{"document":{"acknowledgments":[{"urls":["https://kb.cert.org/vuls/id/303080#acknowledgements"]}],"category":"CERT/CC Vulnerability Note","csaf_version":"2.0","notes":[{"category":"summary","text":"WinVNC's challenge/response mechanism can allow an intruder to obtain legitimate credentials from a valid client in order to gain unauthorized access to the server.","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/303080"}],"title":"AT&T WinVNC client authentication process vulnerable to man-in-the-middle attack","tracking":{"current_release_date":"2001-06-18T23:41:48+00:00","generator":{"engine":{"name":"VINCE","version":"3.0.35"}},"id":"VU#303080","initial_release_date":"2001-01-23 00:00:00+00:00","revision_history":[{"date":"2001-06-18T23:41:48+00:00","number":"1.20010618234148.34","summary":"Released on 2001-06-18T23:41:48+00:00"}],"status":"final","version":"1.20010618234148.34"}},"vulnerabilities":[{"notes":[{"category":"general","text":"No vulnerabilities have been defined at this time for this report"}]}]}