{"schemaVersion":3,"id":"MGASA-2017-0420","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Updated krb5 packages fix security vulnerabilities\n\nAn authentication bypass flaw was found in the way krb5's certauth\ninterface handled the validation of client certificates. A remote\nattacker able to communicate with the KDC could potentially use this\nflaw to impersonate arbitrary principals under rare and erroneous\ncircumstances (CVE-2017-7562).\nNote that this issue only affects Mageia 6.\n\nRFC 2744 permits a GSS-API implementation to delete an existing security\ncontext on a second or subsequent call to gss_init_sec_context() or\ngss_accept_sec_context() if the call results in an error.  This API\nbehavior has been found to be dangerous, leading to the possibility of\nmemory errors in some callers.  For safety, GSS-API implementations\nshould instead preserve existing security contexts on error until the\ncaller deletes them (CVE-2017-11462).\n\nA buffer overflow vulnerability was found in get_matching_data()\nfunction when both the CA cert and the user cert have a long subject\naffecting krb5 that includes certauth plugin. Attack requires a\nvalidated certificate with a long subject and issuer, and a\n\"pkinit_cert_match\" string attribute on some principal in the database.\nA remote code execution exploit might also require that the attacker\ngets to choose the contents of the issuer in the validated cert\n(CVE-2017-15088).","dates":{"published":"2017-11-20T21:18:02.000Z","modified":"2026-04-16T06:23:47.043Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"mageia","product":"krb5","name":"krb5","label":"krb5","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/krb5","purlType":"rpm","versions":[{"text":"< 1.12.5-1.3.mga5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.12.5-1.3.mga5","eol":null,"hubHref":null},{"vendor":"mageia","product":"krb5","name":"krb5","label":"krb5","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/krb5","purlType":"rpm","versions":[{"text":"< 1.15.1-2.2.mga6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.15.1-2.2.mga6","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://advisories.mageia.org/MGASA-2017-0420.html","label":"advisories.mageia.org/MGASA-2017-0420.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=21628","label":"bugs.mageia.org/show_bug.cgi?id=21628","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/2XIPFDWKYB3HQKSWLVJ6AAPFEG6BEPE3/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["WEB"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/2FPRUP4YVOEBGEROUYWZFEQ64HTMGNED/","label":"lists.fedoraproject.org/archives/…","hostname":"lists.fedoraproject.org","tags":["WEB"]},{"url":"https://lists.opensuse.org/opensuse-updates/2017-11/msg00039.html","label":"lists.opensuse.org/opensuse-updates/2017-11/msg00039.html","hostname":"lists.opensuse.org","tags":["WEB"]}],"lineage":{"upstream":["CVE-2017-11462","CVE-2017-15088","CVE-2017-7562"],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2017-11-20T21:18:02.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-16T06:23:47.043Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:10:43.753Z","stale":false,"partial":false}}