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    Copyright
    Preface
    Introduction
    Pt. I. Linux Security Basics
    Pt. II. Linux User Security
    Pt. III. Linux Network Security
    Pt. IV. Linux Internet Security
    Pt. V. Appendixes
    Appx. A. Linux Security Command Reference
    .htaccess
    .htpasswd
    ACUA (An Add-On)
    amadmin
    amanda
    amcheck
    amcleanup
    amdump
    amrestore
    Angel Network Monitor (An Add-On)
    arp
    bootpd
    cfdisk
    Check-ps (An Add-On)
    checkXusers (An Add-On)
    chmod
    chown
    chroot
    CIPE Crypto IP Encapsulation (An Add-On)
    crypt
    ctrlaltdel
    Dante (An Add-On)
    Deception Toolkit (An Add-On)
    DOC (Domain Obscenity Control, an Add-On)
    dns_lint (An Add-On)
    dnswalk (An Add-On)
    Ethereal (An Add-On)
    exports
    exscan (An Add-On)
    FakeBO (An Add-On)
    fdisk
    finger
    fingerd
    ftphosts
    ftpaccess
    ftpd
    ftpshut
    GNU Privacy Guard (An Add-On)
    halt
    hosts_access
    hosts_options
    hosts.equiv
    HUNT (An Add-On)
    htpasswd
    httpd
    icmpinfo (An Add-On)
    identd
    IdentTCPscan (An Add-On)
    inetd.conf
    ip_filter (An Add-On)
    IPAC (An Add-On)
    ipfwadm
    ISS (An Add-On)
    KSniffer (An Add-On)
    last
    Logcheck from the Abacus Project (An Add-On)
    lsof (An Add-On)
    MAT (Monitoring and Administration Tool, an Add-On)
    MOM (An Add-On)
    msystem (An Add-On That's Made for UNIX But Can Work with Linux)
    NEPED (Network Promiscuous Ethernet Detector, an Add-On)
    Nessus (An Add-On)
    netstat
    Network Security Scanner (An Add-On)
    NIST Cerberus (An Add-On)
    nmap (The Network Mapper, an Add-On)
    npasswd (An Add-On)
    ntop (An Add-On)
    passwd
    passwd+ (An Add-On)
    pgp4pine
    ping
    ps
    qmail (An Add-On)
    QueSo (An Add-On)
    rcmd
    rcp
    reboot
    rlogin
    rhosts
    rhosts.dodgy (An Add-On)
    rsh
    scp
    Sentry from the Abacus Project
    services
    shadow
    Shadow in a Box (An Add-On)
    showmount
    shutdown
    SINUS (An Add-On)
    SocketScript (An Add-On)
    ssh
    ssh-add
    ssh-agent
    ssh-keygen
    sshd
    SSLeay
    Strobe (An Add-On)
    sudo
    Swan (An Add-On)
    swatch (The System Watcher)
    sXid Secure (An Add-On)
    sysklogd
    System Administrator's Tool for Analyzing Networks (SATAN, an Add-On)
    tcpd (TCP WRAPPER)
    tcpdchk
    tcpdmatch
    tcpdump
    tftp
    The Linux Shadow Password Suite (An Add-On)
    traceroute
    traffic-vis (An Add-On)
    Trinux (An Add-On)
    TripWire(An Add-On)
    trojan.pl
    ttysnoop
    vipw
    visudo
    w
    who
    whois
    Xlogmaster (An Add-On)
    Appx. B. Linux Security Index—Past Linux Security Issues
    Appx. C. Other Useful Linux Security Tools
    Appx. D. Sources for More Information
    Appx. E. Glossary
    Index
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    Part V: Appendixes > sXid Secure (An Add-On)

    sXid Secure (An Add-On)

    Description: sXid Secure tracks SUID and SGID files.

    Security Relevance: SUID and SGID-bit files are special. They carry their owner's permissions rather than the permissions of the user executing them. If attackers can exploit SUID or SGID files, they can potentially gain root access. For this reason, you should closely watch these files for changes. sXid does this automatically. Learn more in Chapter 6, "Malicious Code."


      

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