Vulnerability identifier: #VU41778

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-2735

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
WinSCP
Client/Desktop applications / File managers, FTP clients

Vendor: winscp.sourceforge.net

Description

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

WinSCP before 5.5.3, when FTP with TLS is used, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

Mitigation
Install update from vendor's website.

Vulnerable software versions

WinSCP: 5.5 - 5.5.1

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External links
http://winscp.net/eng/docs/history
http://winscp.net/tracker/show_bug.cgi?id=1152
http://www.securityfocus.com/archive/1/531847/100/0/threaded

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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.