CVE-2009-0021

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    CVE-2009-0021

    Published: 7 Jan 2009Last Modified: 10 Apr 2026

    Summary:

    Details: 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: 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://www.ocert.org/advisories/ocert-2008-016.html, http://www.vupen.com/english/advisories/2009/0042, http://www.vupen.com/english/advisories/2009/1297, 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://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.531177, http://support.apple.com/kb/HT3549, 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, https://lists.ntp.org/pipermail/announce/2009-January/000055.html, https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10035

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High