-----BEGIN PGP SIGNED MESSAGE----- =============================================================================== Security Advisory CERT-NL =============================================================================== Author/Source : Gert Meijerink Index : S-97-73 Distribution : World Page : 1 Classification: External Version: 1 Subject : Vulnerabilities in Cisco CHAP Authentication Date : 26-Sep-97 =============================================================================== By courtesy of Cisco Systems and CERT Coordination Center we received the following information. CERT Coordination Center Vendor-Initiated Bulletin VB-97.00.cisco, reports vulnerabilities in Cisco CHAP Authentication The vulnerability permits attackers with appropriate skills and knowledge to completely circumvent CHAP authentication. This advisory provides information about workarounds and fixes. CERT-NL recommends to act on the information in the bulletin as soon as possible. All CERT Coordination Center advisories and bulletins are mirrored by CERT-NL. The specific URL for this case is: 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: 2.6.3i Charset: cp850 iQCVAwUBNDQIm0U5nQkWIq1FAQErNAP9GLDG5VxEeRHZUNO4/6rchjKlx9WGJc5U 2zw1Cfg6EqaaEN7f0/nTwiJHwAIdXo8qE3u8UQDlZ6kN1u2GSfh64QxH5KZXc88Z VCtVwG/6nr7CPWUkKeidHsZocOJB3TuakOCopca2xpzVWSI+qqETwB1y4coOw9fe GpsfJtdNSdE= =WMEa -----END PGP SIGNATURE-----