Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I don't know if this appropriate here, but I know a lot of perl monks are penguin lovers also. I was forwarded this PGP signed message from my LUG. It was sent to one of the sysadmins at the university i attend:
Hash: SHA1
March 23, 2001 7:00 AM
Late last night, the SANS Institute (through its Global Incident
Analysis Center) uncovered a dangerous new worm that appears to be spreading rapidly across the Internet. It scans the Internet looking for Linux computers with a known vulnerability. It infects the vulnerable machines, steals the password file (sending it to a site), installs other hacking tools, and forces the newly infected machine to begin scanning the Internet looking for other victims.
Several experts from the security community worked through the night to decompose the worm's code and engineer a utility to help you discover if the Lion worm has affected your organization.
Updates to this announcement will be posted at the SANS web site,
The Lion worm is similar to the Ramen worm. However, this worm is significantly more dangerous and should be taken very seriously. It infects Linux machines running the BIND DNS server. It is known to infect bind version(s) 8.2, 8.2-P1, 8.2.1, 8.2.2-Px, and all 8.2.3-betas. The specific vulnerability used by the worm to exploit machines is the TSIG vulnerability that was reported on January 29, 2001.
The Lion worm spreads via an application called "randb". Randb scans random class B networks probing TCP port 53. Once it hits a system, it checks to see if it is vulnerable. If so, Lion exploits the system using an exploit called "name". It then installs the t0rn rootkit.
Once Lion has compromised a system, it:
- - Sends the contents of /etc/passwd, /etc/shadow, as well as some network settings to an address in the domain.
- - Deletes /etc/hosts.deny, eliminating the host-based perimeter protection afforded by tcp wrappers.
- - Installs backdoor root shells on ports 60008/tcp and 33567/tcp (via inetd, see /etc/inetd.conf)
- - Installs a trojaned version of ssh that listens on 33568/tcp
- - Kills Syslogd , so the logging on the system can't be trusted
- - Installs a trojaned version of login
- - Looks for a hashed password in /etc/ttyhash
- - /usr/sbin/nscd (the optional Name Service Caching daemon) is overwritten with a trojaned version of ssh.
The t0rn rootkit replaces several binaries on the system in order to stealth itself. Here are the binaries that it replaces:
du, find, ifconfig, in.telnetd, in.fingerd, login, ls, mjy, netstat, ps, pstree, top
- - "Mjy" is a utility for cleaning out log entries, and is placed in /bin and /usr/man/man1/man1/lib/.lib/.
- - in.telnetd is also placed in these directories; its use is not known at this time.
- - A setuid shell is placed in /usr/man/man1/man1/lib/.lib/.x
We have developed a utility called Lionfind that will detect the Lion files on an infected system. Simply download it, uncompress it, and run lionfind. This utility will list which of the suspect files is on the system.
At this time, Lionfind is not able to remove the virus from the system. If and when an updated version becomes available (and we expect to provide one), an announcement will be made at this site.
Download Lionfind at
Further information can be found at:, CERT Advisory CA-2001-02, Multiple Vulnerabilities in BIND ISC BIND 8 contains buffer overflow
in transaction signature (TSIG) handling code Information about the t0rn rootkit.
The following vendor update pages may help you in fixing the original BIND vulnerability:
Redhat Linux RHSA-2001:007-03 - Bind remote exploit
Debian GNU/Linux DSA-026-1 BIND
SuSE Linux SuSE-SA:2001:03 - Bind 8 remote root compromise. txt.txt
Caldera Linux CSSA-2001-008.0 Bind buffer overflow
This security advisory was prepared by Matt Fearnow of the SANS Institute and William Stearns of the Dartmouth Institute for Security Technology Studies.
The Lionfind utility was written by William Stearns. William is an Open-Source developer, enthusiast, and advocate from Vermont, USA. His day job at the Institute for Security Technology Studies at Dartmouth College pays him to work on network security and Linux projects.
Also contributing efforts go to Dave Dittrich from the University of Washington, and Greg Shipley of Neohapsis
Matt Fearnow
SANS GIAC Incident Handler
If you have additional data on this worm or a critical quetsion please email
Version: GnuPG v1.0.4 (BSD/OS)
Comment: For info see

In reply to Stay aware of security/ Attention Linux perl monks by scottstef
in thread Stay aware of security by tilly

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others drinking their drinks and smoking their pipes about the Monastery: (8)
    As of 2015-11-29 16:00 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (751 votes), past polls