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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Copyright 2001 Internet Security Systems (trademark) THE POWER TO PROTECT INTERNET THREAT & SOLUTIONS UPDATE for Oct 31st - Nov 2nd, 2001 ISS X-Force Special Operations Group - ---------------------------------------- CURRENT THREAT ASSESSMENT & THREAT FORECAST - ---------------------------------------- AlertCon 2 Today, Oct 31st, 2001 AlertCon 2 For Nov 1st-Nov 2nd, 2001 ************* - - We are at AlertCon 2 (increased vigilance) because of a combination of potential threats you need to be aware of and possibly do something about. We are projecting this AlertCon out through mid-day on Friday. - - There is some significant SSH vulnerabilities and associated exploits which are the subject of an X-Force alert (see below). - - The new Nimda-E variant appears to have stimulated a noticeable rise in Nimda assaults. Since Monday, the number of alarms has gone from an average of 500 per hour to an average of 1,500 per hour on our monitored networks. A large amount of the Nimda hits we're seeing are contained inside the 63 and 64 Class A netblocks. Since Nimda tends to propagate within the networks it successfully invades this concentration comes as no surprise. Unfortunately the corporations in this space share it with a large number of home users connected via DSL or cable modem who traditionally will be lax in updating OS, applying patches, and keeping antivirus software up to date. These are the machines that form the unfortunately large core of infected devices that give the rest of us so much trouble from the effects of malicious code. - ------------------------------------- SOLUTIONS - ------------------------------------- - - SSH vulnerabilities and exploitation. - -- Review the ISS X-Force advisory <http://xforce.iss.net/alerts/advise100.php> for information regarding the exploitation of SSH CRC32 and the Cisco write-up on the original vulnerability <http://www.cisco.com/warp/public/707/SSH-multiple-pub.html>. - -- Verify the patches have been applied to your implementation of SSH and consider limiting port access to just those IP addresses using SSH to support your business requirements. - -- Here are some additional advisories posted for the SSH vulnerabilities: - -- Remote vulnerabilities in OpenSSH <http://linuxtoday.com/news_story.php3?ltsn=2001-10-25-001-20-SC> - -- SSH Secure Shell Authentication Bypass Vulnerability <http://xforce.iss.net/alerts/advise88.php> - -- OpenSSH - Possible to determine password length <http://www.trustix.org/pipermail/tsl-announce/2001-March/000002.html> - - Nimda-E Worm. This worm seeks the same vulnerabilities as earlier versions of Nimda worm so those devices with the IIS patch installed will not be affected. Since the numbers of alarms has risen so dramatically since this new variant was first seen in the wild, it is clear that there is still a lot of patching to do. - -- Those relying on anti-virus solutions will need to pay attention since the strings have changed and until your vendor catches up you may be vulnerable. - -- Far better to install the IIS and other relevant Microsoft patches discussed in MS00-060, MS00-078, and MS01-020. - -- Patch your Win 2K and NT machines from these links: - --- Win 2K <http://www.microsoft.com/windows2000/downloads/critical/q300972/defaul t.asp?FinishURL=%2Fdownloads%2Frelease%2Easp%3FReleaseID%3D30800%26redi rect%3Dno> - --- Win NT <http://www.microsoft.com/ntserver/nts/downloads/critical/q300972/defau lt.asp?FinishURL=%2Fdownloads%2Frelease%2Easp%3FReleaseID%3D30833%26red irect%3Dno> - --- Make sure Outlook is patched (MSO 01-020) and to ensure that you have updated your IE Browser to ensure you're running IE 5.01 SP2, IE 5.5 SP2, or IE 6.0 to be sure you're not vulnerable, or apply the MS01-027 patch (which supercedes MS01-020). - ------------------------------------- Attack Signature Ranking - global IDS, midnight - midnight, previous day, % of total - ------------------------------------- Unauth Access Attempt 43.27% Protocol Decode 28.23% Suspicious Activity 19.89% Denial Of Service 06.47% Pre-Attack Probe 02.12% Back Door 00.02% - ------------------------------------- Top Ten Attack Destination Ports - global IDS, midnight - midnight, previous day, % of top ten (ports found at <http://www.iana.org/assignments/port-numbers> - ------------------------------------- 80 (http) 92.73% 25 (smtp) 02.53% 21 (ftp) 01.62% 513 (login) 01.04% 22 (ssh) 01.00% 6723 (unassigned) 00.34% 443 (https) 00.25% 15104 (unassigned) 00.18% 12754 (unassigned) 00.15% 123 (ntp) 00.14% - --------------------------------------- VIRUS, TOP 10 and NEW VULNERABILITIES, NEWS UPDATES - --------------------------------------- - - Visit <http://www.iss.net> under 'Global Internet Threat Intelligence Service' - - According to Sophos <http://www.sophos.com/virusinfo/topten/> the top ten viruses in September 2001 were: 1. Nimda-A 71.2% 2. Sircam-A 11.4% 3. Magistr-A 03.7% 4. Magistr-B 03.0% 5. Hybris-B 01.5% 6. Apology-B 00.7% 7. VBS/Kakworm 00.7% 8. Floss 00.7% 9. Bymer-A 00.5% 10. Badtrans-A 00.4% - --------------------------------------- Defacement Watch based on www.alldas.de <http://www.alldas.de> - --------------------------------------- - - Their stats show that since April, 2000, the most defaced OS is Windows, with a total of 15,612 defacements reported to Alldas.de, for 63% of the total. Although growing in popularity as a target, Linux is a distant second with 4396 defacements reported for 17% of the total. - - Alldas.de reports a total of 58 sites defaced yesterday. Details can be seen at <http://www.alldas.de> under 'current month'. A review of the 58 mirrors shows three with anti-war statements. Three other mirrors showed mild anti-U.S. sentiments. Two mirrors contained hacker propaganda messages and there was one mirror with an anti-terrorism comment. The remaining 49 were of the juvenile hacker, politically neutral variety. As usual, the defaced sites seemed unrelated to the defacement message content; they had the vulnerability du jour and were therefore targets of opportunity. - --------------------------------------- NOTES, COPYRIGHT NOTICE, and DISCLAIMER - --------------------------------------- NOTE 1: Our web site has this information in more attractive format and graphics available to the public at no cost at www.iss.net <http://www.iss.net> under 'Global Internet Threat Intelligence Service' <https://gtoc.iss.net/secure/whatshot.php> Screen captures (Control/PrtSc) of the site's pages dropped into PowerPoint can be an effective way to communicate various aspects of the Internet threat, e.g. the graph depicting 'AlertCon Trends' <https://gtoc.iss.net/secure/graph.html> NOTE 2: We provide this information on Internet threat metrics, viruses, vulnerabilities, patches, and breaking news, in the spirit of PDD 63, to help security professionals wage the war against Internet threats more effectively. Information in this update derived primarily from global, real time, 24 x 7 IDS feeds, ISS X-Force R&D Team research, and professional liaison. Other sources as noted. AlertCon 1 reflects the global, malicious, determined, 24 x 7 attacks experienced by all networks. AlertCon 2 means increased vigilance/action recommended due to a specific threat or concern. AlertCon 3 means increased attacks against specific targets or vulnerabilities on a scale that is unusually high, action required. AlertCon 4 reflects an Internet emergency for a target or group of targets whose business continuity may depend on some sort of immediate, decisive action. All summaries cover 24 hours the previous workday, GMT. Monday summaries may cover some weekend activity. Copyright 2001 Internet Security Systems, Inc. Permission is granted for the redistribution of the Internet Threat Update electronically. It is not to be sold or edited in any way without express consent of ISS. Refer comments or questions to [EMAIL PROTECTED] mailto: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Disclaimer: This information is subject to change without notice. Use of this information constitutes acceptance for use in an 'as is' condition. There are no warranties with regard to this information. In no event shall the author be liable for any damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk. No other use authorized. FOIA Exemption 4. Dennis Dennis Treece Director, Global MSS Special Operations Group Internet Security Systems (ISS) 6303 Barfield Road Atlanta, Georgia 30328 404-236-4065 -----BEGIN PGP SIGNATURE----- Version: PGP 6.5 iQA/AwUBO+Aw2+OOe/7N9KJeEQIWtgCg11fkW4fzx8gazMXbSoEUMWvmq68AoJzZ Lb9WbjbwEUaYdZ1A9skCCXHo =/Y0T -----END PGP SIGNATURE-----
