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…
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EPSS puts the probability of exploitation in the next 30 days at 93.3%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 93.31% probability · 100th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-354
- Affected
- openbsd/openssh · putty/putty · filezilla-project/filezilla client · panic/transmit 5 · panic/nova · roumenpetrov/pkixssh · winscp/winscp · bitvise/ssh client · bitvise/ssh server · lancom-systems/lcos · lancom-systems/lcos fx · lancom-systems/lcos lx · lancom-systems/lcos sx · lancom-systems/lanconfig · vandyke/securecrt · libssh/libssh · net-ssh/net-ssh · ssh2 project/ssh2 · proftpd/proftpd · freebsd/freebsd · +40 more
- Source
- cve@mitre.org
References
- http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.htmlThird Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2024/Mar/21Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/12/18/3Mailing List
- http://www.openwall.com/lists/oss-security/2023/12/19/5Mailing List
- http://www.openwall.com/lists/oss-security/2023/12/20/3Mailing List, Mitigation
- http://www.openwall.com/lists/oss-security/2024/03/06/3Mailing List
- http://www.openwall.com/lists/oss-security/2024/04/17/8Mailing List
- https://access.redhat.com/security/cve/cve-2023-48795Third Party Advisory
- https://arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/Press/Media Coverage
- https://bugs.gentoo.org/920280Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=2254210Issue Tracking
- https://bugzilla.suse.com/show_bug.cgi?id=1217950Issue Tracking
- https://crates.io/crates/thrussh/versionsRelease Notes
- https://filezilla-project.org/versions.phpRelease Notes
- https://forum.netgate.com/topic/184941/terrapin-ssh-attackIssue Tracking
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.10&id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6Patch
- https://github.com/NixOS/nixpkgs/pull/275249Release Notes
- https://github.com/PowerShell/Win32-OpenSSH/issues/2189Issue Tracking
- https://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-BetaRelease Notes
- https://github.com/TeraTermProject/teraterm/commit/7279fbd6ef4d0c8bdd6a90af4ada2899d786eec0Patch
- https://github.com/TeraTermProject/teraterm/releases/tag/v5.1Release Notes
- https://github.com/advisories/GHSA-45x7-px36-x8w8Third Party Advisory
- https://github.com/apache/mina-sshd/issues/445Issue Tracking
- https://github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173abPatch
- https://github.com/connectbot/sshlib/compare/2.2.21...2.2.22Third Party Advisory
- https://github.com/cyd01/KiTTY/issues/520Issue Tracking
- https://github.com/drakkan/sftpgo/releases/tag/v2.5.6Release Notes
- https://github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42Patch
- https://github.com/erlang/otp/releases/tag/OTP-26.2.1Release Notes
- https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.