#VU53597 Path traversal in transfer.sh - CVE-2021-33497

Vulnerability identifier: #VU53597

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-33497

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
transfer.sh
Web applications / Modules and components for CMS

Vendor: Dutchcoders

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 delete arbitrary files on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

transfer.sh: 1.0.0 - 1.2.3

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External links
https://vuln.ryotak.me/advisories/44
https://github.com/dutchcoders/transfer.sh/pull/373
https://github.com/dutchcoders/transfer.sh/releases/tag/v1.2.4

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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.