ubuntu.com
Open in
urlscan Pro
2620:2d:4000:1::27
Public Scan
URL:
https://ubuntu.com/security/CVE-2023-48795
Submission: On June 19 via api from US — Scanned from GB
Submission: On June 19 via api from US — Scanned from GB
Form analysis
1 forms found in the DOM/search
<form action="/search" class="p-search-box is-light">
<input type="search" class="p-search-box__input" name="q" placeholder="Search our sites" required="" aria-label="Search our sites">
<button type="reset" class="p-search-box__reset">
<i class="p-icon--close"></i>
</button>
<button type="submit" class="p-search-box__button">
<i class="p-icon--search"></i>
</button>
</form>
Text Content
Skip to main content Canonical Ubuntu * * Menu * Products * Use cases * Support * Community * Get Ubuntu * All Canonical * Back * Products * Back * Canonical * Ubuntu * Ubuntu Pro * Snapcraft * LXD * MAAS * OpenStack * Ceph * Kubernetes * Juju * Also from Canonical * Back * Anbox Cloud * Launchpad * Ubuntu on public clouds * Multipass * Cloud-init * Landscape * Netplan * Charmed Kubeflow * MicroCloud * About * Back * Canonical * Press centre * Careers * Blog * Documentation * Resources * Partners * Contact us * Sign in * * Canonical Get to know Canonical, the company behind the products. * Ubuntu The world's favourite Linux OS for servers, desktops and IoT. * Ubuntu Pro One subscription for security maintenance, support, FIPS and other compliance certifications. * Snapcraft The app store for Linux: secure packages and ultra-reliable updates. * LXD A pure-container hypervisor. Run system containers and VMs at scale. * MAAS Build a bare metal cloud with super fast server provisioning. * OpenStack Upgrades, maintenance, support, and fully managed options for long-term, low-cost infra. * Ceph Software-defined storage that lowers your total cost of ownership. * Kubernetes App portability for K8s on VMware, Amazon, Azure, Google, Oracle, IBM and bare metal. * Juju Deploy, integrate and manage applications at any scale, on any infrastructure. -------------------------------------------------------------------------------- Also from Canonical Anbox Cloud Stream Android applications to any device. Launchpad The software collaboration platform behind Ubuntu. Ubuntu on public clouds Optimised Ubuntu for public clouds. Multipass Spin up Ubuntu VMs on Windows, Mac and Linux. Cloud-init Control and customise your cloud instances. Landscape Systems management and security patching for Ubuntu. Netplan Simplify and standardise complex network configuration. Charmed Kubeflow AI and MLOps at any scale, on any cloud. MicroCloud Deploy a fully functional cloud in minutes. -------------------------------------------------------------------------------- About * Canonical * Press centre * Careers * Blog * Documentation * Resources * Partners * Contact us Security * ESM * Livepatch * Certifications & Hardening * CVEs * Notices * Docker Images Your submission was sent successfully! Close You have successfully unsubscribed! Close Thank you for signing up for our newsletter! In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close CVE-2023-48795 Published: 18 December 2023 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 chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com 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. NOTES AuthorNote mdeslaur Per upstream openssh developers: While cryptographically novel, the security impact of this attack is fortunately very limited as it only allows deletion of consecutive messages, and deleting most messages at this stage of the protocol prevents user user authentication from proceeding and results in a stuck connection. The most serious identified impact is that it lets a MITM to delete the SSH2_MSG_EXT_INFO message sent before authentication starts, allowing the attacker to disable a subset of the keystroke timing obfuscation features introduced in OpenSSH 9.5. There is no other discernable impact to session secrecy or session integrity. sbeattie putty fixes include some refactoring commits that are used by the added strict kex mode support seth-arnold openssh-ssh1 is provided for compatibility with old devices that cannot be upgraded to modern protocols. Thus we may not provide security support for this package if doing so would prevent access to equipment. jdstrand snapd contains an embedded copy of golang-go.crypto lxd in 18.04 LTS and earlier contains an embedded copy of golang-go.crypto sbeattie proftpd-dfsg contains an ssh implementation in mod-sftp (distributed in proftpd-mod-crypto/proftpd-basic) mdeslaur per Debian, libssh2 older than mantic isn't vulnerable as it doesn't support ChaCha20-Poly1305 and CBC-EtM. ccdm94 libssh will be marked as not affected for bionic and earlier as per the above note. ChaCha20-Poly1305 and CBC-EtM are present only in libssh 0.8.0 (released 2018-08-10. Bionic is version 0.8.0, but based on commit 94fa1e38, which was released 2017-08-25) and later. Patches provided by upstream do not apply cleanly to versions in bionic and earlier as several functionalities are not present in these versions of the code (making backports a more likely to introduce regressions) further supporting the defined not affected status. PRIORITY Medium CVSS 3 SEVERITY SCORE 5.9 Score breakdown STATUS Package Release Status dropbear Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Ignored (end of standard support) upstream Needs triage xenial Needs triage Patches: upstream: https://github.com/mkj/dropbear/commit/6e43be5c7b99dbee49dc72b6f989f29fdd7e9356 filezilla Launchpad, Ubuntu, Debian bionic Not vulnerable (code not present) focal Released (3.46.3-1ubuntu0.1) jammy Released (3.58.0-1ubuntu0.1) lunar Ignored (end of life, was needed) mantic Released (3.65.0-3ubuntu0.1) noble Released (3.66.4-1) trusty Does not exist upstream Released (3.66.4.) xenial Not vulnerable (code not present) golang-go.crypto Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Ignored (end of standard support) upstream Needs triage xenial Needs triage Patches: upstream: https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05d libssh Launchpad, Ubuntu, Debian bionic Not vulnerable (code not present) focal Released (0.9.3-2ubuntu2.4) jammy Released (0.9.6-2ubuntu0.22.04.2) lunar Released (0.10.4-2ubuntu0.2) mantic Released (0.10.5-3ubuntu1.1) noble Not vulnerable (0.10.6-2) trusty Ignored (end of standard support) upstream Released (0.10.6-1) xenial Not vulnerable (code not present) Patches: upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/4cef5e965a46e9271aed62631b152e4bd23c1e3c upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/0870c8db28be9eb457ee3d4f9a168959d9507efd upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/5846e57538c750c5ce67df887d09fa99861c79c6 upstream: https://gitlab.com/libssh/libssh-mirror/-/commit/89df759200d31fc79fbbe213d8eda0d329eebf6d libssh2 Launchpad, Ubuntu, Debian bionic Not vulnerable focal Not vulnerable (1.8.0-2.1ubuntu0.1) jammy Not vulnerable (1.10.0-3) lunar Not vulnerable (1.10.0-3) mantic Released (1.11.0-2ubuntu0.1) noble Not vulnerable (1.11.0-4) trusty Not vulnerable upstream Released (1.11.0-4) xenial Not vulnerable Patches: upstream: https://github.com/libssh2/libssh2/commit/d34d9258b8420b19ec3f97b4cc5bf7aa7d98e35a upstream: https://github.com/libssh2/libssh2/pull/1291 lxd Launchpad, Ubuntu, Debian bionic Released (3.0.3-0ubuntu1~18.04.2+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only) focal Not vulnerable (code-not-present) jammy Does not exist lunar Does not exist mantic Does not exist noble Does not exist trusty Does not exist upstream Needs triage xenial Released (2.0.11-0ubuntu1~16.04.4+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only) openssh Launchpad, Ubuntu, Debian bionic Released (1:7.6p1-4ubuntu0.7+esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-only) focal Released (1:8.2p1-4ubuntu0.10) jammy Released (1:8.9p1-3ubuntu0.5) lunar Released (1:9.0p1-1ubuntu8.6) mantic Released (1:9.3p1-1ubuntu3.1) noble Released (1:9.6p1-3ubuntu1) trusty Needs triage upstream Released (1:9.5p1-1) xenial Released (1:7.2p2-4ubuntu2.10+esm5) Available with Ubuntu Pro or Ubuntu Pro (Infra-only) Patches: upstream: https://github.com/openssh/openssh-portable/commit/1edb00c58f8a6875fad6a497aa2bacf37f9e6cd5 openssh-ssh1 Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Does not exist upstream Ignored (frozen on openssh 7.5p) xenial Does not exist paramiko Launchpad, Ubuntu, Debian bionic Needs triage focal Released (2.6.0-2ubuntu0.3) jammy Released (2.9.3-0ubuntu1.2) lunar Ignored (end of life) mantic Released (2.12.0-2ubuntu1.23.10.2) noble Released (2.12.0-2ubuntu4) trusty Needs triage upstream Needs triage xenial Needs triage Patches: upstream: https://github.com/paramiko/paramiko/commit/be3ffc18cc466e0b0a877d716721353c12561bcc upstream: https://github.com/paramiko/paramiko/commit/4c7f0410c533cdf0df2890512237961f934f5ab9 upstream: https://github.com/paramiko/paramiko/commit/773a174fb1e40e1d18dbe2625e16337ea401119e upstream: https://github.com/paramiko/paramiko/commit/c32be441a5ff0dc4914b22d6d1efa392aebe862f upstream: https://github.com/paramiko/paramiko/commit/f4dedacb9040d27d9844f51c81c28e0247d3e4a3 upstream: https://github.com/paramiko/paramiko/commit/73f079f5a4bbba7f3048dadbe05b24242206745e upstream: https://github.com/paramiko/paramiko/commit/75e311d3c0845a316b6e7b3fae2488d86ad5a270 upstream: https://github.com/paramiko/paramiko/commit/fa46de7feeeb8a01dc471581a0258252ce4f2db6 upstream: https://github.com/paramiko/paramiko/commit/8dcb237f0ee095b1d8b26765c3d41d0ab6963be9 upstream: https://github.com/paramiko/paramiko/commit/58785d29c47570fa700e096d16b9a0d3a6069048 upstream: https://github.com/paramiko/paramiko/commit/96db1e2be856eac66631761bae41167a1ebd2b4e upstream: https://github.com/paramiko/paramiko/commit/33508c920309860c4a775be70f209c2a400e18ec upstream: https://github.com/paramiko/paramiko/commit/30b447b911c39460bbef5e7834e339c43a251316 upstream: https://github.com/paramiko/paramiko/commit/3e4bdf998f5b1508322234a527e8fa432220368b proftpd-dfsg Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Ignored (end of standard support) upstream Needs triage xenial Needs triage putty Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Ignored (end of standard support) upstream Released (0.80-1) xenial Needs triage Patches: upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=9e099151574885f3c717ac10a633a9218db8e7bb upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=f2e7086902b3605c96e54ef9c956ca7ab000010e upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=9fcbb86f715bc03e58921482efe663aa0c662d62 upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=244be5412728a7334a2d457fbac4e0a2597165e5 upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=58fc33a155ad496bdcf380fa6193302240a15ae9 upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=0b00e4ce26d89cd010e31e66fd02ac77cb982367 upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=fdc891d17063ab26cf68c74245ab1fd9771556cb upstream: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=b80a41d386dbfa1b095c17bd2ed001477f302d46 python-asyncssh Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Does not exist upstream Released (2.14.2) xenial Needs triage Patches: upstream: https://github.com/ronf/asyncssh/commit/0bc73254f41acb140187e0c89606311f88de5b7b snapd Launchpad, Ubuntu, Debian bionic Needs triage focal Needs triage jammy Needs triage lunar Ignored (end of life, was needs-triage) mantic Needs triage noble Needs triage trusty Ignored (end of standard support) upstream Needs triage xenial Needs triage SEVERITY SCORE BREAKDOWN Parameter Value Base score 5.9 Attack vector Network Attack complexity High Privileges required None User interaction None Scope Unchanged Confidentiality None Integrity impact High Availability impact None Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N REFERENCES * https://terrapin-attack.com/ * https://www.openwall.com/lists/oss-security/2023/12/18/3 * https://github.com/ronf/asyncssh/security/advisories/GHSA-hfmc-7525-mj55 * https://ubuntu.com/security/notices/USN-6560-1 * https://ubuntu.com/security/notices/USN-6561-1 * https://ubuntu.com/security/notices/USN-6560-2 * https://ubuntu.com/security/notices/USN-6585-1 * https://ubuntu.com/security/notices/USN-6589-1 * https://ubuntu.com/security/notices/USN-6598-1 * https://www.cve.org/CVERecord?id=CVE-2023-48795 * https://ubuntu.com/security/notices/USN-6738-1 * NVD * Launchpad * Debian BUGS * https://github.com/golang/go/issues/64784 * https://github.com/paramiko/paramiko/issues/2337 * https://github.com/libssh2/libssh2/issues/1290 JOIN THE DISCUSSION * Ubuntu security updates mailing list * Security announcements mailing list CANONICAL IS OFFERING EXPANDED SECURITY MAINTENANCE Canonical is offering Ubuntu Expanded Security Maintenance (ESM) for security fixes and essential packages. Find out more about ESM › FURTHER READING * An overview of machine learning security risks * What’s new in security for Ubuntu 24.04 LTS? * Canonical at America Digital Congress in Chile * Canonical’s showcase at HPE Tech Jam 2024 * Ubuntu Explained: How to ensure security and stability in cloud instances—part 3 Back to top * CANONICAL OPENSTACK CANONICAL OPENSTACK * What is OpenStack * Features * Managed * Consulting * Install * Support * CANONICAL CEPH CANONICAL CEPH * What is Ceph * Managed * Consulting * Docs * Install * MANAGED MANAGED * OpenStack * Kubernetes * Ceph * Apps * Observability * Firefighting * CANONICAL KUBERNETES CANONICAL KUBERNETES * What is Kubernetes * Charmed Kubernetes * Managed * Install * Docs * Resources * AI / ML AI / ML * MLOps * Kubeflow * MLflow * Consulting * ROBOTICS ROBOTICS * ROS ESM * What is ROS * Community * Docs * CLOUD CLOUD * What is cloud computing * What is private cloud * What is hybrid cloud * What is multi-cloud * Public cloud * IOT IOT * App store * Embedded Linux * Management * UBUNTU CORE UBUNTU CORE * Features * Success stories * Services * Docs * UBUNTU DESKTOP UBUNTU DESKTOP * Organisations * Developers * Flavours * WSL * UBUNTU SERVER UBUNTU SERVER * Hyperscale * Docs * SECURITY SECURITY * ESM * Livepatch * Certifications & Hardening * CVEs * Notices * Docker Images * DOWNLOADS DOWNLOADS * Desktop * Server * Core * Cloud * OBSERVABILITY OBSERVABILITY * What is observability * Managed * APPLIANCE APPLIANCE * About * Portfolio * Community * Hardware * Virtual machines * SUPPORT SUPPORT * Your subscriptions * Account users * Pricing * Discourse * PRICING PRICING * Consulting * Desktops * Devices * SECTORS * Automotive * Industrial * Government * Telco * Finance * * Containers * Tutorials * 16-04 * Software partnerships * Landscape * Canonical Embedding Programme -------------------------------------------------------------------------------- * Contact us * Contact us * About us * Community * Careers * Blog * Resources * Press centre © 2024 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. * Legal information * Data privacy * Manage your tracker settings * Report a bug on this site * * * * * Go to the top of the page YOUR TRACKER SETTINGS We use cookies and similar methods to recognise visitors and remember preferences. We also use them to measure campaign effectiveness and analyse site traffic. By selecting ‘Accept‘, you consent to the use of these methods by us and trusted third parties. For further details or to change your consent choices at any time see our cookie policy. Accept all and visit site Manage your tracker settings