Detections
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Amazon Linux 2023 : openssh, openssh-clients, openssh-keycat (ALAS2023-2023-462)
medium Nessus Plugin ID 187062
Language:
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2023-462 advisory.- The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in [email protected] and (if CBC is used) the [email protected] MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.
(CVE-2023-48795)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Run 'dnf update openssh --releasever 2023.3.20231218' to update your system.See Also
https://alas.aws.amazon.com/AL2023/ALAS-2023-462.html
Plugin Details
Severity: Medium
ID: 187062
File Name: al2023_ALAS2023-2023-462.nasl
Version: 1.7
Type: local
Agent: unix
Published: 12/18/2023
Updated: 12/29/2023
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.1
CVSS v2
Risk Factor: Medium
Base Score: 5.4
Temporal Score: 4.2
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:N
CVSS Score Source: CVE-2023-48795
CVSS v3
Risk Factor: Medium
Base Score: 5.9
Temporal Score: 5.3
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:openssh-clients, p-cpe:/a:amazon:linux:openssh-clients-debuginfo, p-cpe:/a:amazon:linux:openssh-keycat, p-cpe:/a:amazon:linux:pam_ssh_agent_auth, p-cpe:/a:amazon:linux:openssh-debugsource, p-cpe:/a:amazon:linux:openssh-keycat-debuginfo, p-cpe:/a:amazon:linux:openssh-server, p-cpe:/a:amazon:linux:openssh-server-debuginfo, p-cpe:/a:amazon:linux:pam_ssh_agent_auth-debuginfo, p-cpe:/a:amazon:linux:openssh, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:openssh-debuginfo
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 12/18/2023
Vulnerability Publication Date: 12/18/2023
Reference Information
CVE: CVE-2023-48795
IAVA: 2023-A-0703