Linux Server: 6.0
Red Hat Enterprise Linux Workstation: 6.0
Debian Linux: 9.0