#VU37570 Input validation error in SimpleSAMLphp - CVE-2018-6521

Vulnerability identifier: #VU37570

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SimpleSAMLphp
Web applications / Other software

Vendor: SimpleSAMLphp

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

---

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.