alsa-2021:1811
Vulnerability from osv_almalinux
Published
2021-05-18 06:09
Modified
2021-11-12 10:20
Summary
Moderate: libvncserver security update
Details

LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.

Security Fix(es):

  • libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)

  • libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)

  • libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)

  • libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)

  • libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

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 AlmaLinux Release Notes linked from the References section.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "libvncserver"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.11-17.el8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "libvncserver-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.11-17.el8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "LibVNCServer is a C library that enables you to implement VNC server functionality into own programs.\n\nSecurity Fix(es):\n\n* libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)\n\n* libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)\n\n* libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)\n\n* libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)\n\n* libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)\n\nFor 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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.",
  "id": "ALSA-2021:1811",
  "modified": "2021-11-12T10:20:56Z",
  "published": "2021-05-18T06:09:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2021-1811.html"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2018-21247"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2019-20839"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-14397"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-14405"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2020-25708"
    }
  ],
  "related": [
    "CVE-2018-21247",
    "CVE-2019-20839",
    "CVE-2020-14397",
    "CVE-2020-14405",
    "CVE-2020-25708"
  ],
  "summary": "Moderate: libvncserver security update"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.