#VU75215 Path traversal in Flask-CORS - CVE-2020-25032

Vulnerability identifier: #VU75215

Vulnerability risk: Medium

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

CVE-ID: CVE-2020-25032

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Flask-CORS
Universal components / Libraries / Libraries used by multiple products

Vendor: Cory Dolphin

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. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Flask-CORS: 1.1 - 3.0.8

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External links
https://github.com/corydolphin/flask-cors/releases/tag/3.0.9
https://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.html
https://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.html
https://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.html
https://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.html
https://www.debian.org/security/2020/dsa-4775

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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.