#VU6127 Directory traversal in OpenSSH

Vulnerability identifier: #VU6127

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor: OpenSSH

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists in sftp-client in portable version of OpenSSH when processing file names. A remote attacker can trick the victim to connect to a malicious SFTP server and perform operations on files with specially crafted file names, containing directory traversal sequences (e.g. ../../).

Successful exploitation of the vulnerability may allow an attacker to overwrite arbitrary files on the victim’s system.

Mitigation
Update to version 7.5.

Vulnerable software versions

OpenSSH: 7.0p1 - 7.4p1

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External links
https://www.openssh.com/txt/release-7.5

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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.