CVE-2023-48795
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
6.4 Medium
AI Score
Confidence
Low
2.6 Low
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:H/Au:N/C:N/I:P/A:N
0.962 High
EPSS
Percentile
99.5%
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
packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html
seclists.org/fulldisclosure/2024/Mar/21
www.openwall.com/lists/oss-security/2023/12/18/3
www.openwall.com/lists/oss-security/2023/12/19/5
www.openwall.com/lists/oss-security/2023/12/20/3
www.openwall.com/lists/oss-security/2024/03/06/3
www.openwall.com/lists/oss-security/2024/04/17/8
access.redhat.com/security/cve/cve-2023-48795
arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/
bugs.gentoo.org/920280
bugzilla.redhat.com/show_bug.cgi?id=2254210
bugzilla.suse.com/show_bug.cgi?id=1217950
crates.io/crates/thrussh/versions
filezilla-project.org/versions.php
forum.netgate.com/topic/184941/terrapin-ssh-attack
git.libssh.org/projects/libssh.git/commit/?h=stable-0.10&id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6
github.com/advisories/GHSA-45x7-px36-x8w8
github.com/apache/mina-sshd/issues/445
github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173ab
github.com/connectbot/sshlib/compare/2.2.21...2.2.22
github.com/cyd01/KiTTY/issues/520
github.com/drakkan/sftpgo/releases/tag/v2.5.6
github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42
github.com/erlang/otp/releases/tag/OTP-26.2.1
github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05d
github.com/hierynomus/sshj/issues/916
github.com/janmojzis/tinyssh/issues/81
github.com/jtesta/ssh-audit/commit/8e972c5e94b460379fe0c7d20209c16df81538a5
github.com/libssh2/libssh2/pull/1291
github.com/mkj/dropbear/blob/17657c36cce6df7716d5ff151ec09a665382d5dd/CHANGES#L25
github.com/mscdex/ssh2/commit/97b223f8891b96d6fc054df5ab1d5a1a545da2a3
github.com/mwiede/jsch/compare/jsch-0.2.14...jsch-0.2.15
github.com/mwiede/jsch/issues/457
github.com/mwiede/jsch/pull/461
github.com/net-ssh/net-ssh/blob/2e65064a52d73396bfc3806c9196fc8108f33cd8/CHANGES.txt#L14-L16
github.com/NixOS/nixpkgs/pull/275249
github.com/openssh/openssh-portable/commits/master
github.com/paramiko/paramiko/issues/2337
github.com/PowerShell/Win32-OpenSSH/issues/2189
github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-Beta
github.com/proftpd/proftpd/blob/0a7ea9b0ba9fcdf368374a226370d08f10397d99/RELEASE_NOTES
github.com/proftpd/proftpd/blob/d21e7a2e47e9b38f709bec58e3fa711f759ad0e1/RELEASE_NOTES
github.com/proftpd/proftpd/blob/master/RELEASE_NOTES
github.com/proftpd/proftpd/issues/456
github.com/rapier1/hpn-ssh/releases
github.com/ronf/asyncssh/blob/develop/docs/changes.rst
github.com/ronf/asyncssh/tags
github.com/ssh-mitm/ssh-mitm/issues/165
github.com/TeraTermProject/teraterm/commit/7279fbd6ef4d0c8bdd6a90af4ada2899d786eec0
github.com/TeraTermProject/teraterm/releases/tag/v5.1
github.com/warp-tech/russh/releases/tag/v0.40.2
gitlab.com/libssh/libssh-mirror/-/tags
groups.google.com/g/golang-announce/c/-n5WqVC18LQ
groups.google.com/g/golang-announce/c/qA3XtxvMUyg
help.panic.com/releasenotes/transmit5/
jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/
lists.debian.org/debian-lts-announce/2023/12/msg00017.html
lists.debian.org/debian-lts-announce/2024/01/msg00013.html
lists.debian.org/debian-lts-announce/2024/01/msg00014.html
lists.debian.org/debian-lts-announce/2024/04/msg00016.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33XHJUB6ROFUOH2OQNENFROTVH6MHSHA/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3CAYYW35MUTNO65RVAELICTNZZFMT2XS/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3JIMLVBDWOP4FUPXPTB4PGHHIOMGFLQE/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YQLUQWLIHDB5QCXQEX7HXHAWMOKPP5O/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y74KVCPEPT4MVU3LHDWCNNOXOE5ZLUR/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APYIXIQOVDCRWLHTGB4VYMAUIAQLKYJ3/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BL5KTLOSLH2KHRN4HCXJPK3JUVLDGEL6/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C3AFMZ6MH2UHHOPIWT5YLSFV3D2VB3AC/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7EYCFQCTSGJXWO3ZZ44MGKFC5HA7G3Y/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYEDEXIKFKTUJIN43RG4B7T5ZS6MHUSP/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I724O3LSRCPO4WNVIXTZCT4VVRMXMMSG/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KMZCVGUGJZZVDPCVDA7TEB22VUCNEXDD/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L5Y6MNNVAPIJSXJERQ6PKZVCIUXSNJK7/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI3EHAHABFQK7OABNCSF5GMYP6TONTI7/
matt.ucc.asn.au/dropbear/CHANGES
nest.pijul.com/pijul/thrussh/changes/D6H7OWTTMHHX6BTB3B6MNBOBX2L66CBL4LGSEUSAI2MCRCJDQFRQC
news.ycombinator.com/item?id=38684904
news.ycombinator.com/item?id=38685286
news.ycombinator.com/item?id=38732005
nova.app/releases/#v11.8
oryx-embedded.com/download/#changelog
psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0002
roumenpetrov.info/secsh/#news20231220
security-tracker.debian.org/tracker/CVE-2023-48795
security-tracker.debian.org/tracker/source-package/libssh2
security-tracker.debian.org/tracker/source-package/proftpd-dfsg
security-tracker.debian.org/tracker/source-package/trilead-ssh2
security.gentoo.org/glsa/202312-16
security.gentoo.org/glsa/202312-17
security.netapp.com/advisory/ntap-20240105-0004/
support.apple.com/kb/HT214084
thorntech.com/cve-2023-48795-and-sftp-gateway/
twitter.com/TrueSkrillor/status/1736774389725565005
ubuntu.com/security/CVE-2023-48795
winscp.net/eng/docs/history#6.2.2
www.bitvise.com/ssh-client-version-history#933
www.bitvise.com/ssh-server-version-history
www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
www.crushftp.com/crush10wiki/Wiki.jsp?page=Update
www.debian.org/security/2023/dsa-5586
www.debian.org/security/2023/dsa-5588
www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc
www.lancom-systems.de/service-support/allgemeine-sicherheitshinweise#c243508
www.netsarang.com/en/xshell-update-history/
www.openssh.com/openbsd.html
www.openssh.com/txt/release-9.6
www.openwall.com/lists/oss-security/2023/12/18/2
www.openwall.com/lists/oss-security/2023/12/20/3
www.paramiko.org/changelog.html
www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/
www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/
www.terrapin-attack.com
www.theregister.com/2023/12/20/terrapin_attack_ssh
www.vandyke.com/products/securecrt/history.txt
Social References
More
Related
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
6.4 Medium
AI Score
Confidence
Low
2.6 Low
CVSS2
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:H/Au:N/C:N/I:P/A:N
0.962 High
EPSS
Percentile
99.5%