rhsa-2024:1998
Vulnerability from csaf_redhat
Published
2024-04-23 14:34
Modified
2025-08-03 13:19
Summary
Red Hat Security Advisory: libreswan security update

Notes

Topic
An update for libreswan is available for Red Hat Enterprise Linux 8. 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
Libreswan is an implementation of IPsec and IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN). Security Fix(es): * libreswan: Missing PreSharedKey for connection can cause crash (CVE-2024-2357) 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.
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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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Andrew Vaughn"
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      "cve": "CVE-2024-2357",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
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      "discovery_date": "2024-03-11T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2268952"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Libreswan. This issue causes Libreswan to restart under some IKEv2 retransmit scenarios when a connection is configured to use PreSharedKeys (authby=secret), and the connection cannot find a matching configured secret. When automatically added on startup using the auto= keyword, it can cause repeated crashes, leading to a denial of service.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "libreswan: Missing PreSharedKey for connection can cause crash",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Libreswan may restart repeatedly under certain IKEv2 retransmission scenarios when using PreSharedKeys (authby=secret) if the connection cannot find a matching configured secret. If such a connection is added automatically on startup using the auto= keyword, it can lead to repeated crashes, causing a denial of service. The vulnerability arises when IKEv2 fails to find its PreSharedKey for the AUTH payload in the IKE_AUTH Exchange, resulting in assertion failure and daemon crashes. This vulnerability is triggered by local misconfiguration, and there is no known exploitation by external peers.\n\nWithin regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-400: Uncontrolled Resource Consumption vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\n\nRed Hat restricts access to all platform information by default, granting access only after successful hard token-based multi-factor authentication (MFA) and enforcing least privilege to ensure only authorized roles can execute or modify code. The environment employs malicious code protections, including IDS/IPS and antimalware tools to detect threats and monitor resource usage, helping prevent uncontrolled consumption that could lead to system failure. Additional safeguards, such as web application firewalls and load-balancing strategies, protect against resource exhaustion and performance degradation. Event logs are centrally collected, correlated, and analyzed to support monitoring, alerting, and retention, aiding in the detection of abnormal behavior and potential denial-of-service (DoS) conditions. Static code analysis and peer reviews enforce strong input validation and error handling, reducing the likelihood of input-based DoS attacks.",
          "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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          "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2024-2357"
        },
        {
          "category": "external",
          "summary": "RHBZ#2268952",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2268952"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2024-2357",
          "url": "https://www.cve.org/CVERecord?id=CVE-2024-2357"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-2357",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-2357"
        },
        {
          "category": "external",
          "summary": "https://github.com/libreswan/libreswan/commit/cb9e1047d33fde695d63a95854c2bc2470a476c8.patch",
          "url": "https://github.com/libreswan/libreswan/commit/cb9e1047d33fde695d63a95854c2bc2470a476c8.patch"
        },
        {
          "category": "external",
          "summary": "https://libreswan.org/security/CVE-2024-2357",
          "url": "https://libreswan.org/security/CVE-2024-2357"
        }
      ],
      "release_date": "2024-03-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-04-23T14:34:44+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
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            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.ppc64le",
            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.s390x",
            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.src",
            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.x86_64",
            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.aarch64",
            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.ppc64le",
            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.s390x",
            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.x86_64",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.aarch64",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.ppc64le",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.s390x",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2024:1998"
        },
        {
          "category": "workaround",
          "details": "As a workaround to prevent the misconfiguration from causing the crash, place an unguessable long random \"catch-all\" secret in /etc/ipsec.secrets, for example, using the following command:\n\necho -e \"# CVE-2024-2357 workaround\\n: PSK \\\"$(openssl rand -hex 32)\\\"\" \u003e\u003e /etc/ipsec.secrets\n\nThis will ensure a PSK secret is always found, but it will always be wrong, and thus authentication will still properly fail.",
          "product_ids": [
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            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.s390x",
            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.src",
            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.x86_64",
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-8.9.0.Z.MAIN:libreswan-0:4.12-2.el8_9.2.aarch64",
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            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.ppc64le",
            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.s390x",
            "AppStream-8.9.0.Z.MAIN:libreswan-debuginfo-0:4.12-2.el8_9.2.x86_64",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.aarch64",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.ppc64le",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.s390x",
            "AppStream-8.9.0.Z.MAIN:libreswan-debugsource-0:4.12-2.el8_9.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libreswan: Missing PreSharedKey for connection can cause crash"
    }
  ]
}


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