CVE-2023-48795

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 [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.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-24-319-08

https://www.cisa.gov/news-events/ics-advisories/icsa-24-193-11

https://cert-portal.siemens.com/productcert/html/ssa-455250.html

https://www.vandyke.com/products/securecrt/history.txt

https://www.theregister.com/2023/12/20/terrapin_attack_ssh

https://www.terrapin-attack.com

https://www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/

https://www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/

https://www.paramiko.org/changelog.html

https://www.openwall.com/lists/oss-security/2023/12/20/3

https://www.openwall.com/lists/oss-security/2023/12/18/2

https://www.openssh.com/txt/release-9.6

https://www.openssh.com/openbsd.html

https://www.netsarang.com/en/xshell-update-history/

https://www.lancom-systems.de/service-support/allgemeine-sicherheitshinweise#c243508

https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc

https://www.debian.org/security/2023/dsa-5588

https://www.debian.org/security/2023/dsa-5586

https://www.crushftp.com/crush10wiki/Wiki.jsp?page=Update

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html

https://www.bitvise.com/ssh-server-version-history

https://www.bitvise.com/ssh-client-version-history#933

https://winscp.net/eng/docs/history#6.2.2

https://ubuntu.com/security/CVE-2023-48795

https://twitter.com/TrueSkrillor/status/1736774389725565005

https://thorntech.com/cve-2023-48795-and-sftp-gateway/

https://support.apple.com/kb/HT214084

https://security.netapp.com/advisory/ntap-20240105-0004/

https://security.gentoo.org/glsa/202312-17

https://security.gentoo.org/glsa/202312-16

https://security-tracker.debian.org/tracker/source-package/trilead-ssh2

https://security-tracker.debian.org/tracker/source-package/proftpd-dfsg

https://security-tracker.debian.org/tracker/source-package/libssh2

https://security-tracker.debian.org/tracker/CVE-2023-48795

https://roumenpetrov.info/secsh/#news20231220

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0002

https://oryx-embedded.com/download/#changelog

https://nova.app/releases/#v11.8

https://news.ycombinator.com/item?id=38732005

https://news.ycombinator.com/item?id=38685286

https://news.ycombinator.com/item?id=38684904

https://nest.pijul.com/pijul/thrussh/changes/D6H7OWTTMHHX6BTB3B6MNBOBX2L66CBL4LGSEUSAI2MCRCJDQFRQC

https://matt.ucc.asn.au/dropbear/CHANGES

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI3EHAHABFQK7OABNCSF5GMYP6TONTI7/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L5Y6MNNVAPIJSXJERQ6PKZVCIUXSNJK7/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KMZCVGUGJZZVDPCVDA7TEB22VUCNEXDD/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I724O3LSRCPO4WNVIXTZCT4VVRMXMMSG/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYEDEXIKFKTUJIN43RG4B7T5ZS6MHUSP/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7EYCFQCTSGJXWO3ZZ44MGKFC5HA7G3Y/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C3AFMZ6MH2UHHOPIWT5YLSFV3D2VB3AC/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BL5KTLOSLH2KHRN4HCXJPK3JUVLDGEL6/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APYIXIQOVDCRWLHTGB4VYMAUIAQLKYJ3/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y74KVCPEPT4MVU3LHDWCNNOXOE5ZLUR/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YQLUQWLIHDB5QCXQEX7HXHAWMOKPP5O/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3JIMLVBDWOP4FUPXPTB4PGHHIOMGFLQE/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3CAYYW35MUTNO65RVAELICTNZZFMT2XS/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33XHJUB6ROFUOH2OQNENFROTVH6MHSHA/

https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html

https://lists.debian.org/debian-lts-announce/2024/01/msg00014.html

https://lists.debian.org/debian-lts-announce/2024/01/msg00013.html

https://lists.debian.org/debian-lts-announce/2023/12/msg00017.html

https://jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/

https://help.panic.com/releasenotes/transmit5/

https://groups.google.com/g/golang-announce/c/qA3XtxvMUyg

https://groups.google.com/g/golang-announce/c/-n5WqVC18LQ

https://gitlab.com/libssh/libssh-mirror/-/tags

https://github.com/warp-tech/russh/releases/tag/v0.40.2

https://github.com/ssh-mitm/ssh-mitm/issues/165

https://github.com/ronf/asyncssh/tags

https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst

https://github.com/rapier1/hpn-ssh/releases

https://github.com/proftpd/proftpd/issues/456

https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES

https://github.com/proftpd/proftpd/blob/d21e7a2e47e9b38f709bec58e3fa711f759ad0e1/RELEASE_NOTES

https://github.com/proftpd/proftpd/blob/0a7ea9b0ba9fcdf368374a226370d08f10397d99/RELEASE_NOTES

https://github.com/paramiko/paramiko/issues/2337

https://github.com/openssh/openssh-portable/commits/master

https://github.com/net-ssh/net-ssh/blob/2e65064a52d73396bfc3806c9196fc8108f33cd8/CHANGES.txt#L14-L16

https://github.com/mwiede/jsch/pull/461

https://github.com/mwiede/jsch/issues/457

https://github.com/mwiede/jsch/compare/jsch-0.2.14...jsch-0.2.15

https://github.com/mscdex/ssh2/commit/97b223f8891b96d6fc054df5ab1d5a1a545da2a3

https://github.com/mkj/dropbear/blob/17657c36cce6df7716d5ff151ec09a665382d5dd/CHANGES#L25

https://github.com/libssh2/libssh2/pull/1291

https://github.com/jtesta/ssh-audit/commit/8e972c5e94b460379fe0c7d20209c16df81538a5

https://github.com/janmojzis/tinyssh/issues/81

https://github.com/hierynomus/sshj/issues/916

https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05d

https://github.com/erlang/otp/releases/tag/OTP-26.2.1

https://github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42

https://github.com/drakkan/sftpgo/releases/tag/v2.5.6

https://github.com/cyd01/KiTTY/issues/520

https://github.com/connectbot/sshlib/compare/2.2.21...2.2.22

https://github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173ab

https://github.com/apache/mina-sshd/issues/445

https://github.com/advisories/GHSA-45x7-px36-x8w8

https://github.com/TeraTermProject/teraterm/releases/tag/v5.1

https://github.com/TeraTermProject/teraterm/commit/7279fbd6ef4d0c8bdd6a90af4ada2899d786eec0

https://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-Beta

https://github.com/PowerShell/Win32-OpenSSH/issues/2189

https://github.com/NixOS/nixpkgs/pull/275249

https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.10&id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6

https://forum.netgate.com/topic/184941/terrapin-ssh-attack

https://filezilla-project.org/versions.php

https://crates.io/crates/thrussh/versions

https://bugzilla.suse.com/show_bug.cgi?id=1217950

https://bugzilla.redhat.com/show_bug.cgi?id=2254210

https://bugs.gentoo.org/920280

https://arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/

https://access.redhat.com/security/cve/cve-2023-48795

http://www.openwall.com/lists/oss-security/2024/04/17/8

http://www.openwall.com/lists/oss-security/2024/03/06/3

http://www.openwall.com/lists/oss-security/2023/12/20/3

http://www.openwall.com/lists/oss-security/2023/12/19/5

http://www.openwall.com/lists/oss-security/2023/12/18/3

http://seclists.org/fulldisclosure/2024/Mar/21

http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4