CVE-2009-0021 Information

Description

NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys a similar vulnerability to CVE-2008-5077.

Reference

http://lists.apple.com/archives/security-announce/2009/May/msg00002.html http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html http://secunia.com/advisories/33406 http://secunia.com/advisories/33558 http://secunia.com/advisories/33648 http://secunia.com/advisories/34642 http://secunia.com/advisories/35074 http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.531177 http://support.apple.com/kb/HT3549 http://www.ocert.org/advisories/ocert-2008-016.html http://www.redhat.com/support/errata/RHSA-2009-0046.html http://www.securityfocus.com/archive/1/499827/100/0/threaded http://www.securitytracker.com/id?1021533 http://www.us-cert.gov/cas/techalerts/TA09-133A.html http://www.vupen.com/english/advisories/2009/0042 http://www.vupen.com/english/advisories/2009/1297 https://lists.ntp.org/pipermail/announce/2009-January/000055.html https://oval.cisecurity.org/repository/search/definition/oval3Aorg.mitre.oval3Adef3A10035