{"document":{"acknowledgments":[{"urls":["https://kb.cert.org/vuls/id/747124#acknowledgements"]}],"category":"CERT/CC Vulnerability Note","csaf_version":"2.0","notes":[{"category":"summary","text":"Additional Decryption Keys (ADKs) is a feature introduced into PGP (Pretty Good Privacy) versions 5.5.x through 6.5.3 that allows authorized extra decryption keys to be added to a user's public key certificate. However, an implementation flaw in PGP allows unsigned ADKs which have been maliciously added to a certificate to be used for encryption. Data encrypted with PGP 5.5.x through 6.5.3 using a modified certificate will generate ciphertext encrypted with the ADK subject to the conditions list in the impact section. The attacker who modified the certificate can obtain the plaintext from this ciphertext. PGP does not correctly detect this form of certificate modification because it fails to check if the ADK is stored in the signed (hashed) portion of the public certificate. As a result, normal methods for evaluating the legitimacy of a public certificate (fingerprint verification) are not sufficient for users of vulnerable versions of PGP.","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/747124"}],"title":"ADK flaw in recent versions of PGP","tracking":{"current_release_date":"2000-11-29T16:45:19+00:00","generator":{"engine":{"name":"VINCE","version":"3.0.35"}},"id":"VU#747124","initial_release_date":"2000-08-24 00:00:00+00:00","revision_history":[{"date":"2000-11-29T16:45:19+00:00","number":"1.20001129164519.22","summary":"Released on 2000-11-29T16:45:19+00:00"}],"status":"final","version":"1.20001129164519.22"}},"vulnerabilities":[{"notes":[{"category":"general","text":"No vulnerabilities have been defined at this time for this report"}]}]}