Unikrn: ssh: unprivileged users may hijack due to backdated ssh version open port found(███.unikrn.com)

2017-08-07T09:27:13
ID H1:257335
Type hackerone
Reporter noob-walid
Modified 2019-03-04T12:45:50

Description

Summary: Vulnerabilities in OpenSSH Session Hijacking Vulnerability is a Medium risk vulnerability that is one of the most frequently found on networks around the world. This issue has been around since at least 1990 but has proven either difficult to detect, difficult to resolve or prone to being overlooked entirely.

Description: You are running a version of OpenSSH which is older.

Versions prior than 7.5 or above are vulnerable to an off by one error that allows local users to gain root access, and it may be possible for remote users to similarly compromise the daemon for remote access.

In addition, a vulnerable SSH client may be compromised by connecting to a malicious SSH daemon that exploits this vulnerability in the client code, thus compromising the client system.An attacker may use this flaw to set up a brute force attack against the remote host. 1. Session Hijacking 2.Remote file inclusion(high) 3.Brute force attack

Steps To Reproduce:

Solution : Upgrade to OpenSSH 7.5 or apply the patch for prior versions. (See: https://www.openssh.org)