#VU46207 Path traversal in openSIS - CVE-2020-6142

Vulnerability identifier: #VU46207

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-6142

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
openSIS
Web applications / CMS

Vendor: Open Solutions for Education

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the "Modules.php" functionality. A remote authenticated attacker can send a specially crafted HTTP request and read arbitrary files on the system, leading to remote code execution.

Mitigation
Install update from vendor's website.

Vulnerable software versions

openSIS: 7.0 - 7.3

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External links
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1082

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.