Input validation error in Phusion Passenger

1) Input validation error

EUVDB-ID: #VU40538

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-7519

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

agent/Core/Controller/SendRequest.cpp in Phusion Passenger before 4.0.60 and 5.0.x before 5.0.22, when used in Apache integration mode or in standalone mode without a filtering proxy, allows remote attackers to spoof headers passed to applications by using an _ (underscore) character instead of a - (dash) character in an HTTP header, as demonstrated by an X_User header.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Phusion Passenger: 5.0.0 - 5.0.21

CPE2.3

• cpe:2.3:a:phusion_b_v:phusion_passenger:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:phusion_b_v:phusion_passenger:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:phusion_b_v:phusion_passenger:5.0.2:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-security-announce/2015-12/msg00024.html
https://www.openwall.com/lists/oss-security/2015/12/07/1
https://www.openwall.com/lists/oss-security/2015/12/07/2
https://blog.phusion.nl/2015/12/07/cve-2015-7519/
https://bugzilla.suse.com/show_bug.cgi?id=956281
https://github.com/phusion/passenger/commit/ddb8ecc4ebf260e4967f57f271d4f5761abeac3e
https://lists.debian.org/debian-lts-announce/2018/06/msg00007.html
https://puppet.com/security/cve/passenger-dec-2015-security-fixes

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.