Denial of service in OpenSSH



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-15906
CWE-ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
 OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor OpenSSH

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Denial of service

EUVDB-ID: #VU9333

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-15906

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The weakness exists in the process_open() function due to improper prevention of write operations in read-only mode. A remote attacker can create zero-length files and cause the service to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Update to version 7.6.

Vulnerable software versions

OpenSSH: 3.6.1p2 - 7.5p1

CPE2.3 External links

https://www.openssh.com/txt/release-7.6


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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