Input validation error in SimpleSAMLphp

1) Input validation error

EUVDB-ID: #VU37570

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-6521

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The sqlauth module in SimpleSAMLphp before 1.15.2 relies on the MySQL utf8 charset, which truncates queries upon encountering four-byte characters. There might be a scenario in which this allows remote attackers to bypass intended access restrictions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SimpleSAMLphp: 1.15.0 - 1.15.1

CPE2.3

• cpe:2.3:a:simplesamlphp:simplesamlphp:1.15.0:*:*:*:*:*:*:*
• cpe:2.3:a:simplesamlphp:simplesamlphp:1.15.1:*:*:*:*:*:*:*

External links

https://lists.debian.org/debian-lts-announce/2018/02/msg00008.html
https://simplesamlphp.org/security/201801-03
https://www.debian.org/security/2018/dsa-4127

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.