CVE-2009-0021
First published: Wed Jan 07 2009(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| NTP ntp | <=4.2.4p4 | |
| NTP ntp | =4.2.0 | |
| NTP ntp | =4.2.2 | |
| NTP ntp | =4.2.4p1 | |
| NTP ntp | =4.2.4p2 | |
| NTP ntp | =4.2.4p3 |
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Reference Links
- 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/oval%3Aorg.mitre.oval%3Adef%3A10035
Frequently Asked Questions
What is the severity of CVE-2009-0021?
CVE-2009-0021 is classified as a high-severity vulnerability due to its potential to allow certificate chain validation bypass.
How do I fix CVE-2009-0021?
To fix CVE-2009-0021, upgrade to NTP version 4.2.4p5 or later, or 4.2.5p150 or later.
Which versions of NTP are affected by CVE-2009-0021?
CVE-2009-0021 affects NTP versions prior to 4.2.4p5 and 4.2.5 versions before 4.2.5p150.
What exploitation methods are possible with CVE-2009-0021?
Exploitation of CVE-2009-0021 could allow remote attackers to bypass SSL/TLS certificate validation by using malformed signatures.
What protocols are impacted by CVE-2009-0021?
CVE-2009-0021 specifically affects the DSA and ECDSA keys used in SSL/TLS communications.
- collector/nvd-index
- collector/nvd-historical
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/severity
- agent/weakness
- agent/author
- agent/last-modified-date
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- vendor/ntp
- canonical/ntp ntp
- version/ntp ntp/4.2.4p4
- version/ntp ntp/4.2.0
- version/ntp ntp/4.2.2
- version/ntp ntp/4.2.4p1
- version/ntp ntp/4.2.4p2
- version/ntp ntp/4.2.4p3