Input validation error in SimpleSAMLphp

1) Input validation error

EUVDB-ID: #VU31447

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9955

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local non-authenticated attacker to #BASIC_IMPACT#.

The SimpleSAML_XML_Validator class constructor in SimpleSAMLphp before 1.14.11 might allow remote attackers to spoof signatures on SAML 1 responses or possibly cause a denial of service (memory consumption) by leveraging improper conversion of return values to boolean.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SimpleSAMLphp: 1.14.0 - 1.14.10

External links

http://www.securityfocus.com/bid/94946
http://lists.debian.org/debian-lts-announce/2018/03/msg00001.html
http://simplesamlphp.org/security/201612-02

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.