Home > Vulnerability Database > CVE-2023-48795

Mend.io Vulnerability Database

CVE-2023-48795

Good to know:

Date: December 17, 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.

Language: C

Severity Score

5.9

Related Resources (152)

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

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

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

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

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

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

Url: https://nvd.nist.gov/vuln/detail/CVE-2023-48795

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Url: https://github.com/warp-tech/russh/security/advisories/GHSA-45x7-px36-x8w8

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

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

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

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

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

Url: https://github.com/paramiko/paramiko/issues/2337#issuecomment-1887642773

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Url: https://github.com/warp-tech/russh/commit/1aa340a7df1d5be1c0f4a9e247aade76dfdd2951

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Url: https://go.dev/cl/550715

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

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

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

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

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

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

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

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

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

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

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

Url: https://github.com/warp-tech/russh

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Url: https://www.terrapin-attack.com

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

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

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

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

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

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

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

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

Url: https://go.dev/issue/64784

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

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

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

Url: https://bugs.gentoo.org/920280

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

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

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

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

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

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

Url: https://www.mend.io/vulnerability-database/CVE-2023-48795

Severity Score

5.9

Weakness Type (CWE)

Insufficient Verification of Data Authenticity

CWE-345

Improper Validation of Integrity Check Value

CWE-354

Top Fix

Upgrade Version

Upgrade to version putty - 0.80, openssh - V_9_6_P1, golang/crypto - v0.17.0, asyncssh - 2.14.2, libssh-0.9.8, libssh-0.10.6, teraterm - v5.1, paramiko - 3.4.0, russh - 0.40.2, com.github.mwiede:jsch:0.2.15, proftpd - v1.3.8b, thrussh - 0.35.1, teraterm - v5.1, org.connectbot:sshlib:2.2.22, mscdex/ssh2 - 1.15.0, jtesta/ssh-audit - v3.1.0, Oryx-Embedded/CycloneSSH - v2.3.4, opnsense/src - 23.7, winscp - 6.2.2, PowerShell/openssh-portable - v9.5.0.0

Learn More

CVSS v3.1

Base Score:	5.9
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	HIGH
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	HIGH
Availability (A):	NONE

Mend.io Vulnerability Database

We found results for “”

CVE-2023-48795

Good to know:

Date: December 17, 2023

Language: C

Severity Score

Related Resources (152)

Severity Score

Weakness Type (CWE)

Top Fix

Upgrade Version

CVSS v3.1

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