rhsa-2023_6497
Vulnerability from csaf_redhat
Published
2023-11-07 08:56
Modified
2024-11-22 23:48
Summary
Red Hat Security Advisory: libX11 security update

Notes

Topic
An update for libX11 is now available for Red Hat Enterprise Linux 9. 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
The libX11 packages contain the core X11 protocol client library. Security Fix(es): * libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow (CVE-2023-3138) 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 9.3 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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          "text": "A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The identified security vulnerability in the libX11 library, categorized with a moderate impact, stems from a lack of bounds checking in certain functions within the library\u0027s InitExt.c file. Specifically, these functions do not verify that the values provided for Request, Event, or Error IDs fall within the bounds specified by the X11 protocol. Consequently, if a malicious X server or intermediary manipulates these values, it can trigger memory corruption within the client\u0027s Display structure. While this can lead to crashes or instability within the client application, the impact is constrained within the client\u0027s memory space and does not directly compromise sensitive data or system resources beyond it. The vulnerability requires specific conditions, such as interaction with a malicious server or intermediary, which limits its practical exploitability.",
          "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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        {
          "category": "external",
          "summary": "https://lists.x.org/archives/xorg-announce/2023-June/003407.html",
          "url": "https://lists.x.org/archives/xorg-announce/2023-June/003407.html"
        }
      ],
      "release_date": "2023-06-15T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2023-11-07T08:56:42+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",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2023:6497"
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H",
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow"
    }
  ]
}


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