[UNIX] HP-UX stmkfont Local Privilege Escalation Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 10/25/04

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      HP-UX stmkfont Local Privilege Escalation Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    The stmkfont utility in HP-UX suffers from a vulnerability that may lead
    to privilege escalation with 'bin' group privileges.

    DETAILS

    Vulnerable Systems:
     * HP-UX B.11.00
     * HP-UX B.11.11
     * HP-UX B.11.22
     * HP-UX B.11.23

    Immune Systems:
     * HP-UX systems with patches PHSS_31990 - HP-UX B.11.23, PHSS_31989 -
    HP-UX B.11.22, PHSS_31988 - HP-UX B.11.11, PHSS_31987 - HP-UX B.11.00

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0965>
    CAN-2004-0965

    HP-UX stmkfont is installed sgid 'bin' bit by default. Stmkfont uses
    relative paths when executing external commands. Thus, local attackers
    could cause stmkfont to execute any specified external command by setting
    the PATH environment variable. Therefore, attackers could run arbitrary
    commands with the privileges of group 'bin'.

    Workaround
    As a temporary workaround, the stmkfont executable can be run without the
    sgid 'bin' bit. In order to disable it:
    # chmod a-s /usr/bin/stmkfont

    Vendor Status:
    The vendor (HP-UX) has released a security bulletin
    <http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX01088>
    http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX01088
    regarding this issue, along with patches for vulnerable OS versions.

    Note: A valid ITRC account is required for the link above.

    Patch IDs:
     * PHSS_31990 - HP-UX B.11.23
     * PHSS_31989 - HP-UX B.11.22
     * PHSS_31988 - HP-UX B.11.11
     * PHSS_31987 - HP-UX B.11.00

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:security@nsfocus.com>
    NSFOCUS Security Team.
    The original article can be found at:
    <http://www.nsfocus.com/english/homepage/research/0402.htm>
    http://www.nsfocus.com/english/homepage/research/0402.htm

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