Phusion Passenger up to 5.3.1 SpawningKit access control

Summaryinfo

A vulnerability described as problematic has been identified in Phusion Passenger up to 5.3.1. The affected element is an unknown function of the component SpawningKit. Such manipulation leads to access control. This vulnerability is uniquely identified as CVE-2018-12027. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Phusion Passenger up to 5.3.1 and classified as problematic. Affected by this issue is an unknown code block of the component SpawningKit. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality. CVE summarizes:

An Insecure Permissions vulnerability in SpawningKit in Phusion Passenger 5.3.x before 5.3.2 causes information disclosure in the following situation: given a Passenger-spawned application process that reports that it listens on a certain Unix domain socket, if any of the parent directories of said socket are writable by a normal user that is not the application's user, then that non-application user can swap that directory with something else, resulting in traffic being redirected to a non-application user's process through an alternative Unix domain socket.

The bug was discovered 06/13/2018. The weakness was disclosed 06/17/2018 (Website). The advisory is available at blog.phusion.nl. This vulnerability is handled as CVE-2018-12027 since 06/07/2018. The exploitation is known to be easy. The attack may be launched remotely. The requirement for exploitation is a simple authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111225 (GLSA-201807-02 : Passenger: Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l.

Upgrading to version 5.3.2 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111225). The entries VDB-119641, VDB-119643 and VDB-119644 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Phusion

Name

• Passenger

Version

• 5.3.0
• 5.3.1

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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