Date: 06 Feb 1994 20:40:07 -0500 From: "Kenneth R. van Wyk" Subject: ASSIST Bulletin 94-02a To: ASSIST Bulletins Cc: Automated Systems Security Incident Support Team Content-transfer-encoding: 7BIT -----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 4,MIC-CLEAR Content-Domain: RFC822 Originator-Certificate: MIICqjCCAhMCARAwDQYJKoZIhvcNAQECBQAwgYYxC zAJBgNVBAYTAlVTMSswKQYDVQQKEyJEZWZlbnNlIEluZm9ybWF0aW9uIFN5c3Rlb XMgQWdlbmN5MTAwLgYDVQQLEydDZW50ZXIgZm9yIEluZm9ybWF0aW9uIFN5c3Rlb XMgU2VjdXJpdHkxGDAWBgNVBAsTD0NvdW50ZXJtZWFzdXJlczAeFw05MzEyMDkxM zAwNDRaFw05NTEyMDkxMzAwNDRaMIG4MQswCQYDVQQGEwJVUzErMCkGA1UEChMiR GVmZW5zZSBJbmZvcm1hdGlvbiBTeXN0ZW1zIEFnZW5jeTEwMC4GA1UECxMnQ2Vud GVyIGZvciBJbmZvcm1hdGlvbiBTeXN0ZW1zIFNlY3VyaXR5MRgwFgYDVQQLEw9Db 3VudGVybWVhc3VyZXMxEzARBgNVBAsTCk9wZXJhdGlvbnMxGzAZBgNVBAMTEktlb m5ldGggUi4gdmFuIFd5azCBmjAKBgRVCAEBAgIEAAOBiwAwgYcCgYEA87an/VaSD dGo6vyWxeuYagddw7CFtKmrgvExfmcie7QUd7Nd63b31AK6tBeu4LLTsaKXR8d9O yzu+MWQFPS0QkfAa501U3AhSGmdJK8I1sIyGHnIXtiDI6dWDR7d/kFfFCFi1Skbv b5wQzZzwSg5xGJgZLunVwtKkP2dxV8hC+cCAQMwDQYJKoZIhvcNAQECBQADgYEAG B808ZN0Egrl+/A7tXicIVtm9OEMsWVc+P36oh9Ql/IZHc0C5tt4ZrXyeWSXIKlnR cEIHkJqXlBs3/THCZzZqFCJG1rki7kxKNrmmqB2+/bnfK2ZUBjVnW3cHeoEnv/VI MaNWjcrdc+DQpP8pXojfTvxnTuawSOSvyhs13RUC0s= Issuer-Certificate: MIICNTCCAZ4CARswDQYJKoZIhvcNAQECBQAwRDELMAkGA 1UEBhMCVVMxCzAJBgNVBAgTAk1EMSgwJgYDVQQKEx9UcnVzdGVkIEluZm9ybWF0a W9uIFN5c3RlbXMgUENBMB4XDTkzMTExMDIxMjIxNloXDTk0MDIxODIxMjIxNlowg YYxCzAJBgNVBAYTAlVTMSswKQYDVQQKEyJEZWZlbnNlIEluZm9ybWF0aW9uIFN5c 3RlbXMgQWdlbmN5MTAwLgYDVQQLEydDZW50ZXIgZm9yIEluZm9ybWF0aW9uIFN5c 3RlbXMgU2VjdXJpdHkxGDAWBgNVBAsTD0NvdW50ZXJtZWFzdXJlczCBmjAKBgRVC AEBAgIEAAOBiwAwgYcCgYEA19l6BN7iTGYEU61qJETIjBh3iAeHzoL8sZ5KwFRZD S/a1KnYlD1zJHR/KeQCOBWW2HzX43TFLCNGU7UD9i6m8AymLe5IJf/bGh0Rne7Jd Q1GAOLw7/J4hE57IMbGETZpzeU1D9IYxiERRNio/oa422lUlS9JZHLA5jaPNcUrX P8CAQMwDQYJKoZIhvcNAQECBQADgYEAtk4EYPgH0//H896t95E+4m8zWRxwyAULr a5wWThZ1TNjwdDQ3HbYC2IhXUA2N2Vzic5SWBFI6BRmEjWQrrgUNi4a26zZc6jiS 3OebUYo75t1kkzyRaEf0o3DPnkvo0FQziUJaFpu6Z1/+ZoGu4UURwr/jaA+g1oZC 6kDyRnygWc= Issuer-Certificate: MIIB8jCCAVsCAQEwDQYJKoZIhvcNAQECBQAwRDELMAkGA 1UEBhMCVVMxCzAJBgNVBAgTAk1EMSgwJgYDVQQKEx9UcnVzdGVkIEluZm9ybWF0a W9uIFN5c3RlbXMgUENBMB4XDTkzMDUyODE3MTEyN1oXDTk1MDUyODE3MTEyN1owR DELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAk1EMSgwJgYDVQQKEx9UcnVzdGVkIEluZ m9ybWF0aW9uIFN5c3RlbXMgUENBMIGaMAoGBFUIAQECAgQAA4GLADCBhwKBgQDbL xaRlS3u54yyRgVDI5dcE9nlasL8fJqOGlyo7xH2FZnr3kUfsFj7OGiYsr6UbvqwK nyfMIRUrXDUa64leGmft3SK27psDUHOynRSCc40d/HrDf810U5tnTamBKUIMqivK 4GoL0tMRA1eX6hALAvLLgK1HbnwZAo6GqQGW8CIJQIBAzANBgkqhkiG9w0BAQIFA AOBgQDBp5aC6oV6IuFi8JCctq57bew604HHNllgjjp7zdXafq6jctRg2g91k/yFW h19bJC/tNrb0WVwuZOs5L/FToPMNIIHzaW/YSROBmyhTDYaKHZGj0P1+iNjMbHt9 dm1QEHGIfKgBwFidItnOa74DfkXdijlPRnr/+E2Ib6PM+hEfQ== MIC-Info: RSA-MD5,RSA,12IVU5m0J5RD0SYDKwJWVsF1R+CkurJ45KhrGRa8hhe aXrwQVMDgQdaP712uDhPgGTHikFVx1A5zlCqfUjghTbpVXUpgXvMjkyQgy3GB7n8 XPnDVVOMgqcCYP/rJhyixCF8RjgIeOT6CqHlbBsIEvDc8F7ANhOc0qroW6dU5uRk = <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Automated Systems Security Incident Support Team _____ ___ ___ _____ ___ _____ | / /\ / \ / \ | / \ | | / Integritas / \ \___ \___ | \___ | | < et /____\ \ \ | \ | | \ Celeritas / \ \___/ \___/ __|__ \___/ | |_____\ <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Bulletin 94-02A Release date: 6 February 1994, 8:30 PM EDT Subject: Addendum to Automated Systems Security Incident Support Team (ASSIST) bulletin 94-02, ASSIST 94-02A. To ensure expedient service to all personnel who need information and guidance to identify and correct problems associated with recent MILNET security events, the ASSIST response center (ARC) will be staffed on a 24 x 7 basis until further notice. The ARC can be reached at 703-756-7974, DSN 289. The current attacks involve a network monitoring tool that uses the promiscuous mode of a specific UNIX network interface, /dev/nit, to capture host and user authentication information on all newly opened FTP, telnet, and rlogin sessions. Immediate action required is: A. ** All users on systems that allow remote access must change passwords immediately ** B. In addition, systems that support the /dev/nit interface should disable this feature if it is not used or attempt to prevent unauthorized access if the feature is necessary. C. Determine if the network monitoring tool is running on your hosts that support a promiscuous network interface. (See ASSIST Bulletin 94-02.) *** Any site that detects this malicious code should contact ASSIST immediately. *** It is important to contact ASSIST before taking any further action. Any action taken by the administrator is likely to be tracked if the sniffer is in place. For immediate assistance in eradication, ASSIST can be reached 24 hours a day. ASSIST is an element of the Defense Information Systems Agency (DISA), Center for Information Systems Security (CISS), that provides service to the entire DoD community. If you have any questions about ASSIST or computer security issues, contact ASSIST using one of the methods listed below. If you would like to be included in the distribution list for these bulletins, send your Milnet (Internet) e-mail address to assist-request@assist.ims.disa.mil. Back issues of ASSIST bulletins are available on the ASSIST bbs (see below), and through anonymous ftp from assist.ims.disa.mil. Note: assist.ims.disa.mil accepts connections from Milnet addresses only. ASSIST contact information: PHONE: 703-756-7974, DSN 289, duty hours are 06:30 to 17:00 Monday through Friday. During off duty hours, weekends, and holidays, ASSIST can be reached via pager at 800-SKY-PAGE (800-759-7243) PIN 2133937. Your page will be answered within 30 minutes, however if a quicker response is required, prefix your phone number with "999" and ASSIST will return your call within 5 minutes. ELECTRONIC MAIL: assist@assist.ims.disa.mil. ASSIST BBS: 703-756-7993/4, DSN 289, leave a message for the "sysop". Privacy Enhanced Mail (PEM): ASSIST uses PEM, a public key encryption tool, to digitally sign all bulletins that are distributed through e-mail. The section of seemingly random characters between the "BEGIN PRIVACY-ENHANCED MESSAGE" and "BEGIN ASSIST BULLETIN" contains machine-readable digital signature information generated by PEM, not corrupted data. PEM software for UNIX systems is available from Trusted Information Systems (TIS) at no cost, and can be obtained via anonymous FTP from ftp.tis.com (IP 192.94.214.100). Note: The TIS software is just one of several implementations of PEM currently available and additional versions are likely to be offered from other sources in the near future. -----END PRIVACY-ENHANCED MESSAGE-----