Debian update for openssh

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 your openssh package to version 1:7.9p1-4, 1:7.4p1-10+deb9u4 or 1:6.7p1-5+deb8u7.

Vulnerable software versions

openssh (Debian package): 1:6.7p1-1 - 1:7.9p1-3

CPE2.3

• cpe:2.3:a:debian:openssh_debian_package:1:6.7p1-1:*:*:*:*:debian_linux:*:*
• cpe:2.3:a:debian:openssh_debian_package:1:6.7p1-2:*:*:*:*:debian_linux:*:*
• cpe:2.3:a:debian:openssh_debian_package:1:6.7p1-3:*:*:*:*:debian_linux:*:*

External links

https://security-tracker.debian.org/tracker/CVE-2017-15906

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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