Information disclosure in Phusion Passenger



| Updated: 2019-03-25
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-16355
CWE-ID CWE-61
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Phusion Passenger
Server applications / Application servers

Vendor Phusion B.V.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) UNIX symbolic link following

EUVDB-ID: #VU18066

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2017-16355

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a symlink following issue within the agent/Core/SpawningKit/Spawner.h file. A local user can create a specially crafted symbolic link from the REVISION file to an arbitrary file on the system and view contest of arbitrary file through "passenger-status --show=xml" command.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Phusion Passenger: 5.1.0 - 5.1.9

CPE2.3 External links

https://blog.phusion.nl/2017/10/13/passenger-security-advisory-5-1-11/
https://github.com/phusion/passenger/commit/4043718264095cde6623c2cbe8c644541036d7bf
https://seclists.org/bugtraq/2019/Mar/34
https://www.debian.org/security/2019/dsa-4415


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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