Openssh 8.4

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  1. Openssh 8.4p1
  2. Openssh 8.4 Rpm

Current Description

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).

OpenSSH is the premier connectivity tool for remote login with the SSH protocol. It encrypts all traffic to eliminate eavesdropping, connection hijacking, and other attacks. In addition, OpenSSH provides a large suite of secure tunneling capabilities, several authentication methods, and sophisticated configuration options. OpenSSH 8.4 released. Software 1-09-28 08:21 by Alien. News; Ratings; Comments; A new software update is available: OpenSSH 8.4 released A new version of.


Analysis Description

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).

Severity

CVSS 3.x Severity and Metrics:
NIST:NVD
Vector:NVD
Vector:HyperlinkResourcehttp://www.openwall.com/lists/oss-security/2020/12/02/1Mailing ListPatchThird Party Advisoryhttps://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362dPatchThird Party Advisoryhttps://docs.ssh-mitm.at/CVE-2020-14145.htmlThird Party Advisoryhttps://github.com/openssh/openssh-portable/compare/V_8_3_P1..V_8_4_P1PatchThird Party Advisoryhttps://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.pyThird Party Advisoryhttps://security.netapp.com/advisory/ntap-20200709-0004/Third Party Advisoryhttps://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/Third Party Advisory
Openssh

Weakness Enumeration

CWE-IDCWE NameSource
CWE-200Exposure of Sensitive Information to an Unauthorized ActorNIST

Known Affected Software Configurations Switch to CPE 2.2

Openssh 8.4

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

8 change records found show changes

How to upgrade OpenSSH in Centos ?

1. First you need to install few dependencies, like development tools or build essentials and the other required packages :

root@localhost:~ yum groupinstall 'Development Tools'

root@localhost:~ yum install zlib-devel openssl-devel

2 . Download the OpenSSH version 8.0

root@localhost:~ wget -c https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-8.0p1.tar.gz

root@localhost:~ tar -xzf openssh-8.0p1.tar.gz

root@localhost:~ cd openssh-8.0p1/

3 . Install PAM and SELinux Headers

Openssh 8.4p1

root@localhost:~ yum install pam-devel libselinux-devel

4. Compile and install SSH from sources.

root@localhost:~ ./configure --with-md5-passwords --with-pam --with-selinux --with-privsep-path=/var/lib/sshd/ --sysconfdir=/etc/ssh

Openssh 8.4 Rpm

root@localhost:~ make

root@localhost:~ make install Upgrade lion to yosemite.

Openssh 8.4 vulnerabilities

5. Once you have installed OpenSSH, restart SSH and check the version of OpenSSH

Download notion app for mac. root@localhost:~ ssh -V

Mac os el capitan update to mojave. OpenSSH_8.0p1, OpenSSL 1.1.0g