{"document":{"acknowledgments":[{"urls":["https://kb.cert.org/vuls/id/774587#acknowledgements"]}],"category":"CERT/CC Vulnerability Note","csaf_version":"2.0","notes":[{"category":"summary","text":"A vulnerability exists in the Telnet Authentication Option and Telnet Data Encryption Option specifications. An ordered list of authentication and encryption options sent from the server to client during negotiation is not cryptographically protected. As a result, an attacker may be able to modify the list and cause less secure authentication and encryption options to be negotiated. An active attacker may be able to disable Telnet data encryption without the client's knowledge.","title":"Summary"},{"category":"legal_disclaimer","text":"THIS DOCUMENT IS PROVIDED ON AN 'AS IS' BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. ","title":"Legal Disclaimer"},{"category":"other","text":"CERT/CC Vulnerability Note is a limited advisory. It primarily identifies vendors impacted by the advisory and not specific products. We only support \"known_affected\" and \"known_not_affected\" status. Please consult the vendor's statements and advisory URL if provided by the vendor for more details ","title":"Limitations of Advisory"}],"publisher":{"category":"coordinator","contact_details":"Email: cert@cert.org, Phone: +1412 268 5800","issuing_authority":"CERT/CC under DHS/CISA https://www.cisa.gov/cybersecurity also see https://kb.cert.org/ ","name":"CERT/CC","namespace":"https://kb.cert.org/"},"references":[{"url":"https://certcc.github.io/certcc_disclosure_policy","summary":"CERT/CC vulnerability disclosure policy"},{"summary":"CERT/CC document released","category":"self","url":"https://kb.cert.org/vuls/id/774587"}],"title":"Kerberos Telnet protocol does not adequately protect authentication and encryption options","tracking":{"current_release_date":"2002-02-25T21:49:28+00:00","generator":{"engine":{"name":"VINCE","version":"3.0.35"}},"id":"VU#774587","initial_release_date":"2001-09-12 00:00:00+00:00","revision_history":[{"date":"2002-02-25T21:49:28+00:00","number":"1.20020225214928.49","summary":"Released on 2002-02-25T21:49:28+00:00"}],"status":"final","version":"1.20020225214928.49"}},"vulnerabilities":[{"notes":[{"category":"general","text":"No vulnerabilities have been defined at this time for this report"}]}]}