PRIOn knowledge basePRION:CVE-2009-0021Input validation
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.
References
lists.apple.com/archives/security-announce/2009/May/msg00002.html
lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html
lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html
secunia.com/advisories/33406
secunia.com/advisories/33558
secunia.com/advisories/33648
secunia.com/advisories/34642
secunia.com/advisories/35074
slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.531177
support.apple.com/kb/HT3549
www.ocert.org/advisories/ocert-2008-016.html
www.redhat.com/support/errata/RHSA-2009-0046.html
www.securityfocus.com/archive/1/499827/100/0/threaded
www.securitytracker.com/id?1021533
www.us-cert.gov/cas/techalerts/TA09-133A.html
www.vupen.com/english/advisories/2009/0042
www.vupen.com/english/advisories/2009/1297
lists.ntp.org/pipermail/announce/2009-January/000055.html
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035
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