[RHEL5] Tripwire detect tampering in symbolic link.

Solution Verified - Updated -

Issue

  • Customer uses Tripwire to monitor tampering. When he updated following packages, Tripwire detect some file tampers.

      updated package list:
        lm_sensors-2.10.7-9.el5.x86_64.rpm
        lm_sensors-devel-2.10.7-9.el5.i386.rpm
        lm_sensors-devel-2.10.7-9.el5.x86_64.rpm
        net-snmp-5.3.2.2-14.el5.x86_64.rpm
        net-snmp-devel-5.3.2.2-14.el5.i386.rpm
        net-snmp-devel-5.3.2.2-14.el5.x86_64.rpm
        net-snmp-libs-5.3.2.2-14.el5.i386.rpm
        net-snmp-libs-5.3.2.2-14.el5.x86_64.rpm
        net-snmp-perl-5.3.2.2-14.el5.x86_64.rpm
        net-snmp-utils-5.3.2.2-14.el5.x86_64.rpm
        libsysfs-2.1.0-1.el5.i386.rpm
        libsysfs-2.1.0-1.el5.x86_64.rpm
        libsysfs-devel-2.1.0-1.el5.i386.rpm
        libsysfs-devel-2.1.0-1.el5.x86_64.rpm
        lm_sensors-2.10.7-9.el5.i386.rpm
    
      detected file list:
        "/usr/bin/encode_keychange"
        "/usr/bin/get_module"
        "/usr/bin/hpijs"
        "/usr/bin/ipmi_ui"
        "/usr/bin/ipmish" --- symlink to "/usr/bin/openipmish"
        "/usr/bin/openipmish"
        "/usr/bin/sensors"
        "/usr/bin/snmpbulkget"
        "/usr/bin/snmpbulkwalk"
        "/usr/bin/snmpdelta"
        "/usr/bin/snmpdf"
        "/usr/bin/snmpget"
        "/usr/bin/snmpgetnext"
        "/usr/bin/snmpinform" --- symlink to "/usr/bin/snmptrap"
        "/usr/bin/snmpnetstat"
        "/usr/bin/snmpset"
        "/usr/bin/snmpstatus"
        "/usr/bin/snmptable"
        "/usr/bin/snmptest"
        "/usr/bin/snmptranslate"
        "/usr/bin/snmptrap"
        "/usr/bin/snmpusm"
        "/usr/bin/snmpvacm"
        "/usr/bin/snmpwalk"
        "/usr/bin/systool"
        "/usr/sbin/hpiod"
        "/usr/sbin/i2cdetect"
        "/usr/sbin/i2cdump"
        "/usr/sbin/i2cget"
        "/usr/sbin/i2cset"
        "/usr/sbin/isadump"
        "/usr/sbin/isaset"
        "/sbin/multipath"
        "/sbin/multipathd"
    
  • So, I have no idea what is happening in the Customer's system.

  • Do you have any idea what situation symbolic links are updated at i-node generation number only, not updated time-stamp.

Environment

  • Red Hat Enterprise Linux 5
  • net-snmp-libs-5.3.2.2-14.el5.x86_64
  • net-snmp-utils-5.3.2.2-14.el5.x86_64

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