-----BEGIN PGP SIGNED MESSAGE----- =============================================================================== Security Advisory CERT-NL =============================================================================== Author/Source : Don Stikvoort Index : S-97-90 Distribution : World Page : 1 Classification: External Version: 1 Subject : IP Denial-of-Service Attacks Date : 17-Dec-97 =============================================================================== By courtesy of CERT Coordination Center we received the following information. CERT Coordination Center advisory CA-97.28 reports two exploits of TCP/IP vulnerabilities, exploits named "Land" and "Teardrop". These vulnerabilities allow a remote user to cause a denial of service (onto crashes). This advisory provides vendor patch information and a workaround, the latter for Land only. CERT-NL recommends taking immediate steps. All CERT Coordination Center advisories are mirrored by CERT-NL. The specific URL for this case is: ADVISORIES ARE REGULARLY UPDATED BY CERT COORDINATION CENTER. Therefore we advise you to check on our mirror regularly - you can automate this process using the CERT-NL notifier service. More information about the CERT-NL mirror and notifier services is contained in News items N-95-01 (notifier) and N-95-02 (CERT mirror), both present on ============================================================================== CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet is the Dutch network for educational, research and related institutes. CERT-NL is a member of the Forum of Incident Response and Security Teams (FIRST). All CERT-NL material is available under: http://www.surfnet.nl/surfnet/security/cert-nl.html ftp://ftp.surfnet.nl/surfnet/net-security In case of computer or network security problems please contact your local CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer please address the appropriate (local) CERT/security-team). CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer, i.e. UTC+0100 in winter and UTC+0200 in summer (DST). Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS Phone: +31 302 305 305 BUSINESS HOURS ONLY Fax: +31 302 305 329 BUSINESS HOURS ONLY Snailmail: SURFnet bv Attn. CERT-NL P.O. Box 19035 NL - 3501 DA UTRECHT The Netherlands NOODGEVALLEN: 06 52 87 92 82 ALTIJD BEREIKBAAR EMERGENCIES : +31 6 52 87 92 82 ATTENDED AT ALL TIMES CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES: THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED* PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU. ============================================================================== -----BEGIN PGP SIGNATURE----- Version: 2.6.2i iQCVAwUBNJf23UU5nQkWIq1FAQE50wP/bam/h5jVe5R7G3fGhkW/+YIFWzdWpA05 /89QMG6qmenc7A4iAkKwQFVLPGdTeSnzKLrOf4sZBAtHsm6l1qqxZWbU4QkuOJid bGwXj6amhhamNdJzQRYfq1pc+XF0eggtIbMI0Rv3+d4behaCQ3cjlXDNy5N3+OwP 2ZgAVQnzwkc= =5mln -----END PGP SIGNATURE-----