rhsa-2024_2504
Vulnerability from csaf_redhat
Published
2024-04-30 10:22
Modified
2024-11-06 05:42
Summary
Red Hat Security Advisory: libssh security update

Notes

Topic
An update for libssh is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Low. 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): * libssh: ProxyCommand/ProxyJump features allow injection of malicious code through hostname (CVE-2023-6004) * libssh: Missing checks for return values for digests (CVE-2023-6918) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 9.4 Release Notes linked from the References section.
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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          "names": [
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          "text": "A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libssh: ProxyCommand/ProxyJump features allow injection of malicious code through hostname",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Despite the potential severity of this issue, the requirement for user interaction to exploit the vulnerability has led to a low severity rating. As a precautionary measure, users are advised to sanitize hostname inputs as a mitigation strategy.",
          "title": "Statement"
        },
        {
          "category": "general",
          "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.",
          "title": "CVSS score applicability"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-6004"
        },
        {
          "category": "external",
          "summary": "RHBZ#2251110",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2251110"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-6004",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-6004"
        },
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-6004",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6004"
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          "category": "external",
          "summary": "https://www.libssh.org/security/advisories/CVE-2023-6004.txt",
          "url": "https://www.libssh.org/security/advisories/CVE-2023-6004.txt"
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      "release_date": "2023-12-18T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2024-04-30T10:22:20+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": "Low"
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      "title": "libssh: ProxyCommand/ProxyJump features allow injection of malicious code through hostname"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Jack Weinstein"
          ],
          "organization": "\u003cmike.code.bb.h@gmail.com\u003e"
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      "cve": "CVE-2023-6918",
      "cwe": {
        "id": "CWE-252",
        "name": "Unchecked Return Value"
      },
      "discovery_date": "2023-12-18T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2254997"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libssh: Missing checks for return values for digests",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability in the libssh abstract layer for message digest operations is deemed to have a low impact due to several mitigating factors. Primarily, the absence of proper checks on return values from supported crypto backends may lead to low-memory situations, failures, NULL dereferences, crashes, or the utilization of uninitialized memory in the Key Derivation Function (KDF). While these potential consequences could disrupt the system, their likelihood is considered low, contributing to the low impact classification.\n\nThe maintainers of libssh, in conjunction with Red Hat, have assigned a CVSS3.1 score of 3.7 to this vulnerability. While the score acknowledges the existence of a vulnerability, the assigned value falls within the lower range of the scale, indicating a relatively modest level of risk.\n\nMoreover, the practical exploitability of this vulnerability is characterized as theoretical and highly unlikely to yield tangible results. The difficulty in successfully exploiting the flaw adds a layer of security, further diminishing the potential impact. While acknowledging the risk of non-matching keys leading to decryption/integrity failures and connection termination, the combination of the low likelihood of exploitation and the relatively lower severity score results in an overall assessment of low impact.",
          "title": "Statement"
        },
        {
          "category": "general",
          "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.",
          "title": "CVSS score applicability"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-6918"
        },
        {
          "category": "external",
          "summary": "RHBZ#2254997",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254997"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-6918",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-6918"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-6918",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6918"
        },
        {
          "category": "external",
          "summary": "https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/",
          "url": "https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/"
        },
        {
          "category": "external",
          "summary": "https://www.libssh.org/security/advisories/CVE-2023-6918.txt",
          "url": "https://www.libssh.org/security/advisories/CVE-2023-6918.txt"
        }
      ],
      "release_date": "2023-12-18T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-04-30T10:22:20+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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          "restart_required": {
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          "url": "https://access.redhat.com/errata/RHSA-2024:2504"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "libssh: Missing checks for return values for digests"
    }
  ]
}


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