Input validation error in winscp.sourceforge.net WinSCP



Published: 2019-01-10 | Updated: 2019-01-11
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-20684
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		WinSCP
Client/Desktop applications / File managers, FTP clients

Vendor winscp.sourceforge.net

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU16945

Risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-20684

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists in TSCPFileSystem::SCPSink in core/ScpFileSystem.cpp due to insufficient validation of user-supplied input. A remote attacker can send arbitrary files via the server and potentially overwrite unrelated files.

Mitigation

Update to version 5.14 beta.

Vulnerable software versions

WinSCP: 5.0 - 5.14.4 RC

External links

http://github.com/winscp/winscp/commit/49d876f2c5fc00bcedaa986a7cf6dedd6bf16f54
http://winscp.net/eng/docs/history
http://winscp.net/tracker/1675


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.



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