#VU38372 Input validation error in Debian Linux - CVE-2017-12869

Vulnerability identifier: #VU38372

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-12869

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Debian Linux
Operating systems & Components / Operating system

Vendor: Debian

Description

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

The multiauth module in SimpleSAMLphp 1.14.13 and earlier allows remote attackers to bypass authentication context restrictions and use an authentication source defined in config/authsources.php via vectors related to improper validation of user input.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 7.0 - 9.0

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External links
https://lists.debian.org/debian-lts-announce/2017/12/msg00007.html
https://simplesamlphp.org/security/201704-02
https://www.debian.org/security/2018/dsa-4127

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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.