csaf_redhat - rhsa-2024

rhsa-2024_0625

Vulnerability from csaf_redhat

Published

2024-01-31 08:36

Modified

2024-09-18 08:23

Summary

Red Hat Security Advisory: libssh security update

Notes

Topic

An update for libssh is now available for Red Hat Enterprise Linux 8.8 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fix(es): * ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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        "name": "Truncation of Security-relevant Information"
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          "text": "A flaw was found in the SSH channel integrity. By manipulating sequence numbers during the handshake, an attacker can remove the initial messages on the secure channel without causing a MAC failure. For example, an attacker could disable the ping extension and thus disable the new countermeasure in OpenSSH 9.5 against keystroke timing attacks.",
          "title": "Vulnerability description"
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          "text": "ssh: Prefix truncation attack on Binary Packet Protocol (BPP)",
          "title": "Vulnerability summary"
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          "text": "This CVE is classified as moderate because the attack requires an active Man-in-the-Middle (MITM) who can intercept and modify the connection\u0027s traffic at the TCP/IP layer.\n\nAlthough the attack is cryptographically innovative, its security impact is fortunately quite limited. It only allows the deletion of consecutive messages, and deleting most messages at this protocol stage prevents user authentication from proceeding, leading to a stalled connection.\n\nThe most significant identified impact is that it enables a MITM to delete the SSH2_MSG_EXT_INFO message sent before authentication begins. This allows the attacker to disable a subset of keystroke timing obfuscation features. However, there is no other observable impact on session secrecy or session integrity.",
          "title": "Statement"
        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-48795"
        },
        {
          "category": "external",
          "summary": "RHBZ#2254210",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254210"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-48795",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-48795"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-48795",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-48795"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/solutions/7071748",
          "url": "https://access.redhat.com/solutions/7071748"
        },
        {
          "category": "external",
          "summary": "https://terrapin-attack.com/",
          "url": "https://terrapin-attack.com/"
        }
      ],
      "release_date": "2023-12-18T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing these updated packages, all running applications using libssh must be restarted for this update to take effect.",
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          "url": "https://access.redhat.com/errata/RHSA-2024:0625"
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          "details": "Update to the last version and check that client and server provide kex pseudo-algorithms indicating usage of the updated version of the protocol which is protected from the attack. If \"kex-strict-c-v00@openssh.com\" is provided by clients and \"kex-strict-s-v00@openssh.com\" is in the server\u0027s reply, no other steps are necessary.\n\nDisabling ciphers if necessary:\n\nIf \"kex-strict-c-v00@openssh.com\" is not provided by clients or \"kex-strict-s-v00@openssh.com\" is absent in the server\u0027s reply, you can disable the following ciphers and HMACs as a workaround on RHEL-8 and RHEL-9:\n\n1. chacha20-poly1305@openssh.com\n2. hmac-sha2-512-etm@openssh.com\n3. hmac-sha2-256-etm@openssh.com\n4. hmac-sha1-etm@openssh.com\n5. hmac-md5-etm@openssh.com\n\nTo do that through crypto-policies, one can apply a subpolicy with the following content:\n```\ncipher@SSH = -CHACHA20-POLY1305\nssh_etm = 0\n```\ne.g., by putting these lines into `/etc/crypto-policies/policies/modules/CVE-2023-48795.pmod`, applying the resulting subpolicy with `update-crypto-policies --set $(update-crypto-policies --show):CVE-2023-48795` and restarting openssh server.\n\nOne can verify that the changes are in effect by ensuring the ciphers listed above are missing from both `/etc/crypto-policies/back-ends/openssh.config` and `/etc/crypto-policies/back-ends/opensshserver.config`.\n\nFor more details on using crypto-policies, please refer to https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/security_hardening/using-the-system-wide-cryptographic-policies_security-hardening\n\nNote that this procedure does limit the interoperability of the host and is only suggested as a temporary mitigation until the issue is fully resolved with an update.\n\nFor RHEL-7: \nWe can recommend to use strict MACs and Ciphers on RHEL7 in both files /etc/ssh/ssh_config and /etc/ssh/sshd_config.\n\nBelow strict set of Ciphers and MACs can be used as mitigation for RHEL 7.\n\n```\nCiphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com\nMACs umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512\n```\n\n- For Openshift Container Platform 4:\nPlease refer the KCS[1] document for verifying the fix in RHCOS.\n\n[1] https://access.redhat.com/solutions/7071748",
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "ssh: Prefix truncation attack on Binary Packet Protocol (BPP)"
    }
  ]
}

cve-2023-48795

Vulnerability from cvelistv5

Published

2023-12-18 00:00

Modified

2024-08-02 21:46

Severity

Summary

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.

References

URL	Tags
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
https://matt.ucc.asn.au/dropbear/CHANGES
https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES
https://www.netsarang.com/en/xshell-update-history/
https://www.paramiko.org/changelog.html
https://www.openssh.com/openbsd.html
https://github.com/openssh/openssh-portable/commits/master
https://groups.google.com/g/golang-announce/c/-n5WqVC18LQ
https://www.bitvise.com/ssh-server-version-history
https://github.com/ronf/asyncssh/tags
https://gitlab.com/libssh/libssh-mirror/-/tags
https://www.reddit.com/r/sysadmin/comments/18idv52/cve202348795_why_is_this_cve_still_undisclosed/
https://github.com/erlang/otp/blob/d1b43dc0f1361d2ad67601169e90a7fc50bb0369/lib/ssh/doc/src/notes.xml#L39-L42
https://www.openssh.com/txt/release-9.6
https://jadaptive.com/important-java-ssh-security-update-new-ssh-vulnerability-discovered-cve-2023-48795/
https://www.terrapin-attack.com
https://github.com/mkj/dropbear/blob/17657c36cce6df7716d5ff151ec09a665382d5dd/CHANGES#L25
https://github.com/ronf/asyncssh/blob/develop/docs/changes.rst
https://thorntech.com/cve-2023-48795-and-sftp-gateway/
https://github.com/warp-tech/russh/releases/tag/v0.40.2
https://github.com/TeraTermProject/teraterm/commit/7279fbd6ef4d0c8bdd6a90af4ada2899d786eec0
https://www.openwall.com/lists/oss-security/2023/12/18/2
https://twitter.com/TrueSkrillor/status/1736774389725565005
https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05d
https://github.com/paramiko/paramiko/issues/2337
https://groups.google.com/g/golang-announce/c/qA3XtxvMUyg
https://news.ycombinator.com/item?id=38684904
https://news.ycombinator.com/item?id=38685286
http://www.openwall.com/lists/oss-security/2023/12/18/3	mailing-list
https://github.com/mwiede/jsch/issues/457
https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.10&id=10e09e273f69e149389b3e0e5d44b8c221c2e7f6
https://github.com/erlang/otp/releases/tag/OTP-26.2.1
https://github.com/advisories/GHSA-45x7-px36-x8w8
https://security-tracker.debian.org/tracker/source-package/libssh2
https://security-tracker.debian.org/tracker/source-package/proftpd-dfsg
https://security-tracker.debian.org/tracker/CVE-2023-48795
https://bugzilla.suse.com/show_bug.cgi?id=1217950
https://bugzilla.redhat.com/show_bug.cgi?id=2254210
https://bugs.gentoo.org/920280
https://ubuntu.com/security/CVE-2023-48795
https://www.suse.com/c/suse-addresses-the-ssh-v2-protocol-terrapin-attack-aka-cve-2023-48795/
https://access.redhat.com/security/cve/cve-2023-48795
https://github.com/mwiede/jsch/pull/461
https://github.com/drakkan/sftpgo/releases/tag/v2.5.6
https://github.com/libssh2/libssh2/pull/1291
https://forum.netgate.com/topic/184941/terrapin-ssh-attack
https://github.com/jtesta/ssh-audit/commit/8e972c5e94b460379fe0c7d20209c16df81538a5
https://github.com/rapier1/hpn-ssh/releases
https://github.com/proftpd/proftpd/issues/456
https://github.com/TeraTermProject/teraterm/releases/tag/v5.1
https://github.com/mwiede/jsch/compare/jsch-0.2.14...jsch-0.2.15
https://oryx-embedded.com/download/#changelog
https://www.crushftp.com/crush10wiki/Wiki.jsp?page=Update
https://github.com/connectbot/sshlib/compare/2.2.21...2.2.22
https://github.com/connectbot/sshlib/commit/5c8b534f6e97db7ac0e0e579331213aa25c173ab
https://github.com/mscdex/ssh2/commit/97b223f8891b96d6fc054df5ab1d5a1a545da2a3
https://nest.pijul.com/pijul/thrussh/changes/D6H7OWTTMHHX6BTB3B6MNBOBX2L66CBL4LGSEUSAI2MCRCJDQFRQC
https://crates.io/crates/thrussh/versions
https://github.com/NixOS/nixpkgs/pull/275249
http://www.openwall.com/lists/oss-security/2023/12/19/5	mailing-list
https://www.freebsd.org/security/advisories/FreeBSD-SA-23:19.openssh.asc
https://arstechnica.com/security/2023/12/hackers-can-break-ssh-channel-integrity-using-novel-data-corruption-attack/
http://www.openwall.com/lists/oss-security/2023/12/20/3	mailing-list
http://packetstormsecurity.com/files/176280/Terrapin-SSH-Connection-Weakening.html
https://github.com/proftpd/proftpd/blob/d21e7a2e47e9b38f709bec58e3fa711f759ad0e1/RELEASE_NOTES
https://github.com/proftpd/proftpd/blob/0a7ea9b0ba9fcdf368374a226370d08f10397d99/RELEASE_NOTES
https://github.com/apache/mina-sshd/issues/445
https://github.com/hierynomus/sshj/issues/916
https://github.com/janmojzis/tinyssh/issues/81
https://www.openwall.com/lists/oss-security/2023/12/20/3
https://security-tracker.debian.org/tracker/source-package/trilead-ssh2
https://github.com/net-ssh/net-ssh/blob/2e65064a52d73396bfc3806c9196fc8108f33cd8/CHANGES.txt#L14-L16
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/	vendor-advisory
https://www.debian.org/security/2023/dsa-5586	vendor-advisory
https://www.lancom-systems.de/service-support/allgemeine-sicherheitshinweise#c243508
https://www.theregister.com/2023/12/20/terrapin_attack_ssh
https://filezilla-project.org/versions.php
https://nova.app/releases/#v11.8
https://roumenpetrov.info/secsh/#news20231220
https://www.vandyke.com/products/securecrt/history.txt
https://help.panic.com/releasenotes/transmit5/
https://github.com/PowerShell/Win32-OpenSSH/releases/tag/v9.5.0.0p1-Beta
https://github.com/PowerShell/Win32-OpenSSH/issues/2189
https://winscp.net/eng/docs/history#6.2.2
https://www.bitvise.com/ssh-client-version-history#933
https://github.com/cyd01/KiTTY/issues/520
https://www.debian.org/security/2023/dsa-5588	vendor-advisory
https://github.com/ssh-mitm/ssh-mitm/issues/165
https://news.ycombinator.com/item?id=38732005
https://lists.debian.org/debian-lts-announce/2023/12/msg00017.html	mailing-list
https://security.gentoo.org/glsa/202312-16	vendor-advisory
https://security.gentoo.org/glsa/202312-17	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YQLUQWLIHDB5QCXQEX7HXHAWMOKPP5O/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7EYCFQCTSGJXWO3ZZ44MGKFC5HA7G3Y/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APYIXIQOVDCRWLHTGB4VYMAUIAQLKYJ3/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI3EHAHABFQK7OABNCSF5GMYP6TONTI7/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KMZCVGUGJZZVDPCVDA7TEB22VUCNEXDD/	vendor-advisory
https://security.netapp.com/advisory/ntap-20240105-0004/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3CAYYW35MUTNO65RVAELICTNZZFMT2XS/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C3AFMZ6MH2UHHOPIWT5YLSFV3D2VB3AC/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BL5KTLOSLH2KHRN4HCXJPK3JUVLDGEL6/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33XHJUB6ROFUOH2OQNENFROTVH6MHSHA/	vendor-advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0002
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I724O3LSRCPO4WNVIXTZCT4VVRMXMMSG/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYEDEXIKFKTUJIN43RG4B7T5ZS6MHUSP/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y74KVCPEPT4MVU3LHDWCNNOXOE5ZLUR/	vendor-advisory
https://lists.debian.org/debian-lts-announce/2024/01/msg00013.html	mailing-list
https://lists.debian.org/debian-lts-announce/2024/01/msg00014.html	mailing-list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L5Y6MNNVAPIJSXJERQ6PKZVCIUXSNJK7/	vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3JIMLVBDWOP4FUPXPTB4PGHHIOMGFLQE/	vendor-advisory
https://support.apple.com/kb/HT214084
http://seclists.org/fulldisclosure/2024/Mar/21	mailing-list
https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html	mailing-list
http://www.openwall.com/lists/oss-security/2024/04/17/8	mailing-list
http://www.openwall.com/lists/oss-security/2024/03/06/3	mailing-list

Impacted products

Vendor	Product
n/a	n/a

Show details on NVD website