{"vuid":"VU#229595","idnumber":"229595","name":"Overly large OPT record assertion","keywords":["BIND","DNS","OPT"],"overview":"A remotely exploitable denial-of-service vulnerability exists in BIND. Based on recent reports, we believe this vulnerability is being actively exploited.","clean_desc":"A remotely exploitable denial-of-service vulnerability exists in BIND 8.3.0 - 8.3.3. ISC's description of this vulnerability states: When constucting [sic] a response a NXDOMAIN response to a ENDS query with a large UDP size it is possible to trigger an assertion.","impact":"The BIND daemon will shut down. As a result, clients will not be able to connect to the service to resolve queries.","resolution":"Apply a patch from your vendor. In the absence of a patch, you may wish to consider ISC's recommendation, which is upgrading to \"BIND 4.9.11, BIND 8.2.7, BIND 8.3.4 or preferably BIND 9.\" Additionally, ISC indicates, \"BIND 4 is officially deprecated. Only security fixes will be issued for BIND 4.\"","workarounds":"Disable recursion if possible.","sysaffected":"","thanks":"Internet Security Systems\n is credited for discovering this vulnerability.","author":"This document was written by Ian A Finlay.","public":["http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21469","http://www.isc.org/products/BIND/bind-security.html","http://www.ciac.org/ciac/bulletins/n-013.shtml"],"cveids":["CVE-2002-1220"],"certadvisory":"CA-2002-31","uscerttechnicalalert":null,"datecreated":"2002-11-12T03:56:12Z","publicdate":"2002-11-12T00:00:00Z","datefirstpublished":"2002-11-13T20:53:52Z","dateupdated":"2003-05-30T17:06:45Z","revision":27,"vrda_d1_directreport":"","vrda_d1_population":"","vrda_d1_impact":"","cam_widelyknown":"15","cam_exploitation":"0","cam_internetinfrastructure":"19","cam_population":"20","cam_impact":"8","cam_easeofexploitation":"18","cam_attackeraccessrequired":"18","cam_scorecurrent":"33.048","cam_scorecurrentwidelyknown":"37.908","cam_scorecurrentwidelyknownexploited":"57.348","ipprotocol":"","cvss_accessvector":"","cvss_accesscomplexity":"","cvss_authentication":null,"cvss_confidentialityimpact":"","cvss_integrityimpact":"","cvss_availabilityimpact":"","cvss_exploitablity":null,"cvss_remediationlevel":"","cvss_reportconfidence":"","cvss_collateraldamagepotential":"","cvss_targetdistribution":"","cvss_securityrequirementscr":"","cvss_securityrequirementsir":"","cvss_securityrequirementsar":"","cvss_basescore":"","cvss_basevector":"","cvss_temporalscore":"","cvss_environmentalscore":"","cvss_environmentalvector":"","metric":33.048,"vulnote":null}