rhba-2024_1127
Vulnerability from csaf_redhat
Published
2024-03-05 18:22
Modified
2024-11-23 03:59
Summary
Red Hat Bug Fix Advisory: libssh bug fix update

Notes

Topic
An update for libssh is now available for Red Hat Enterprise Linux 9.
Details
libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Bug Fix(es): * libssh: ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (JIRA:RHEL-20939)
Terms of Use
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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      "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",
          "date": "2024-03-05T18:22:05+00:00",
          "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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          "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)"
    }
  ]
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
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