rhsa-2011_0871
Vulnerability from csaf_redhat
Published
2011-06-15 10:05
Modified
2024-11-22 04:23
Summary
Red Hat Security Advisory: tigervnc security update

Notes

Topic
Updated tigervnc packages that fix one security issue are now available for Red Hat Enterprise Linux 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
Details
Virtual Network Computing (VNC) is a remote display system which allows you to view a computer's desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients. It was discovered that vncviewer could prompt for and send authentication credentials to a remote server without first properly validating the server's X.509 certificate. As vncviewer did not indicate that the certificate was bad or missing, a man-in-the-middle attacker could use this flaw to trick a vncviewer client into connecting to a spoofed VNC server, allowing the attacker to obtain the client's credentials. (CVE-2011-1775) All tigervnc users should upgrade to these updated packages, which contain a backported patch to correct this issue.
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.


To clipboard 

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        "text": "Updated tigervnc packages that fix one security issue are now available for\nRed Hat Enterprise Linux 6.\n\nThe Red Hat Security Response Team has rated this update as having moderate\nsecurity impact. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available from the CVE link in\nthe References section.",
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        "text": "Virtual Network Computing (VNC) is a remote display system which allows you\nto view a computer\u0027s desktop environment not only on the machine where it\nis running, but from anywhere on the Internet and from a wide variety of\nmachine architectures. TigerVNC is a suite of VNC servers and clients.\n\nIt was discovered that vncviewer could prompt for and send authentication\ncredentials to a remote server without first properly validating the\nserver\u0027s X.509 certificate. As vncviewer did not indicate that the\ncertificate was bad or missing, a man-in-the-middle attacker could use this\nflaw to trick a vncviewer client into connecting to a spoofed VNC server,\nallowing the attacker to obtain the client\u0027s credentials. (CVE-2011-1775)\n\nAll tigervnc users should upgrade to these updated packages, which contain\na backported patch to correct this issue.",
        "title": "Details"
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        "text": "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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          "category": "vendor_fix",
          "date": "2011-06-15T10:05:00+00:00",
          "details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259",
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            "accessVector": "NETWORK",
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            "availabilityImpact": "NONE",
            "baseScore": 2.6,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tigervnc: vncviewer can send password to server without proper validation of the X.509 certificate"
    }
  ]
}


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