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CVE details

CVE-2023-5574

A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.

Score
7.0 high
Published
2023-10-25
Links
NVD · cve.org

Matched ports (4)

PortPackageVersionStatusMaintainer
x11-servers/xorg-serverxephyr21.1.25,1unaddressedx11@FreeBSD.org
x11-servers/xorg-serverxorg-nestserver21.1.25,2unaddressedx11@FreeBSD.org
x11-servers/xorg-serverxorg-server21.1.25,1unaddressedx11@FreeBSD.org
x11-servers/xorg-serverxorg-vfbserver21.1.25,1unaddressedx11@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>xephyr</name>
	<range><lt>FIXME</lt></range>
      </package>
      <package>
	<name>xorg-nestserver</name>
	<range><lt>FIXME</lt></range>
      </package>
      <package>
	<name>xorg-server</name>
	<range><lt>FIXME</lt></range>
      </package>
      <package>
	<name>xorg-vfbserver</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue
	occurs in Xvfb with a very specific and legacy configuration (a
	multi-screen setup with multiple protocol screens, also known as
	Zaphod mode). If the pointer is warped from a screen 1 to a screen 0,
	a use-after-free issue may be triggered during shutdown or reset of
	the Xvfb server, allowing for possible escalation of privileges or
	denial of service.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2023-5574</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2023-5574</url>
    </references>
    <dates>
      <discovery>2023-10-25</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>