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Files from Craig H. Rowland

common.attacks.html

Posted Aug 17, 1999

Authored by Craig H. Rowland

Common System Intrusion Methods - An excellent whitepaper that describes the most common methods for gaining access to a target host.

tags | paper

SHA-256 | f27379be90c80dafb4ccdd9b57f448f86823834e4f56aab2b4c7dee63c469c93

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hostsentry-0.02.tar.gz

Posted Aug 17, 1999

Authored by Craig H. Rowland

HostSentry v0.02 is a host based intrusion detection tool that performs Login Anomaly Detection (LAD), and is the most recent edition to the Abacus Project suite of security tools. This tool allows administrators to spot strange login behavior and quickly respond to compromised accounts and unusual behavior. HostSentry incorporates a dynamic database and actually "learns" the user login behavior. This behavior is then utilized by modular signatures to detect unusual events. Specifically, HostSentry monitors system login accounting records in real-time (wtmp/utmp). These records are used to build a dynamic database of active users and run a series of signature modules during the login and logout phases. The signature modules are pluggable and easily activated or deactivated by the admin. An example wrapper is included to allow administrators to add new signatures. The current list of signatures includes: moduleLoginLogout - Generic audit trail of all user login and logouts. moduleFirstLogin - Alerts administrators if this user is logging in for the first time. moduleForeignDomain - A login was detected from a domain not listed in the allowed domains file. moduleRhostCheck - A user's .rhosts file contains a wildcard or other dangerous modification. moduleHistoryTruncated - A user's .history file is missing, truncated to zero bytes, or symlinked (i.e. /dev/null). moduleOddDirnames - A user's directory contains suspicious directory names on logout (" ..", "...", etc.). moduleMultipleLogins - A single username has multiple concurrent logins from different domains. moduleOddLoginTime - A user is logging in at an odd hour for their usage pattern (not implemented yet). moduleInvalidUtmp - A corresponding utmp/wtmp entry for this login cannot be found (entry possibly removed) (not implemented yet). moduleHistorySuspicious - The user's history file contains suspicious commands (not implemented yet). moduleNetworkDaemon - The user logged out but left a listening network socket operating (private web server, IRC bot, etc.) (not implemented yet). moduleFileExists - A file was found in the user's directory that is listed in the banned/monitored list of the site (not implemented yet). First release.

tags | tool, web, intrusion detection

systems | unix

SHA-256 | ae72db926a73b826617e8d2836f0f1b35c6cebaf43eaaa07ed9605e3111f9a81

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portsentry-0.61.tar.gz

Posted Aug 17, 1999

Authored by Craig H. Rowland

PortSentry v0.61beta is part of the Abacus Project suite of security tools. It is a program designed to detect and respond to port scans against a target host in real-time. There are other port scan detectors that perform similar detection of scans, but PortSentry has some unique features that may make it worth looking into: Runs on TCP and UDP sockets to detect port scans against your system. PortSentry is configurable to run on multiple sockets at the same time so you only need to start one copy to cover dozens of tripwired services. Stealth scan detection (Linux only right now). PortSentry will now detect SYN/half-open, FIN, NULL, X-MAS and oddball packet stealth scans. Four new stealth scan operation modes have been added to greatly increase the power of this package. PortSentry will react to a port scan attempt by blocking the host in real-time. This is done through configured options of either dropping the local route back to the attacker, using the Linux ipfwadm command, *BSD ipfw command, and/or dropping the attacker host IP into a TCP Wrappers host.deny file automatically. PortSentry has an internal state engine to remember hosts that connected previously. This allows the setting of a trigger value to prevent false alarms and detect "random" port probing. PortSentry will report all violations to the local or remote syslog daemons indicating the system name, time of attack, attacking host IP and the TCP or UDP port a connection attempt was made to. When used in conjunction with Logcheck it will provide an alert to administrators through e-mail.

tags | tool, remote, local, udp, tcp, intrusion detection

systems | linux, unix, bsd

SHA-256 | e6abb4bb6fe8c257109cb82ce43a8d90cb603dc5684b1db877a5fc4f574724f2

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