The remote Redhat Enterprise Linux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2012:0016 advisory.

    The libxml2 library is a development toolbox providing the implementation     of various XML standards. One of those standards is the XML Path Language     (XPath), which is a language for addressing parts of an XML document.

    A heap-based buffer overflow flaw was found in the way libxml2 decoded     entity references with long names. A remote attacker could provide a     specially-crafted XML file that, when opened in an application linked     against libxml2, would cause the application to crash or, potentially,     execute arbitrary code with the privileges of the user running the     application. (CVE-2011-3919)

    An off-by-one error, leading to a heap-based buffer overflow, was found in     the way libxml2 parsed certain XML files. A remote attacker could provide a     specially-crafted XML file that, when opened in an application linked     against libxml2, would cause the application to crash or, potentially,     execute arbitrary code with the privileges of the user running the     application. (CVE-2011-0216)

    A flaw was found in the way libxml2 parsed certain XPath expressions. If an     attacker were able to supply a specially-crafted XML file to an application     using libxml2, as well as an XPath expression for that application to run     against the crafted file, it could cause the application to crash.
    (CVE-2011-2834)

    Note: Red Hat does not ship any applications that use libxml2 in a way that     would allow the CVE-2011-2834 flaw to be exploited; however, third-party     applications may allow XPath expressions to be passed which could trigger     this flaw.

    An out-of-bounds memory read flaw was found in libxml2. A remote attacker     could provide a specially-crafted XML file that, when opened in an     application linked against libxml2, would cause the application to crash.
    (CVE-2011-3905)

    All users of libxml2 are advised to upgrade to these updated packages,     which contain backported patches to correct these issues. The desktop must     be restarted (log out, then log back in) for this update to take effect.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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RHEL 4 : libxml2 (RHSA-2012:0016)

critical Nessus Plugin ID 57491

Version 1.23

Version 1.22

Version 1.23 Nov 5, 2024, 12:50 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Plugin metadata Plugin Feed: 202411051250
Version 1.22 Apr 27, 2024, 10:42 PM CVSS metrics ("CVSSv3 score" set to 9.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:O/RC:C") CVSSv2 score source (set to "CVE-2011-0216") CVSSv3 score source (set to "CVE-2011-3919") Detection (updated detection logic) Plugin metadata Reference Plugin Feed: 202404272242