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CVE detail

CVE-2023-48795

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 Server before 9.32, 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.

CVSS 5.9 · MediumBuzz score 22.6

Buzz score

Why this CVE is surfacing

Buzz score total 22.6

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 16.1 · diversity 6.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
16.1
4 evidence mentions in the snapshot
Diversity score
6.5
2 sources across 1 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
4 source links · newest first
  • Security Affairs newsletter Round 453 by Pierluigi Paganini – INTERNATIONAL EDITIONSecurity Affairs

    A new round of the weekly SecurityAffairs newsletter arrived! Every week the best security articles from Security Affairs are free for you in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. Experts spotted a new macOS Backdoor named SpectralBlur linked to North Korea Merck settles with insurers […]

    newssecurityaffairs.comJan 7, 2024, 11:53 AM
  • Terrapin attack allows to downgrade SSH protocol securitySecurity Affairs

    Researchers discovered an SSH vulnerability, called Terrapin, that could allow an attacker to downgrade the connection’s security. Security researchers from Ruhr University Bochum (Fabian Bäumer, Marcus Brinkmann, Jörg Schwenk) discovered a vulnerability, called Terrapin (CVE-2023-48795, CVSS score 5.9), in the Secure Shell (SSH) cryptographic network protocol. An attacker can trigger the flaw to downgrade the […]

    newssecurityaffairs.comJan 2, 2024, 10:18 AM
  • Week in review: Terrapin SSH attack, Mr. Cooper breachHelp Net Security

    Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Creating a formula for effective vulnerability prioritization In this Help Net Security interview, Michael Gorelik, CTO and Head of Malware Research at Morphisec, provides insights into the business impact of vulnerabilities. Subdominator: Open-source tool for detecting subdomain takeovers Subdominator is a dependable and fast open-source command-line interface tool to identify subdomain takeovers. EMBA: Open-source security analyzer for embedded devices The … More →

    newswww.helpnetsecurity.comDec 24, 2023, 9:00 AM
  • SSH vulnerability exploitable in Terrapin attacks (CVE-2023-48795)Help Net Security

    Security researchers have discovered a vulnerability (CVE-2023-48795) in the SSH cryptographic network protocol that could allow an attacker to downgrade the connection’s security by truncating the extension negotiation message. The Terrapin attack Terrapin is a prefix truncation attack targeting the SSH protocol. “By carefully adjusting the sequence numbers during the handshake, an attacker can remove an arbitrary amount of messages sent by the client or server at the beginning of the secure channel without the … More →

    newswww.helpnetsecurity.comDec 19, 2023, 10:11 AM

Exploit code

Public exploit repository references

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0 repository references · best confidence N/A · max 0 stars
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